BQ2060ADBQR应用文章市场行情现货热卖使用介绍供应商报价-中国IC网-芯三七

bq2060

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SLUS035E–JANUARY 2000–REVISED OCTOBER 2005

SBS V1.1-COMPLIANT GAS GAUGE IC

current, and remaining run-time predictions. The

bq2060 provides LED drivers and a push-button input

to depict remaining battery capacity from full to empty

in 20% or 25% increments with a 4- or 5-segment

display.

FEATURES

•

Provides Accurate Measurement of Available

Charge in NiCd, NiMH, Li-Ion, and Lead-Acid

Batteries

•

Supports SBS Smart Battery Data

Specification v1.1

The bq2060 works with an external EEPROM. The

EEPROM stores the configuration information for the

Supports the 2-Wire SMBus v1.1 Interface

with PEC or 1-Wire HDQ16

bq2060, such as

the battery’s chemistry,

self-discharge rate, rate compensation factors,

measurement calibration, and design voltage and

capacity. The bq2060 uses the programmable

self-discharge rate and other compensation factors

stored in the EEPROM to accurately adjust remaining

capacity for use and standby conditions based on

time, rate, and temperature. The bq2060 also

automatically calibrates or learns the true battery

capacity in the course of a discharge cycle from near

full to near empty levels.

•

Reports Individual Cell Voltages

Monitors and Provides Control to Charge and

Discharge FETs in Li-Ion Protection Circuit

•

Provides 15-Bit Resolution for Voltage,

Temperature, and Current Measurements

Measures Charge Flow Using a V-to-F

Converter with Offset of Less Than 16 µV

After Calibration

The REG output regulates the operating voltage for

the bq2060 from the battery cell stack using an

external JFET.

•

Consumes Less Than 0.5 mW Operating

Drives a 4- or 5-Segment LED Display for

Remaining Capacity Indication

•

28-Pin 150-mil SSOP

PIN CONNECTIONS

DESCRIPTION

1

28

27

26

25

24

23

22

21

20

19

18

17

16

15

HDQ16

ESCL

ESDA

RBI

SMBC

SMBD

VCELL

2

The bq2060 SBS-compliant gas gauge IC for battery

pack or in-system installation maintains an accurate

record of available charge in rechargeable batteries.

The bq2060 monitors capacity and other critical

battery parameters for NiCd, NiMH, Li-ion, and

lead-acid chemistries. The bq2060 uses a V-to-F

converter with automatic offset error correction for

charge and discharge counting. For voltage,

temperature, and current reporting, the bq2060 uses

an A-to-D converter. The onboard ADC also monitors

individual cell voltages in a Li-ion battery pack and

allows the bq2060 to generate control signals that

may be used with a pack supervisor to enhance pack

safety.

3

4

3

2

1

4

5

REG

6

V

OUT

7

V

CC

SR

1

8

V

SS

SR

2

9

DISP

SRC

TS

THON

CVON

CFC

DFC

10

11

12

13

14

LED

1

LED

2

LED

3

LED

4

LED

5

28-pin 150-mil SSOP

The bq2060 supports the smart battery data (SBData)

commands

and

charge-control

functions.

It

These devices have limited built-in ESD

protection. The leads should be shorted

together or the device placed in conductive

foam during storage or handling to prevent

electrostatic damage to the MOS gates.

communicates data using the system management

bus (SMBus) 2-wire protocol or the Benchmarq 1-wire

HDQ16 protocol. The data available include the

battery’s remaining capacity, temperature, voltage,

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

bq2060

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SLUS035E–JANUARY 2000–REVISED OCTOBER 2005

PIN DESCRIPTIONS

TERMINAL

DESCRIPTION

NAME

NO.

Serial communication input/output. Open-drain bidirectional communications

port

HDQ16

1

Serial memory clock. Output to clock the data transfer between the bq2060

and the external nonvolatile configuration memory

ESCL

ESDA

2

3

Serial memory data and address. Bidirectional pin used to transfer address

and data to and from the bq2060 and the external nonvolatile configuration

memory

Register backup input. Input that provides backup potential to the bq2060

registers during periods of low operating voltage. RBI accepts a storage

capacitor or a battery input.

RBI

4

Regulator output. Output to control an n-JFET for V_CCregulation to the

bq2060 from the battery potential

REG

V_OUT

5

6

Supply output. Output that supplies power to the external EEPROM

configuration memory

V_CC

V_SS

7

8

9

Supply voltage input

Ground.

DISP

Display control input. Input that controls the LED drivers LED1–LED5

10,11,12,

13,14

LED₁-LED₅

DFC

LED display segment outputs. Outputs that each may drive an external LED

Discharge FET control output. Output to control the discharge FET in the

Li-ion pack protection circuitry

15

16

Charge FET controll output. Output to control the charge FET in the Li-ion

pack protection circuitry

CFC

Cell voltage divider controll output. Output control for external FETs to

connect the cells to the external voltage dividers during cell voltage

measurements

CVON

THON

17

18

Thermistor bias control output. Output control for external FETs to connect

the thermistor bias resistor during a temperature measurement

Thermistor voltage input. Input connection for a thermistor to monitor

temperature

TS

19

20

SRC

Current sense input. Input to monitor instantaneous current

Charge-flow sense resistor inputs. Input connections for a small value sense

resistor to monitor the battery charge and discharge current flow

SR₁-SR₂

21,22

VCELL₁-

VCELL₄

23,24,25,2 Single-cell voltage inputs. Inputs that monitor the series element cell

6

voltages

SMBus data. Open-drain bidirectional pin used to transfer address and data

to and from the bq2060

SMBD

SMBC

27

SMBus clock. Open-drain bidirectional pin used to clock the data transfer to

and from the bq2060

28

ORDERING INFORMATION

For the most current package and ordering information, see the Package Option Addendum at the end of this

document, or see the TI Web site at www.ti.com.

2

bq2060

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SLUS035E–JANUARY 2000–REVISED OCTOBER 2005

ABSOLUTE MAXIMUM RATINGS⁽¹⁾

SYMBOL

PARAMETER

MIN

–0.3

–20

–40

MAX

+6

UNIT

V

NOTES

V_CC–Supply voltage

Relative to V_SS

V_IN–All other pins

+6

V

T_OPR

T_J

Operating temperature

Junction temperature

+70

+125

°C

Commercial

(1) Permanent device damage may occur if absolute maximum ratings are exceeded. Functional operation should be limited to the

Recommended DC Operating Conditions detailed in this data sheet.

DC ELECTRICAL CHARACTERISTICS

(V_CC= 2.7 V to 3.7 V, T_OPR= –20°C to 70°C, unless otherwise noted)

SYMBOL

V_CC

PARAMETER

TEST CONDITIONS

MIN

TYP

3.3

180

5

MAX UNIT

Supply voltage

2.7

3.7

235

10

V

I_CC

Operating current

V_OUTinactive

µ A

I_SLP

Low-power storage mode current

V_OUTleakage current

1.5 V < V_CC< 3.7 V

V_OUTinactive

I_LVOUT

– 0.2

– 5

0.2

V_OUTactive,

V_OUT= V_CC– 0.6 V

I_VOUT

V_OLS

V_OUTsource current

mA

Output voltage low: LED₁–LED₅, CFC, DFC

Output voltage low: THON, CVON

Input voltage low DISP

I_OLS= 5 mA

0.4

0.36

V

V_IL

V_IH

–0.3

2

0.8

Input voltage high DISP

V_CC+ 0.3

Output voltage low SMBC, SMBD, HDQ16,

ESCL, ESDA

V_OL

V_ILS

V_IHS

I_OL= 1 mA

0.4

0.8

6

V

Input voltage low SMBC, SMBD, HDQ16,

ESCL, ESDA

– 0.3

Input voltage high SMBC, SMBD, HDQ16,

ESCL, ESDA

1.7

V_AI

Input voltage range VCELL_1–4, TS, SRC

RBI data-retention input current

RBI data-retention voltage

V_SS– 0.3

1.25

50

V

nA

V

I_RB

V_RBI> 3 V, V_CC< 2.0 V

10

V_RBI

Z_AI1

Z_AI2

1.3

10

5

Input impedance: SR1, SR2

0–1.25 V

MΩ

Input impedance: VCELL_1–4, TS, SRC

VFC CHARACTERISTICS

(V_CC= 3.1 to 3.6 V, T_OPR= –0°C to 70°C, Unless Otherwise Noted

SYMBOL

V_SR

PARMETER

TEST CONDITIONS

V_SR= V_SR2– V_SR1

V_SR2= V_SR1

MIN

TYP

MAX UNIT

Input voltagerange,V_SR2and V_SR1

– 0.25

–250

–16

+0.25

V

,

V_SROS

V_SRinput offset

–50

0.8

250

µV

autocorrection disabled

V_SRCOS

RM_VCO

Calibrated offset

Supply voltage gain coefficient⁽¹⁾

+16

1.2

µ V

V_CC= 3.3 V

%/V

Slope for T_OPR= –20°C to 70°C

Total deviation T_OPR= –20°C to 70°C

Slope for T_OPR= –0°C to 50°C

Total deviation T_OPR= –0°C to 50°C

T_OPR= 0°C –50°C

– 0.09

–1.6%

–0.05

+0.09 % /°C

0.1%

RM_TCO

INL

Temperature gain coefficient⁽¹⁾

+0.05 % /°C

0.1%

–0.6%

Integral nonlinearity error

0.21%

(1) RM_TCOtotal deviation is from the nominal gain at 25°C.

3

bq2060

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SLUS035E–JANUARY 2000–REVISED OCTOBER 2005

REG CHARACTERISTICS

(T_OPR= –20°C to 70°C)

SYMBOL

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX UNIT

Normal Mode: REG controlled

output voltage

3.1

3.3

3.6

V

JFET: R_ds(on) < 150 Ω

V_gs(off) < –3 V at 10 µA

V_RO

Sleep Mode: REG controlled

output voltage

4.1

I_REG

REG output current

1

µ A

SMBus AC SPECIFICATIONS

V_CC= 2.7 V to 3.7 V, T_OPR= –20°C to 70°C, unless otherwise noted

SYMBOL

PARAMETER

TEST CONDITIONS

MIN TYP

MAX

100

UNIT

f_SMB

SMBus operating frequency

Slave mode, SMBC 50% duty cycle

10

kHz

Master mode, no clock low slave

extend

f_MAS

SMBus master clock frequency

51.2

kHz

t_BUF

Bus free time between start and stop

Hold time after (repeated) start

Repeated start setup time

Stop setup time

4.7

4

µs

µ s

ns

t_HD:STA

t_SU:STA

t_SU:STO

4.7

4

Receive mode

Transmit mode

0

t_HD:DAT

Data hold time

300

250

25

4.7

4

ns

t_SU:DAT

t_TIMEOUT

t_LOW

Data setup time

ns

(1)

Error signal/detect

See

35

ms

µ s

µs

Clock low period

(2)

t_HIGH

Clock high period

See

50

25

10

(3)

t_LOW:SEXT

t_LOW:MEXT

Cumulative clock low slave extend time

Cumulative clock low master extend time

See

ms

(4)

See

(1) The bq2060 times out when any clock low exceeds t_TIMEOUT

.

(2) t_{HIGH Max}is minimum bus idle time. SMBC = SMBD = 1 for t > 50 ms causes reset of any transaction involving bq2060 that is in

progress.

(3) t_LOW:SEXTis the cumulative time a slave device is allowed to extend the clock cycles in one message from initial start to the stop. The

bq2060 typically extends the clock only 20 ms as a slave in the read byte or write byte protocol.

(4) t_LOW:MEXTis the cumulative time a master device is allowed to extend the clock cycles in one message from initial start to the stop. The

bq2060 typically extends the clock only 20 ms as a master in the read byte or write byte protocol.

HDQ16 AC SPECIFICATIONS ()

V_CC= 2.7 V to 3.7 V, T_OPR= –20°C to 70°C, unless otherwise noted

SYMBOL

t_CYCH

t_CYCB

t_STRH

t_STRB

t_DSU

PARAMETER

Cycle time, host to bq2060 (write)

Cycle time, bq2060 to host (read)

Start hold time, host to bq2060 (write)

Start hold time, host to bq2060 (read)

Data setup time

TEST CONDITIONS

MIN

190

5

TYP

MAX

UNIT

µ s

ns

205

250

-

32

-

µ s

50

-

t_DSUB

t_DH

Data setup time

-

Data hold time

100

80

-

t_DV

Data valid time

-

t_SSU

Stop setup time

145

320

-

t_SSUB

t_RSPS

t_]

Stop setup time

-

Response time, bq2060 to host

Break time

190

40

t_BR

Break recovery time

-

4

bq2060

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SLUS035E–JANUARY 2000–REVISED OCTOBER 2005

Figure 1. SMBus Timing Data

t

BR

B

TD201803.eps

Figure 2. HDQ16 Break Timing

Write ”1”

Write ”0”

t

STRH

t

DSU

t

DH

t

SSU

t

CYCH

Figure 3. HDQ16 Host to bq2060

Read ”1”

Read ”0”

t

STRB

DSUB

t

DV

t

SSUB

t

CYCB

Figure 4. HDQ16 bq2060 to Host

FUNCTIONAL DESCRIPTION

GENERAL OPERATION

The bq2060 determines battery capacity by monitoring the amount of charge input to or removed from a

rechargeable battery. In addition to measuring charge and discharge, the bq2060 measures battery voltage,

temperature, and current, estimates battery self-discharge, and monitors the battery for low-voltage thresholds.

The bq2060 measures charge and discharge activity by monitoring the voltage across a small-value series sense

resistor between the battery’s negative terminal and the negative terminal of the battery pack. The available

battery charge is determined by monitoring this voltage and correcting the measurement for environmental and

operating conditions.

Figure 5 shows a typical bq2060-based battery pack application. The circuit consists of the LED display, voltage

and temperature measurement networks, EEPROM connections, a serial port, and the sense resistor. The

EEPROM stores basic battery pack configuration information and measurement calibration values. The EEPROM

must be programmed properly for bq2060 operation. Table 10 shows the EEPROM memory map and outlines

the programmable functions available in the bq2060.

5

bq2060

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SLUS035E–JANUARY 2000–REVISED OCTOBER 2005

FUNCTIONAL DESCRIPTION (continued)

The bq2060 accepts an NTC thermistor (Semitec 103AT) for temperature measurement. The bq2060 uses the

thermistor temperature to monitor battery pack temperature, detect a battery full charge condition, and

compensate for self-discharge and charge/discharge battery efficiencies.

MEASUREMENTS

The bq2060 uses a fully differential, dynamically balanced voltage-to-frequency converter (VFC) for charge

measurement and a sigma delta analog-to-digital converter (ADC) for battery voltage, current, and temperature

measurement.

Voltage, current, and temperature measurements are made every 2 to 2.5 seconds, depending on the bq2060

operating mode. Maximum times occur with compensated EDV, mWh mode, and maximum allowable discharge

rate. Any AtRate computations requested or scheduled (every 20 seconds) may add up to 0.5 second to the time

interval.

Charge And Discharge Counting

The VFC measures the charge and discharge flow of the battery by monitoring a small-value sense resistor

between the SR₁and SR₂pins as shown in Figure 5. The VFC measures bipolar signals up to 250 mV. The

bq2060 detects charge activity when V_SR= V_SR2– V_SR1is positive and discharge activity when V_SR= V_SR2–V_SR1

is negative. The bq2060 continuously integrates the signal over time using an internal counter. The fundamental

rate of the counter is 6.25 µVh.

Offset Calibration

The bq2060 provides an auto-calibration feature to cancel the voltage offset error across SR₁and SR₂for

maximum charge measurement accuracy. The calibration routine is initiated by issuing a command to

ManufacturerAccess(). The bq2060 is capable of automatic offset calibration down to 6.25 µV. Offset

cancellation resolution is less than 1 µV.

Digital Filter

The bq2060 does not measure charge or discharge counts below the digital filter threshold. The digital filter

threshold is programmed in the EEPROM and should be set sufficiently high to prevent false signal detection

with no charge or discharge flowing through the sense resistor.

Voltage

While monitoring SR₁and SR₂for charge and discharge currents, the bq2060 monitors the battery-pack potential

and the individual cell voltages through the VCELL₁–VCELL₄pins. The bq2060 measures the pack voltage and

reports the result in the Voltage() register. The bq2060 can also measure the voltage of up to four series

elements in a battery pack. The individual cell voltages are stored in the optional Manufacturer Function area.

The VCELL₁–VCELL₄inputs are divided down from the cells using precision resistors, as shown in Figure 5. The

maximum input for VCELL₁–VCELL₄is 1.25 V with respect to VSS. The voltage dividers for the inputs must be

set so that the voltages at the inputs do not exceed the 1.25 V limit under all operating conditions. Also, the

divider ratios on VCELL₁–VCELL₂must be half of that of VCELL₃–VCELL₄. To reduce current consumption from

the battery, the CVON output may used to connect the divider to the cells only during measurement period.

CVON is high impedance for 250 ms (12.5% duty cycle) when the cells are measured, and driven low otherwise.

See Table 1.

Current

The SRC input of the bq2060 measures battery charge and discharge current. The SRC ADC input converts the

current signal from the series sense resistor and stores the result in Current(). The full-scale input range to SBC

is limited to ±250 mV as shown in Table 2.

6

bq2060

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SLUS035E–JANUARY 2000–REVISED OCTOBER 2005

FUNCTIONAL DESCRIPTION (continued)

V

CC

bq2060

LED1

LED2

LED3

LED4

LED5

CFC

REG

V

CC

SST113

PACK+

CVON

VCELL

4

VCELL

3

VCELL

2

To Pack

Protection

Circuitry

V

CC

DFC

VCELL

1

DISP

RBI

EEPROM

A0

A1

A2

WP

V

SRC

CC

OUT

SCL

SDA

ESCL

ESDA

THON

SR

2

R

5

V

SS

1

V

CC

PACK−

SMBC

TS

SMBD

HDQ

Thermistor

V

SS

HDQ16

Figure 5. Battery Pack Application Diagram–LED Display and Series Cell Monitoring

7

bq2060

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SLUS035E–JANUARY 2000–REVISED OCTOBER 2005

Table 1. Example VCELL1–VCELL4 Divider and Input Range

VOLTAGE INPUT

VOLTAGE DIVISION RATIO

FULL-SCALE INPUT

(V)

VCELL₄

VCELL₃

VCELL₂

VCELL₁

16

8

20

10

8

Table 2. SRC Input Range

SENSE RESISTOR (Ω)

FULL-SCALE INPUT

(A)

±12.5

±8.3

±5.0

±2.5

0.02

0.03

0.05

0.10

Temperature

The TS input of the bq2060 with an NTC thermistor measures the battery temperature as shown in Figure 5. The

bq2060 reports temperature in Temperature(). THON may be used to connect the bias source to the thermistor

when the bq2060 samples the TS input. THON is high impedance for 60 ms when the temperature is measured,

and driven low otherwise.

GAS GAUGE OPERATION

General

The operational overview in Figure 6 illustrates the gas gauge operation of the bq2060. Table 3 describes the

bq2060 registers.

The bq2060 accumulates a measure of charge and discharge currents and estimates self-discharge of the

battery. The bq2060 compensates the charge current measurement for temperature and state-of-charge of the

battery. The bq2060 also adjusts the self-discharge estimation based on temperature.

Figure 6. bq2060 Operational Overview

8

bq2060

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SLUS035E–JANUARY 2000–REVISED OCTOBER 2005

The main counter RemainingCapacity() (RM) represents the available capacity or energy in the battery at any

given time. The bq2060 adjusts RM for charge, self-discharge, and leakage compensation factors. The

information in the RM register is accessible through the communications ports and is also represented through

the LED display.

The FullChargeCapacity() (FCC) register represents the last measured full discharge of the battery. It is used for

the battery’s full-charge reference for relative capacity indication. The bq2060 updates FCC when the battery

undergoes a qualified discharge from nearly full to a low battery level. FCC is accessible through the serial

communications ports.

The Discharge Count Register (DCR) is a non-accessible register that only tracks discharge of the battery. The

bq2060 uses the DCR register to update the FCC register if the battery undergoes a qualified discharge from

nearly full to a low battery level. In this way, the bq2060 learns the true discharge capacity of the battery under

system-use conditions.

Main Gas Gauge Registers

RemainingCapacity() (RM)

RM represents the remaining capacity in the battery. The bq2060 computes RM in either mAh or 10 mWh

depending on the selected mode.

On initialization, the bq2060 sets RM to 0. RM counts up during charge to a maximum value of FCC and down

during discharge and self-discharge to 0. In addition to charge and self-discharge compensation, the bq2060

calibrates RM at three low-battery-voltage thresholds, EDV2, EDV1, and EDV0 and three programmable

midrange thresholds VOC25, VOC50, and VOC75. This provides a voltage-based calibration to the RM counter.

DesignCapacity() (DC)

The DC is the user-specified battery full capacity. It is calculated from Pack Capacity EE 0x3a–0x3b and is

represented in mAh or 10 mWh. It also represents the full-battery reference for the absolute display mode.

FullChargeCapacity() (FCC)

FCC is the last measured discharge capacity of the battery. It is represented in either mAh or 10 mWh depending

on the selected mode. On initialization, the bq2060 sets FCC to the value stored in Last Measured Discharge EE

0x38–0x39. During subsequent discharges, the bq2060 updates FCC with the last measured discharge capacity

of the battery. The last measured discharge of the battery is based on the value in the DCR register after a

qualified discharge occurs. Once updated, the bq2060 writes the new FCC value to EEPROM in mAh to Last

Measured Discharge. FCC represents the full-battery reference for the relative display mode and relative state of

charge calculations.

Discharge Count Register (DCR)

The DCR register counts up during discharge, independent of RM. DCR can continue to count even after RM

has counted down to 0. Prior to RM = 0, discharge activity, light discharge estimation and self-discharge

increment DCR. After RM = 0, only discharge activity increments DCR. The bq2060 initializes DCR to FCC – RM

when RM is within twice the programmed value in Near Full EE 0x55. The DCR initial value of FCC – RM is

reduced by FCC/128 if SC = 0 (bit 2 in Control Mode) and is not reduced if SC = 1. DCR stops counting when

the battery voltage reaches the EDV2 threshold on discharge.

Capacity Learning (FCC Update) And Qualified Discharge

The bq2060 updates FCC with an amount based on the value in DCR if a qualified discharge occurs. The new

value for FCC equals the DCR value plus the programmable nearly full- and low-battery levels, according to the

following equation:

FCC(new) + DCR(final) +

DCR(initial) ) measureddischarge to EDV2

) (FCCxBatteryLow%)

(1)

9

where:

BatteryLow% = (value stored in EE 0x54) ÷ 2.56

bq2060

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SLUS035E–JANUARY 2000–REVISED OCTOBER 2005

A qualified discharge occurs if the battery discharges from RM ≥ FCC –Near Full * 2 to the EDV2 voltage

threshold with the following conditions:

•

No valid charge activity occurs during the discharge period. A valid charge is defined as an input 10 mAh into

the battery.

No more than 256 mAh of self-discharge and/or light discharge estimation occurs during the discharge

period.

•

The temperature does not drop below 5°C during the discharge period.

The battery voltage reaches the EDV2 threshold during the discharge period and the voltage was less than

the EDV2 threshold minus 256 mV when bq2060 detected EDV2.

•

No midrange voltage correction occurs during the discharge period.

FCC cannot be reduced by more than 256 mAh or increased by more than 512 mAh during any single update

cycle. The bq2060 saves the new FCC value to the EEPROM within 4 s of being updated.

Table 3. bq2060 Register Functions

COMMAND CODE

FUNCTION

SMBus ACCESS

UNITS

SMBus

0x00

0x01

0x02

0x03

0x04

0x05

0x06

0x07

0x08

0x09

0x0a

0x0b

0X0c

0x0d

0x0e

0x0f

HDQ16

0x00

ManufacturerAccess

RemainingCapacityAlarm

RemainingTimeAlarm

BatteryMode

read/write

read

n/a

mAh, 10 mWh

minutes

n/a

0x01

0x02

0x03

AtRate

0x04

mAh, 10 mWh

minutes

Boolean

0.1°K

AtRateTimeToFull

AtRateTimeToEmpty

AtRateOK

0x05

0x06

read

0x07

read

Temperature

0x08

read

Voltage

0x09

read

mV

Current

0x0a

read

mA

AverageCurrent

MaxError

0x0b

read

mA

0X0c

read

percent

mAh, 10 mWh

minutes

mA

RelativeStateOfCharge

AbsoluteStateOfCharge

RemainingCapacity

FullChargeCapacity

RunTimeToEmpty

AverageTimeToEmpty

AverageTimeToFull

ChargingCurrent

ChargingVoltage

Battery Status

0x0d

read

0x0e

read

0x0f

read

0x10

0x11

0x12

0x13

0x14

0x15

0x16

0x17

0x18

0x19

0x1a

0x1b

0x1c

0x1d-0x1f

0x20

0x21

0x22

0x23

0x10

read

0x11

read

0x12

read

0x13

read

0x14

read

0x15

read

mV

0x16

read

n/a

CycleCount

0x17

read

cycles

mAh, 10 mWh

mV

DesignCapacity

DesignVoltage

0x18

read

0x19

read

SpecificationInfo

ManufactureDate

SerialNumber

0x1a

read

n/a

0x1b

read

n/a

0x1c

read

Integer

-

Reserved

0x1d-0x1f

0x20-0x25

0x28-0x2b

0x30-0x32

0x38-0x3b

-

ManufacturerName

DeviceName

read

string

read

string

DeviceChemistry

ManufacturerData

read

string

read

string

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Table 3. bq2060 Register Functions (continued)

COMMAND CODE

FUNCTION

SMBus ACCESS

UNITS

SMBus

HDQ16

0x2f (LSB)

0x2f (MSB)

0x3c

Pack Status

Pack Configuration

VCELL4

0x2f (LSB)

0x2f (MSB)

0x3c

read/write

n/a

mV

VCELL3

0x3d

VCELL2

0x3e

VCELL1

0x3f

Table 4. State of Charge Based on Low Battery Voltage

THRESHOLD

EDV0

STATE OF CHARGE IN RM

0%

3%

EDV1

EDV2

Battery Low %

End-of-Discharge Thresholds And Capacity Correction

The bq2060 monitors the battery for three low-voltage thresholds, EDV0, EDV1, and EDV2. The EDV thresholds

are programmed in EDVF/EDV0 EE 0x72–0x73, EMF/EDV1 EE 0x74–0x75, and EDV C1/C0 Factor/ EDV2 EE

0x78–0x79. If the CEDV bit in Pack Configuration is set, automatic EDV compensation is enabled and the

bq2060 computes the EDV0, EDV1, and EDV2 thresholds based on the values in EE 0x72–0x7d, 0x06, and the

battery’s current discharge rate, temperature, capacity, and cycle count. The bq2060 disables EDV detection if

Current() exceeds the Overload Current threshold programmed in EE 0x46 - EE 0x47. The bq2060 resumes

EDV threshold detection after Current() drops below the overload current threshold. Any EDV threshold detected

is reset after a 10-mAh charge is applied.

The bq2060 uses the thresholds to apply voltage-based corrections to the RM register according to Table 4.

The bq2060 adjusts RM as it detects each threshold. If the voltage threshold is reached before the corresponding

capacity on discharge, the bq2060 reduces RM to the appropriate amount as shown in Table 4. If RM reaches

the capacity level before the voltage threshold is reached on discharge, the bq2060 prevents RM from

decreasing until the battery voltage reaches the corresponding threshold.

Self-Discharge

The bq2060 estimates the self-discharge of the battery to maintain an accurate measure of the battery capacity

during periods of inactivity. The algorithm for self-discharge estimation takes a programmed estimate for the

expected self-discharge rate at 25°C stored in EEPROM and makes a fixed reduction to RM of an amount equal

to RemainingCapacity()/256. The bq2060 makes the fixed reduction at a varying time interval that is adjusted to

achieve the desired self-discharge rate. This method maintains a constant granularity of 0.39% for each

self-discharge adjustment, which may be performed multiple times per day, instead of once per day with a

potentially large reduction.

The self-discharge estimation rate for 25°C is doubled for each 10 degrees above 25°C or halved for each 10

degrees below 25°C. The following table shows the relation of the self-discharge estimation at a given

temperature to the rate programmed for 25°C (Y% per day):

TEMPERATURE (C)

Temp < 10

SELF-DISCHARGE RATE

¼Y% per day

½Y% per day

Y% per day

10 ≤ Temp <20

20 ≤ Temp <30

30 ≤ Temp <40

40 ≤ Temp <50

50 ≤ Temp <60

60 ≤ Temp <70

70 ≤ Temp

2Y% per day

4Y% per day

8Y% per day

16Y% per day

32Y% per day

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The interval at which RM is reduced is given by the following equation, where n is the appropriate factor of 2 n =

¼ , ½ , 1, 2, . . . ):

640 13500

256 n (Y% per day)

Self−DischargeUpdateTime +

seconds

(2)

The timer that keeps track of the self-discharge update time is halted whenever charge activity is detected. The

timer is reset to zero if the bq2060 reaches the RemainingCapacity()=FullChargeCapacity() condition while

charging.

Example: If T = 35°C (n = 2) and programmed self-discharge rate Y is 2.5 (2.5% per day at 25°C), the bq2060

reduces RM by RM/256 (0.39%) every

640 13500

256 n (Y% per day)

+ 6750 seconds

(3)

Figure 7. Self-Discharge at 2.5%/Day @25°C

This means that a 0.39% reduction of RM is made 12.8 times per day to achieve the desired 5% per day

reduction at 35°C.

Figure 7 illustrates how the self-discharge estimate algorithm adjusts RemainingCapacity() versus temperature.

Light Discharge Or Suspend Current Compensation

The bq2060 can be configured in two ways to compensate for small discharge currents that produce a signal

below the digital filter. First, the bq2060 can decrement RM and DCR at a rate determined by the value stored in

Light Discharge Current EE 0x2b when it detects no discharge activity and the SMBC and SMBD lines are high.

Light Discharge Current has a range of 44 µA to 11.2 mA.

Alternatively, the bq2060 can be configured to disable the digital filter for discharge when the SMBC and SMBD

lines are high. In this way, the digital filter does not mask the leakage current signal. The bq2060 is configured in

this mode by setting the NDF bit in Control Mode.

Midrange Capacity Corrections

The bq2060 applies midrange capacity corrections when the VCOR bit is set in Pack Configuration. The bq2060

adjusts RM to the associated percentage at three different voltage levels: VOC25, VOC50, and VOC75. The

VOC values represent the open-circuit battery voltage which RM corresponds to the associated state of charge

for each threshold.

THRESHOLD

VOC25

ASSOCIATED STATE OF CHARGE

25%

50%

75%

VOC50

VOC75

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For the midrange corrections to occur, the temperature must be in the range of 19°C to 31°C inclusive and the

Current() and AverageCurrent() must both be between –64 mA and 0. The bq2060 makes midrange corrections

as shown in Table 5.

Table 5. Midrange Corrections

CONDITION

RESULT

≥ VOC75 and RelativeStateOfCharge() ≤ 63%

< VOC75 and RelativeStateOfCharge() ≥ 87%

≥ VOC50 and RelativeStateOfCharge() ≤ 38%

< VOC50 and RelativeStateOfCharge() ≥ 62%

≥ VOC25 and RelativeStateOfCharge() ≤ 13%

< VOC25 and RelativeStateOfCharge() ≥ 37%

RelativeStateOfCharge() set to 75%

RelativeStateOfCharge() set to 50%

RelativeStateOfCharge() set to 25%

Voltage()

Charge Control

Charging Voltage and Current Broadcasts

The bq2060 supports SBS charge control by broadcasting the ChargingCurrent() and ChargingVoltage() to the

Smart Charger address. The bq2060 broadcasts the requests every 10 s. The bq2060 updates the values used

the charging current and voltage broadcasts based on the battery’s state of charge, voltage, and temperature.

The fast-charge rate is programmed in Fast-Charging Current EE 0x1a - 0x1b while the charge voltage is

programmed in Charging Voltage EE 0x0a-0x0b.

The bq2060 internal charge control is compatible with popular rechargeable chemistries. The primary

charge-termination techniques include a change in temperature over a change in time (∆T/∆t) and current taper,

for nickel-based and Li-ion chemistries, respectively. The bq2060 also provides pre-charge qualification and a

number of safety charge suspensions based on current, voltage, temperature, and state of charge.

Alarm Broadcasts to Smart Charger and Host

If any of the bits 8–15 in BatteryStatus() is set, the bq2060 broadcasts an AlarmWarning() message to the Host

address. If any of the bits 12–15 in BatteryStatus() are set, the bq2060 also sends an AlarmWarning() message

to the Smart Charger address. The bq2060 repeats the AlarmWarning() message every 10 s until the bits are

cleared.

Pre-Charge Qualification

The bq2060 sets ChargingCurrent() to the pre-charge rate as programmed in Pre-Charge Current EE 0x1e-0x1f

under the following conditions:

•

Voltage: The bq2060 requests the pre-charge charge rate when Voltage() drops below the EDV0 threshold

(compensated or fixed EDVs). Once requested, a pre-charge rate remains until Voltage() increases above

the EDVF threshold. The bq2060 also broadcasts the pre-charge value immediately after a device reset until

Voltage() is above the EDVF threshold. This threshold is programmed in EDVF/EDV0 EE 0x72-0x73.

•

Temperature: The bq2060 requests the pre-charge rate when Temperature() is between 0°C and 5°C.

Temperature() must rise above 5°C before the bq2060 requests the fast-charge rate.

Charge Suspension

The bq2060 may temporarily suspend charge if it detects a charging fault. A charging fault includes the following

conditions.

•

Overcurrent: An overcurrent condition exists when the bq2060 measures the charge current to be more than

the Overcurrent Margin above the ChargingCurrent(). Overcurrent Margin is programmed in EE 0x49. On

detecting an overcurrent condition, the bq2060 sets the ChargingCurrent() to zero and sets the

TERMINATE_CHARGE_ALARM bit in Battery Status(). The overcurrent condition and TERMINATE_

CHARGE_ALARM are cleared when the measured current drops below the ChargingCurrent plus the

Overcurrent Margin.

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•

Overvoltage: An overvoltage condition exists when the bq2060 measures the battery voltage to be more

than the Overvoltage Margin above the ChargingVoltage() or a Li-ion cell voltage has exceeded the

overvoltage limit programmed in Cell Under-/Overvoltage. Overvoltage Margin is programmed in EE 0x48

and Cell Under-/Overvoltage in EE 0x4a (least significant nibble). On detecting an overvoltage condition, the

bq2060 sets the ChargingCurrent() to zero and sets the TERMINATE_CHARGE_ALARM bit in

BatteryStatus(). The bq2060 clears the TERMINATE_ CHARGE_ALARM bit when it detects that the battery

is no longer being charged (DISCHARGING bit set in BatteryStatus()). The bq2060 continues to broadcast

zero charging current until the overvoltage condition is cleared. The overvoltage condition is cleared when

the measured battery voltage drops below the ChargingVoltage() plus the Overvoltage Margin or when the

CVOV bit is reset.

•

Over-Temperature: An over-temperature condition exists when Temperature() is greater than or equal to the

Max T value programmed in EE 0x45 (most significant nibble). On detecting an over-temperature condition,

the bq2060 sets the ChargingCurrent() to zero and sets the OVER_TEMP_ALARM and

TERMINATE_CHARGE_ ALARM bit in BatteryStatus() and the CVOV bit in Pack Status. The

over-temperature condition is cleared when Temperature() is equal to or below (Max T– 5°C).

Overcharge: An overcharge condition exists if the battery is charged more than the Maxmum Overcharge

value after RM = FCC. Maximum Overcharge is programmed in EE 0x2e–0x2f. On detecting an overcharge

condition, the bq2060 sets the ChargingCurrent() to zero and sets the OVER_CHARGED_ALARM,

TERMINATE_CHARGE_ ALARM, and FULLY_CHARGED bits in BatteryStatus(). The bq2060 clears the

OVER_ CHARGED_ALARM and TERMINATE_CHARGE_ ALARM when it detects that the battery is no

longer being charged. The FULLY_CHARGED bit remains set and the bq2060 continues to broadcast zero

charging current until RelativeStateOfCharge() is less than Fully Charged Clear% programmed in EE

0x4c.The counter used to track overcharge capacity is reset with 2mAh of discharge.

•

Under-Temperature: An under-temperature condition exists if Temperature() < 0°C. On detecting an

under-temperature condition, the bq2060 sets ChargingCurrent() to zero. The bq2060 sets ChargingCurrent()

to the appropriate pre-charge rate or fast-charge rate when Temperature() ≥ 0°C.

Primary Charge Termination

The bq2060 terminates charge if it detects a charge-termination condition. A charge-termination condition

includes the following.

•

∆T/∆t: For ∆T/∆t, the bq2060 detects a change in temperature over many seconds. The ∆T/∆t setting is

programmable in both the temperature step, DeltaT (1.6°C – 4.6°C), and the time step, DeltaT Time (20

s–320 s). Typical settings for 1°C/minute include 2°C/120 s and 3°C/180 s. Longer times are required for

increased slope resolution. The DeltaT value is programmed in EE 0x45 (least significant nibble) and the

Delta T Time in EE 0x4e.

In addition to the ∆T/∆t timer, a holdoff timer starts when the battery is being charged at more than 255 mA

and the temperature is above 25°C. Until this timer expires, ∆T/∆t detection is suspended. If Current() drops

below 256 mA or Temperature() below 25°C, the hold-off timer resets and restarts only when the current and

temperature conditions are met again. The holdoff timer is programmable (20 s–320 s) with Holdoff Time

value in EE 0x4f.

•

Current Taper: For current taper, ChargingVoltage() must be set to the pack voltage desired during the

constant-voltage phase of charging. The bq2060 detects a current taper termination when the pack voltage is

greater than the voltage determined by Current Taper Qual Voltage in EE 0x4f and the charging current is

below a threshold determined by Current Taper Threshold in EE 0x4e, for at least 40 s. The bq2060 uses the

VFC to measure current for current taper termination. The current polarity must remain positive as measured

by the VFC during this time.

Once the bq2060 detects a primary charge termination, the bq2060 sets the TERMINATE_CHARGE_ALARM

and FULLY_CHARGED bits in BatteryStatus(), and sets the ChargingCurrent() to the maintenance charge rate

as programmed in Maintenance Charging Current EE 0x1c–0x1d. On termination, the bq2060 also sets RM to a

programmed percentage of FCC, provided that RelativeStateOfCharge() is below the desired percentage of FCC

and the CSYNC bit in Pack Configuration EE 0x3f is set. If the CSYNC bit is not set and RelativeStateOfCharge()

is less than the programmed percentage of FCC, the bq2060 clears the FULLY_CHARGED bit in

BatteryStatus(). The programmed percentage of FCC, Fast Charge Termination %, is set in EE 0x4b. The

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bq2060 clears the FULLY_CHARGED bit when RelativeStateOfCharge() is less than the programmed Fully

Charged Clear %. The bq2060 broadcasts the fast-charge rate when the FULLY_CHARGED bit is cleared and

voltage and temperature permit. The bq2060 clears the TERMINATE_CHARGE_ALARM when it no longer

detects that the battery is being charged or it no longer detects the termination condition. See Table 6 for a

summary of BatteryStatus() alarm and status bit operation.

Display Port

General

The display port drives a 4- or 5-LED, bar-graph display. The display is activated by a logic signal on the DISP

input. The bq2060 can display RM in either a relative or absolute mode with each LED representing a

percentage of the full-battery reference. In relative mode, the bq2060 uses FCC as the full-battery reference; in

absolute mode, it uses DC.

The DMODE bit in Pack Configuration programs bq2060 for the absolute or relative display mode. The LED bit in

Control Mode programs the 4-or 5-LED option. A 5th LED can be used with the 4-LED display option to show

when the battery capacity is ≥ to 100%.

Activation

The display may be activated at any time by a high-to-low transition on the DISP input. This is usually

accomplished with a pullup resistor and a pushbutton switch. Detection of the transition activates the display and

starts a 4-s display timer. The timer expires and turns off the display whether DISP was brought low momentarily

or held low indefinitely. Reactivation of the display requires that the DISP input return to a logic-high state and

then transition low again. The second high-to-low transition must occur after the display timer expires. The

bq2060 requires the DISP input to remain stable for a minimum of 250ms to detect the logic state.

If the EDV0 bit is set, the bq2060 disables the LED display. The display is also disabled during a VFC calibration

and should be turned off before entering the low-power storage mode.

Display Modes

In relative mode, each LED output represents 20% or 25% of the RelativeStateOfCharge() value. In absolute

mode, each LED output represents 20% or 25% of the AbsoluteStateOfCharge() value. Table 7 shows the

display operation.

In either mode, the bq2060 blinks the LED display if RemainingCapacity() is less than Remaining

CapacityAlarm(). The display is disabled if EDV0 = 1.

Secondary Protection for Li-Ion

Undervoltage and overvoltage thresholds may be programmed in the byte value Cell Under/Over Voltage EE

0x4a to set a secondary level of protection for Lithium ion cells. The bq2060 checks individual cell voltages for

undervoltage and overvoltage conditions. The bq2060 displays the results in the Pack Status register and

controls the state of the FET control outputs CFC and DFC. any cell voltage is less than the V_UVthreshold, the

bq2060 sets the CVUV bit in Pack Status and pulls the DFC pin to a logic low. If any cell voltage is greater than

the V_OVthreshold, the bq2060 sets the CVOV bit in Pack Status and pulls the CFC pin to a logic low.

Low-Power Storage Mode

The bq2060 enters low-power mode 5 to 8 s after receiving the Enable Low-Power command. In this mode the

bq2060 consumes less than 10 µA. A rising edge on SMBC, SMBD, or HDQ16 restores the bq2060 to the full

operating mode. The bq2060 does not perform any gas gauge functions during low-power storage mode.

Device Reset

The bq2060 can be reset with commands over the HDQ16 or SMBus. On reset, the bq2060 initializes its internal

registers with the information contained in the configuration EEPROM. The following command sequence

initiates a full bq2060 reset:

Write 0x4f to 0xff5a

Write 0x7d to 0x0000

Write 0x7d to 0x0080

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Table 6. Alarm and Status Bit Summary⁽¹⁾

BATTERY STATE

CONDITIONS

CC() STATE AND

BatteryStatus BITS SET

CC() = FAST OR PRE-CHARGE CURRENT

AND/OR BITS CLEARED

Overcurrent

C() ≥ CC() +

CC() = 0, TCA = 1

C() < CC() + Overcurrent Margin

Overcurrent Margin

TCA = 1

DISCHARGING = 1

V() ≥ CV() + Overvoltage Margin

VCELL1, 2, 3, or 4 > Cell Over

Voltage

Overvoltage

CC() = 0, CVOV = 1

V() < CV() + Overvoltage Margin

Li-ion cell voltage ≤Cell Over Voltage

Over temperature

T() ≥Max T

CC() = 0, OTA= 1,

TCA = 1, CVOV = 1

T() ≤Max T - 5°C or T() ≤ 43°C

Capacity added after RM() = FCC()

CC() = 0, FC = 1

OCA = 1, TCA = 1

RSOC() < Fully Charged Cleared %

Overcharge

≥

DISCHARGING = 1

Maximum Overcharge

Under temperature

T() < 0°C

CC() = 0

0°C ≤ T() < 5°C, CC() = Pre-Charge Current

T() ≥ 5°C, CC() = Fast-Charging Current

CC() = Maintenance

Charging Current,

FC = 1

RSOC() < Fully Charged Cleared %

Fast charge termination

∆T/∆t or Current Taper

TCA = 1

DISCHARGING = 1 or termination condition is

no longer valid.

Fully discharged

Overdischarged

V() ≤ EDV2

V() ≤ EDV0

FD = 1

TDA = 1

RSOC() > 20%

V() > EDV0

VCELL1, 2, 3 or 4 < Cell Under

TDA = 1, CVUV = 1

VCELL1, 2, 3, or 4 ≥Cell Under Voltage

Voltage

Low capacity

Low run-time

RM() < RCA()

RCA = 1

RTA = 1

RM() ≥ RCA()

ATTE() < RTA()

ATTE() ≥ RTA()

(1) C() = Current(), CV() = ChargingVoltage(), CC() = ChargingCurrent(), V() = Voltage(), T() = Temperature(),

TCA = TERMINATE_CHARGE_ALARM, OTA = OVER_TEMPERATURE_ALARM,

OCA = OVER_CHARGED_ALARM, TDA = TERMINATE_DISCHARGE_ALARM, FC = FULLY_CHARGED,

FD = FULLY_DISCHARGED, RSOC() = RelativeStateOfCharge(). RM() = RemainingCapacity(),

RCA = REMAINING_CAPACITY_ALARM, RTA = REMAINING_TIME_ALARM,

ATTE() = AverageTimeToEmpty(), RTA() = RemainingTimeAlarm(), RCA() = RemainingCapacityAlarm(),

FCC() = FullChargeCapacity.

Table 7. DISPLAY MODE (5 LED)

CONDITION

RELATIVE OR

ABSOLUTE

STATEOFCHARGE

()

5 LED DISPLAY OPTION

LED1

LED2

LED3

LED4

LED5

EDV0 = 1

<20%

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

≥20%, <40%

≥40%, <60%

≥60%, <80%

≥80%

ON

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Table 8. DISPLAY MODE (4 LED)

CONDITION

RELATIVE OR

ABSOLUTE

4 LED DISPLAY OPTION

LED1

LED2

LED3

LED4

STATEOFCHARGE()

EDV0 = 1

<25%

OFF

ON

OFF

ON

OFF

ON

OFF

ON

≥25%, <50%

≥50%, <75%

≥75%

ON

Communication

The bq2060 includes two types of communication ports: SMBus and HDQ16. The SMBus interface is a 2-wire

bidirectional protocol using the SMBC (clock) and SMBD (data) pins. The HDQ16 interface is a 1-wire

bidirectional protocol using the HDQ16 pin. All three communication lines are isolated from V_CCand may be

pulled up higher than V_CC. Also, the bq2060 does not pull these lines low if V_CCto the part is zero. HDQ16

should be pulled down with a 100-kΩ resistor if not used.

The communication ports allow a host controller, an SMBus-compatible device, or other processor to access the

memory registers of the bq2060. In this way a system can efficiently monitor and manage the battery.

SMBus

The SMBus interface is a command-based protocol processor acting as the bus master initiates communication

to the bq2060 by generating a START condition. The START condition consists of a high-to-low transition of the

SMBD line while the SMBC is high. The processor then sends the bq2060 device address of 0001011 (bits 7–1)

plus a R/W bit (bit 0) followed by an SMBus command code. The R/W bit and the command code instruct the

bq2060 to either store the forthcoming data to a register specified by the SMBus command code or output the

data from the specified register. The processor completes the access with a STOP condition. A STOP condition

consists of a low-to-high transition of the SMBD line while the SMBC is high. With the SMBus protocol, the most

significant bit of a data byte is transmitted first.

In some instances, the bq2060 acts as the bus master. This occurs when the bq2060 broadcasts charging

requirements and alarm conditions to device addresses 0x12 (SBS Smart Charger) and 0x10 (SBS Host

Controller.)

SMBus Protocol

The bq2060 supports the following SMBus protocols:

•

Read Word

Write Word

Read Block

A processor acting as the bus master uses the three protocols to communicate with the bq2060. The bq2060

acting as the bus master uses the WriteWord protocol.

The SMBD and SMBC pins are open drain and require external pullup resistors.

SMBus Packet Error Checking

The bq2060 supports Packet Error Checking as a mechanism to confirm proper communication between it and

another SMBus device. Packet Error Checking requires that both the transmitter and receiver calculate a Packet

Error Code (PEC) for each communication message. The device that supplies the last byte in the communication

message appends the PEC to the message. The receiver compares the transmitted PEC to its PEC result to

determine if there is a communication error.

PEC Protocol

The bq2060 can receive or transmit data with or without PEC. Figure 8 shows the communication protocol for the

Read Word, Write Word, and Read Block messages without PEC. Figure 9 includes PEC.

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In the Write Word protocol, the bq2060 receives the PEC after the last byte of data from the host. If the host

does not support PEC, the last byte of data is followed by a STOP condition. After receipt of the PEC, the

bq2060 compares the value to its calculation. If the PEC is correct, the bq2060 responds with an

ACKNOWLEDGE. If is not correct, the bq2060 responds with a NOT ACKNOWLEDGE and sets an error code.

Figure 8. SMBus Communication Protocol Without PEC

Figure 9. SMBus Communication Protocol With PEC

In the Read Word and Block Read, the host generates an ACKNOWLEDGE after the last byte of data is sent by

the bq2060. The bq2060 then sends the PEC and the host acting as a master-receiver generates a NOT

ACKNOWLEDGE and a STOP condition.

PEC Calculation

The basis of the PEC calculation is an 8-bit cyclic redundancy check (CRC-8) based on the polynomial C(X) = X⁸

+ X²+ X¹+ 1. The PEC calculation includes all bytes in the transmission, including address, command, and data.

The PEC calculation does not include ACKNOWLEDGE, NOT ACKNOWLEDGE, START, STOP, and repeated

START bits.

For example, the host requests RemainingCapacity() from the bq2060. This includes the host following the Read

Word protocol. The bq2060 calculates the PEC based on the following 5 bytes of data, assuming that the

remaining capacity of the battery is 1001 mAh.

•

Battery Address with R/W = 0: 0x16

Command Code for RemainingCapacity(): 0x0f

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•

Battery Address with R/W = 1: 0x17

RemainingCapacity(): 0x03e9

For 0x160f17e903, the bq2060 transmits a PEC of 0xe8 to the host.

PEC Enable in Master Mode

PEC for master mode broadcasts to the charger, host, or both can be enabled/disabled with the combination the

bits HPE and CPE in Control Mode.

SMBus On and Off State

The bq2060 detects whether the SMBus enters the Off state by monitoring the SMBC and SMBD lines. When

both signals are continually low for at least 2.5 s, the bq2060 detects the Off state. When the SMBC and SMBD

lines go high, the bq2060 detects the On state and can begin communication within 1 ms. One-MΩ pulldown

resistors on SMBC and SMBD are recommended for reliable Off tate detection.

HDQ16

The HDQ16 interface is a command-based protocol. (See Figure 10.) A processor sends the command code to

the bq2060. The 8-bit command code consists of two fields, the 7-bit HDQ16 command code (bits 0–6) and the

1-bit R/W field. The R/W field directs the bq2060 either to

•

Store the next 16 bits of data to a specified register or

Output 16 bits of data from the specified register

With HDQ16, the least significant bit of a data byte (command) or word (data) is transmitted first.

A bit transmission consists of three distinct sections. The first section starts the transmission by either the host or

the bq2060 taking the HDQ16 pin to a logic-low state for a period t_STRH;B. The next section is the actual data

transmission, where the data bit is valid by the time, t_DSU;Bafter the negative edge used to start communication.

The data bit is held for a period t_DH;DVto allow the host processor or bq2060 to sample the data bit.

The final section is used to stop the transmission by returning the HDQ16 pin to a logic-high state by at least the

time t_SSU;Bafter the negative edge used to start communication. The final logic-high state should be until a period

t_CYCH;Bto allow time to ensure that the bit transmission was stopped properly.

If a communication error occurs (e.g., t_CYCB> 250µs), the host sends the bq2060 a BREAK to reinitiate the serial

interface. The bq2060 detects a BREAK when the HDQ16 pin is in a logic-low state for a time t_Bor greater. The

HDQ16 pin is then returned to its normal ready-high logic state for a time t_BR. The bq2060 is then ready to

receive a command from the host processor.

The HDQ16 pin is open drain and requires an external pullup resistor.

-

Figure 10. HDQ16 Communication Example

Command Codes

The SMBus Command Codes are in (), the HDQ16 in [ ]. Temperature(), Voltage(), Current(), and

AverageCurrent(), performance specifications are at regulated V_CC(V_RO) and a temperature of 0°C–70°C.

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ManufacturerAccess() (0x00); [0x00–0x01]

DESCRIPTION

This function provides writable command codes to control the bq2060 during normal operation and

pack manufacture. These commands can be ignored if sent within one second after a device reset.

The following list of commands are available.

0x0618 ENABLE LOW-POWER STORAGE MODE: Activates the low-power storage mode. The bq2060 enters

the storage mode after

a 5- to 8-s delay. The bq2060 accepts other commands to

ManufacturerAccess() during the delay before entering low-power storage mode. The LEDs must

be off before entering the low-power storage mode as the display state remains unchanged. During

the delay following the low-power storage command, a VFC Calibration command may be issued.

The bq2060 clears the ManufacturerAccess() command within 900 ms of acknowledging the Enable

Low-Power Storage command. The VFC Calibration command must be sent 900–1600 ms after

SMBus acknowledgment of the Enable Low-Power Storage command. In this case, the bq2060

delays entering storage mode until the calibration process completes and the bq2060 stores the

new calibration values in EEPROM.

0x062b SEAL COMMAND: Instructs the bq2060 to restrict access to those functions listed in Table 3.

NOTE:

The SEAL Command does not change the state of the SEAL bit in Pack Configuration

in EEPROM. The bq2060 completes the seal function and clears

ManufacturerAccess() within 900 ms of acknowledging the command.

0x064d CHARGE SYNCHRONIZATION: Instructs the bq2060 to update RM to a percentage of FCC as defined

in Fast Charge Termination %. The bq2060 updates RM and clears ManufacturerAccess() within

900 ms of acknowledging the command.

0x0653 ENABLE VFC CALIBRATION: Instructs the unsealed bq2060 to begin VFC calibration. With this

command, the bq2060 deselects the SR₁and SR₂inputs and calibrates for IC offset only. It is best

to avoid charge or discharge currents through the sense resistor during this calibration process.

0x067e ALTERNATE VFC CALIBRATION: Instructs the unsealed bq2060 to begin VFC calibration. With this

command, the bq2060 does not deselect the SR₁and SR₂inputs and calibrates for IC and PCB

offset. During this procedure no charge or discharge currents occur.

During VFC calibration, the bq2060 disables the LED display and accepts only the Stop VFC

Calibration and the SEAL Command to ManufacturerAccess(). The bq2060 disregards all other

commands. SMBus communication should be kept to a minimum during VFC calibration to reduce

the noise level and allow a more accurate calibration.

Once started, the VFC calibration procedure completes automatically. When complete, the bq2060

saves the calibration values in EEPROM. The calibration normally takes about 8 to 10 minutes. The

calibration time is inversely proportional to the bq2060 VFC (and PCB) offset error. The bq2060

caps the calibration time at one hour in the event of calibrating a zero-offset error. The VFC

calibration can be done as the last step in a battery pack test procedure because the calibration

can complete automatically after removal from a test setup.

The bq2060 clears ManufacturerAccess() within 900 ms and starts calibration within 3.2 s of

acknowledging the command.

0X0660 STOP VFC CALIBRATION: Instructs the bq2060 to abort a VFC calibration procedure. If aborted, the

bq2060 disables offset correction. The bq2060 stops calibration within 20 ms of acknowledging the

command.

0X0606 PROGRAM EEPROM: Instructs the unsealed bq2060 to connect the SMBus to the EEPROM I²C bus.

The bq2060 applies power to the EEPROM within 900 ms of acknowledging the command. After

issuing the program EEPROM command, the bq2060 monitoring functions are disabled until the I²C

bus is disconnected. The bq2060 disconnects the I²C bus when it detects that the Battery Address

0x16 is sent over the SMBus. The Battery Address 0x16 to disconnect the I²C bus should not be

sent until 10 ms after the last write to the EEPROM.

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Example: The following sequence of actions is an example of how to use the ManufacturerAccess() commands

in an efficient manner to take a battery pack that has completed all testing and calibration except for VFC

calibration and to make it ready for shipment in the SEALED state and in low-power storage mode:

1. Complete testing and calibration with desired final values stored in EEPROM. This process includes setting

the SEAL bit in Pack Configuration. Sending a reset command to the bq2060 during test ensures that RAM

values correspond to the final EEPROM values

2. If the initial value of RemainingCapacity() must be non-zero, the desired value may be written to Command

0x26 with the pack unsealed. A reset sent after this step resets RM to zero.

3. Issue the Enable Low-Power Storage Mode command.

4. Within 900–1600 ms after sending the Enable Low-Power command, issue the Enable VFC Calibration

command. This delays the low-power storage mode until after VFC calibration completion.

5. Issue the SEAL Command subsequent to the VFC Calibration command. The bq2060 must receive the

SEAL Command before VFC calibration completes. The bq2060 resets the OCE bit in Pack Status when

calibration begins and sets the bit when calibration successfully completes.

After VFC calibration completes automatically, the bq2060 saves the VFC offset cancellation values in EEPROM

and enters the low-power storage mode in about 20 s. In addition, the bq2060 is sealed, allowing access as

defined in Table 3 only.

PURPOSE

The ManufacturerAccess() function provides the system host access to bq2060 functions that are

not defined by the SBD.

SMBUS PROTOCOL Read or Write Word

INPUT/OUTPUT: Word

RemainingCapacityAlarm() (0x01); [0x01]

DESCRIPTION

Sets or gets the low-capacity threshold value. Whenever the RemainingCapacity() falls below the

low-capacity value, the bq2060 sends AlarmWarning() messages the SMBus Host with the

REMAINING_CAPACITY_ ALARM bit set. A low-capacity value of 0 disables this alarm. The

bq2060 initially sets the low-capacity value to Remaining Capacity Alarm value programmed in EE

0x04

-

0x05. The low-capacity value remains unchanged until altered by the

Remaining-CapacityAlarm() function. The low-capacity value may be expressed in either current

(mA) or power (10 mWh) depending on the setting of the BatteryMode()’s CAPACITY_ MODE bit.

PURPOSE

The RemainingCapacityAlarm() function can be used by systems that know how much power they

require to save their operating state. It enables those systems to more finely control the point at

which they transition into suspend or hibernate state. The low-capacity value can read to verify the

value in use by the bq2060’s low capacity alarm.

SMBus PROTOCOL Read or Write Word

INPUT/OUTPUT Unsigned integer—value below which Low Capacity messages are sent.

BATTERY MODES

CAPACITY_MODE

bit = 0

CAPACITY_MODE

bit = 1

Units

Range

mAh @ C/5

10 mWh @ P/5

0–65,535 mAh

0–65,535 10 mWh

Granularity

Accuracy

Not applicable

See RemainingCapacity()

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RemainingTimeAlarm() (0x02); [0x02]

DESCRIPTION

Sets or gets the remaining time alarm value. Whenever the AverageTimeToEmpty() falls below the

remaining time value, the bq2060 sends AlarmWarning() messages to the SMBus Host with the

REMAINING_TIME_ALARM bit set. A remaining time value of 0 effectively disables this alarm. The

bq2060 initially sets the remaining time value to the Remaining Time Alarm value programmed in

EE 0x02

- 0x03. The remaining time value remains unchanged until altered by the

RemainingTimeAlarm() function.

PURPOSE

The RemainingTimeAlarm() function can be used by systems that want to adjust when the

remaining time alarm warning is sent. The remaining time value can be read to verify the value in

use by the bq2060’ RemainingTimeAlarm().

SMBus PROTOCOL Read or Write Word

INPUT/OUTPUT:

Unsigned integer—the point below which remaining time messages are sent.

Units: minutes

Range: 0 to 65,535 minutes

Granularity: Not applicable

Accuracy: see AverageTimeToEmpty()

BatteryMode() (0x03); [0x03]

DESCRIPTION This function selects the various battery operational modes and reports the battery’s mode and

requests.

Defined modes include

•

Whether the battery’s capacity information is specified in mAh or 10 mWh (CAPACITY_MODE bit)

Whether the ChargingCurrent() and ChargingVoltage() values are broadcast to the Smart Battery Charger

when the bq2060 detects that the battery requires charging (CHARGER_MODE bit)

•

Whether all broadcasts to the Smart Battery Charger and Host are disabled

The defined request condition is the battery requesting conditioning cycle (RELEARN_FLAG).

PURPOSE

The CAPACITY_MODE bit allows power management systems to best match their electrical

characteristics with those reported by the battery. For example, a switching power supply

represents a constant power load, whereas a linear supply is better represented by a constant

current model. The CHARGER_MODE bit allows a SMBus Host or Smart Battery Charger to

override the Smart Battery’s desired charging parameters disabling the bq2060’s broadcasts. The

RELEARN_ FLAG bit allows the bq2060 to request a conditioning cycle.

SMBus PROTOCOL Read orWriteWord

INPUT/OUTPUT

Unsigned integer —bit mapped— see below.

Units: not applicable

Range: 0–1

Granularity: not applicable

Accuracy: not applicable

The BatteryMode() word is divided into two halves, the most significant bit (bits 8–15) which is read/write and the

least significant bit (bits 0–7) which is read only. The bq2060 forces bits 0–6 to zero and prohibits writes to bit 7.

Table 9 summarizes the meanings of the individual bits in the BatteryMode() word and specifies the default

values, where applicable, are noted.

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Table 9. Battery Mode Bits and Values

BATTERY MODE() BITS

BITS USED

FORMAT

ALLOWABLE VALUES

INTERNAL_CHARGE_CONTR

OLLER

0

Read only bit flag

PRIMARY_BATTERY_SUPPO

RT

1

Read only bit flag

Reserved

2–6

7

RELEARN_FLAG

Read only bit flag

R/W bit flag

0—Battery OK

1—Relearn cycle requested

CHARGE_CONTROLLER_ENA

BLED

8

PRIMARY_BATTERY

Reserved

9

R/W bit flag

10–12

13

ALARM_MODE

R/W bit flag

0—Enable alarm broadcast (default)

1—Disable alarm broadcast

CHARGER_MODE

CAPACITY_MODE

14

15

0—Enable charging broadcast (default)

1—Disable charging broadcast

0—Report in mA or mAh (default)

1—Report in 10mW or 10mWh

INTERNAL_CHARGE_CONTROLLER bit is not used by the bq2060.

PRIMARY_BATTERY_SUPPORT bit is not used by the bq2060.

RELEARN_FLAG bit set indicates that the bq2060 is requesting a capacity relearn cycle for the battery. The

bq2060 sets the RELEARN_FLAG on a full reset and it detects 20 cycle counts without an FCC update. The

bq2060 clears this flag after a learning cycle has been completed.

CHARGE_CONTROLLER_ENABLED bit is not used by the bq2060. The bq2060 forces this bit to zero.

PRIMARY_BATTERY bit is not used by the bq2060. The bq2060 forces this bit to zero.

ALARM_MODE bit is set to disable the bq2060’s ability to master the SMBus and send AlarmWarning()

messages to the SMBus Host and the Smart Battery Charger. When set, the bq2060 does not master the

SMBus, and AlarmWarning() messages are not sent to the SMBus Host and the Smart Battery Charger for a

period of no more than 65 s and no less than 45 s. When cleared (default), the Smart Battery sends the

AlarmWarning() messages to the SMBus Host and the Smart Battery Charger any time an alarm condition is

detected.

•

The bq2060 polls the ALARM_MODE bit at least every 150 ms. Whenever the ALARM_MODE bit is set, the

bq2060 resets the bit and starts or restarts a 55 s (nominal) timer. After the timer expires, the bq2060

automatically enables alarm broadcasts to ensure that the accidental deactivation of broadcasts does not

persist. To prevent the bq2060 from becoming a master on the SMBus, an SMBus host must therefore

continually set this bit at least once per 50s to keep the bq2060 from broadcasting alarms.

•

The ALARM_MODE bit defaults to a cleared state within 130 ms after the bq2060 detects the SMBus

Off-State.

The condition of the ALARM-MODE bit does NOT affect the operation or state of the CHARGER_MODE bit

which is used to prevent broadcasts ChargingCurrent() and ChargingVoltage() to the Smart Battery Charger.

CHARGER_MODE bit enables or disables the bq2060’s transmission of ChargingCurrent() and

ChargingVoltage() messages to the Smart Battery Charger. When set, the bq2060 does NOT transmit

ChargingCurrent() and ChargingVoltage() values to the Smart Battery Charger. When cleared, the bq2060

transmits the ChargingCurrent() and ChargingVoltage() values to the Smart Battery Charger. The

CHARGER_MODE bit defaults to a cleared state within 130 ms after the bq2060 detects the SMBus Off state.

CAPACITY_MODE bit indicates if capacity information is reported in mA/mAh or 10 mW/10 mWh. When set, the

bq2060 reports capacity information in 10mW/10mWh as appropriate. When cleared, the bq2060 reports

capacity information in mA/mAh as appropriate. The CAPACITY_MODE bit defaults to a cleared state within 130

ms after the bq2060 detects the SMBus Off state.

NOTE 1: The following functions are changed to accept or return values in mA/mAh or 10 mW/10 mWh

depending on the CAPACITY_MODE bit:

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•

RemainingCapacityAlarm()

AtRate()

RemainingCapacity()

FullChargeCapacity()

DesignCapacity()

NOTE 2: The following functions are calculated on the basis of capacity and may be calculated differently

depending on the CAPACITY_MODE bit:

•

AtRateOK()

AtRateTimeToEmpty()

AtRateTimeToFull()

RunTimeToEmpty()

AverageTimeToEmpty()

AverageTimeToFull()

Remaining Time Alarm()

BatteryStatus()

The bq2060 updates the non-AtRate related register values within 3 s of changing the state of the CAPACITY_

MODE bit. The AtRate() values is updated after the next AtRate value is written to the bq2060 (or after the next

20-s scheduled refresh calculation).

AtRate() (0x04); [0x04]

DESCRIPTION

The AtRate() function is the first half of a two-function call-set used to set the AtRate value used in

calculations made by the AtRateTimeToFull(), AtRateTime-ToEmpty(), and AtRateOK() functions.

The AtRate value may be expressed in either current (mA) or power (10 mWh) depending on the

setting of the BatteryMode()’s CAPACITY_MODE bit.

PURPOSE

Because the AtRate() function is the first half of two-function call-set, it is followed by the second

function of the call-set that calculates and returns a value based on the AtRate value and the

battery’s present state. A delay of up to 1.3 s is required after writing AtRate() before the bq2060

can acknowledge the requested AtRate function.

•

When the AtRate() value is positive, the AtRate-TimeToFull() function returns the predicted time to full

charge at the AtRate value of charge.

When the AtRate() value is negative, the AtRateTimeToEmpty() function returns the predicted operating time

at the AtRate value of discharge.

When the AtRate() value is negative, the AtRateOK() function returns a Boolean value that predicts the

battery’s ability to supply the AtRate value of additional discharge energy (current or power) for 10 seconds.

The default value for AtRate() is zero. Writing AtRate() values over the HDQ16 serial port does not trigger a

re-calculation of AtRateTimeToFull(), AtRateTimeToEmpty(), and AtRateOK() functions.

It is recommended that AtRate() requests should be limited to one request every 4 s.

SMBus PROTOCOL Read orWriteWord

INPUT/OUTPUT Signed integer—charge or discharge; the AtRate() value is positive for charge, negative for

discharge, and zero for neither (default).

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BATTERY MODES

CAPACITY_MODE

bit = 0

CAPACITY_MODE

bit = 1

Units

mA

1 to 32,767 mA

–1 to –32,768 mA

1 Unit

10 mW

Charge Range

Discharge Range

Granularity

1 to 32,768 10 mW

–1 to –32,768 10 mW

Accuracy

NA

AtRateTimeToFull() (0x05);[0x05]

DESCRIPTION

Returns the predicted remaining time to fully charge the battery at the AtRate( ) value (mA).

PURPOSE

The AtRateTimeToFull() function is part of two-function call-set used to determine the predicted

remaining charge time at the AtRate value in mA. The bq2060 updates AtRateTimeToFull() within

1.3 s after the SMBus Host sets the AtRate value. If read before this delay, the command is No

Acknowledged and the error code in BatteryStatus is set to not ready. The bq2060 automatically

updates AtRateTimeToFull() based on the AtRate() value every 20 s.

SMBus PROTOCOL ReadWord

OUTPUT

Unsigned integer—predicted time in minutes to fully charge the battery.

Units: minutes

Range: 0 to 65,534 min

Granularity: 2 min or better

Accuracy: ±MaxError() *

FullChargeCapacity()/|AtRate()|

Invalid Data Indication: 65,535 indicates the battery is not being charged.

AtRateTimeToEmpty() (0x06); [0x06]

DESCRIPTION

Returns the predicted remaining operating time if the battery is discharged at the AtRate() value.

PURPOSE

The AtRateTimeToEmpty() function is part of a two-function call-set used to determine the

remaining operating time at the AtRate()value. The bq2060 updates AtRateTimeToEmpty() within

1.3s after the SMBus Host sets the AtRate() value. If read before this delay, the command is No

Acknowledged, and the error code in BatteryStatus is set to not ready. The bq2060 automatically

updates AtRateTimeToEmpty() based on the AtRate() value every 20s.

SMBus PROTOCOL ReadWord

OUTPUT

Unsigned integer—estimated operating time left.

Units: minutes

Granularity: 2 min or better

Range: 0 to 65,534 min

Accuracy: –0, +MaxError()

FullChargeCapacity/|AtRate()|

Invalid Data Indication: 65,535 indicates the battery is not being charged.

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AtRateOK() (0x07); [0x07]

DESCRIPTION

Returns a Boolean value that indicates whether or not the battery can deliver the AtRate( )value of

additional energy for 10 seconds (Boolean). If the AtRate value is zero or positive, the AtRateOK()

function ALWAYS returns true.

PURPOSE

The AtRateOK() function is part of a two-function call-set used by power management systems to

determine if the battery can safely supply enough energy for an additional load. The bq2060

updates AtRateOK() within 1.3 s after the SMBus Host sets the AtRate( ) value. If read before this

delay, the command is No Acknowledged, and the error code in BatteryStatus is set to not ready.

The bq2060 automatically updates AtRateOK() based on the At Rate() value every 20 s.

SMBus PROTOCOL ReadWord

OUTPUT

Boolean—indicates if the battery can supply the additional energy requested.

Units: Boolean

Range: TRUE, FALSE

Granularity: not applicable

Accuracy: not applicable

Temperature() (0x08); [0x08]

DESCRIPTION

Returns the temperature (K) measured by the bq2060.

PURPOSE

The Temperature() function provides accurate cell temperatures for use by battery chargers and

thermal management systems. A battery charger can use the temperature as a safety check.

Thermal management systems may use the temperature because the battery is one of the largest

thermal sources in a system.

SMBus PROTOCOL ReadWord

OUTPUT

Unsigned integer—cell temperature in tenth-degree Kelvin increments.

Units: 0.1°K

Range: 0 to +6553.5°K {real range}

Granularity: 0.1°K

Accuracy: ±1.°K (from ideal 103AT thermistor performance, after calibration)

Voltage() (0x09); [0x09]

DESCRIPTION Returns the cell-pack voltage (mV).

PURPOSE

The Voltage() function provides power management systems with an accurate battery terminal

voltage. Power management systems can use this voltage, along with battery current information,

to characterize devices they control. This ability helps enable intelligent, adaptive power

management systems.

SMBus PROTOCOL ReadWord

OUTPUT:

Unsigned integer—battery terminal voltage in mV.

Units: mV

Range: 0 to 20,000 mV

Granularity: 1 mV

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Accuracy: ±0.65% (after calibration)

Current() (0x0a); [0x0a]

DESCRIPTION

Returns the current being supplied (or accepted) through the battery’s terminals (mA).

PURPOSE

The Current() function provides a snapshot for the power management system of the current

flowing into or out of the battery. This information is of particular use in power-management

systems because they can characterize individual devices and tune their operation to actual system

power behavior.

SMBus PROTOCOL ReadWord

OUTPUT

Signed integer—charge/discharge rate in mA increments—positive for charge, negative for

discharge.

Units: mA

Range: (±250 mV/RS) mA

Granularity: 0.038 mV/RS (integer value)

Accuracy: ±1 mV/RS (after calibration)

AverageCurrent() (0x0b); [0x0b]

DESCRIPTION

Returns a value that approximates a 1-minute rolling average of the current being supplied (or

accepted) through the battery’s terminals (mA). The AverageCurrent() function returns meaningful

values during the battery’s first minute of operation.

PURPOSE:

The AverageCurrent() function provides the average current flowing into or out of the battery for the

power management system.

SMBus PROTOCOL ReadWord

OUTPUT

Signed integer—charge/discharge rate in mA increments—positive for charge, negative for

discharge.

Units: mA

Range: (± 250 mV/R_S)mA

Granularity: 0.038 mV/R_S(integer value)

Accuracy: ±1m V/R_S(after calibration)

MaxError() (0x0c); [0x0c]

DESCRIPTION

Returns the expected margin of error (%) in the state of charge calculation. For example, when

MaxError() returns 10% and RelativeStateOfCharge() returns 50%, the Relative StateOfCharge() is

more likely between 50% and 60%. The bq2060 sets MaxError() to 100% on a full reset. The

bq2060 sets MaxError() to 2% on completion of a learning cycle, unless the bq2060 limits the

learning cycle to the +512/–256 mAh maximum adjustment values. If the learning cycle is limited,

the bq2060 sets MaxError() to 8% unless MaxError() was already below 8%. In this case

MaxError() does not change. The bq2060 increments MaxError() by 1% after four increments of

CycleCount() without a learning cycle.

If voltage-based corrections are applied to the coulomb counter, MaxError() is set to 25%.

PURPOSE

The MaxError() function has real value in two ways: first, to give the user a confidence level about

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the state of charge and second, to give the power management system information about how

aggressive it should be, particularly as the battery nears the end of its life.

SMBus PROTOCOL ReadWord

OUTPUT

Unsigned integer—percent uncertainty for selected information.

Units: %

Range: 2% to 100%

Granularity: 1%

Accuracy: not applicable

RelativeStateOfCharge() (0x0d); [0x0d]

DESCRIPTION

Returns the predicted remaining battery capacity expressed as

FullChargeCapacity() (%).

a

percentage of

PURPOSE

The RelativeStateOfCharge() function is used to estimate the amount of charge remaining in the

battery relative to the last learned capacity.

SMBus PROTOCOL ReadWord

OUTPUT

Unsigned integer—percent of remaining capacity.

Units: %

Granularity: 1%

Range: 0 to 100%

Accuracy: –0, +MaxError()

AbsoluteStateOfCharge()(0x0e); [0x0e]

DESCRIPTION

Returns the predicted remaining battery capacity expressed as a percentage of DesignCapacity()

(%). Note that AbsoluteStateOfCharge() can return values greater than 100%.

PURPOSE

The AbsoluteStateOfCharge() function is used to estimate the amount of charge remaining in the

battery relative to the nominal or DesignCapacity().

SMBUS PROTOCOL ReadWord

OUTPUT

Unsigned integer—percent of remaining capacity.

Units: %

Range: 0% to 100+%

Granularity: 1%

Accuracy: –0, +MaxError()

RemainingCapacity() (0x0f); [0x0f]

DESCRIPTION

Returns the predicted charge or energy remaining in the battery. The RemainingCapacity() value is

expressed in either charge (mAh at a C/5 discharge rate) or energy 10 mWh at a P/5 discharge

rate) depending on the setting of the BatteryMode()’s CAPACITY_MODE bit.

PURPOSE

The RemainingCapacity() function returns the battery’s remaining capacity. This information is a

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numeric indication of remaining charge or energy given by the Absolute or Relative

StateOfCharge() functions and may be in a better form for use by power management systems.

SMBus PROTOCOL ReadWord

OUTPUT Unsigned integer—remaining charge in mAh or 10mWh.

BATTERY MODES

CAPACITY_MODE

bit = 0

CAPACITY_MODE

bit = 1

Units

Range

mAh

0 to 65,535 mAh

mAh

10 mWh

0 to 65,535 10 mWh

10 mWh

Granularity

Accuracy

–0, +MaxError() * FullChargeCapacity()

FullChargeCapacity() (0x10); [0x10]

DESCRIPTION

Returns the predicted pack capacity when it is fully charged. The FullChargeCapacity() value is

expressed in either current (mAh at a C/5 discharge rate) or power 10 mWh at a P/5 discharge

rate) depending on the setting of the BatteryMode()’s CAPACITY_MODE bit.

PURPOSE

The FullChargeCapacity() function provides the user with a means of understanding the tank size of

their battery. This information, along with information about the original capacity of the battery, can

be presented to the user as an indication of battery wear.

SMBus PROTOCOL ReadWord

OUTPUT Unsigned integer—estimated full-charge capacity in mAh or 10mWh.

BATTERY MODES

CAPACITY_MODE

bit = 0

CAPACITY_MODE

bit = 1

Units

Range

mAh

0 to 65,535 mAh

mAh

10 mWh

0 to 65,535 10 mWh

10 mWh

Granularity

Accuracy

–0, +MaxError() * FullChargeCapacity()

RunTimeToEmpty() (0x11); [0x11]

DESCRIPTION

Returns the predicted remaining battery life at the present rate of discharge (minutes). The

RunTimeToEmpty() value is calculated based on either current or power depending on the setting

of the BatteryMode()’s CAPACITY_ MODE bit.

PURPOSE

The RunTimeToEmpty() provides the power management system with information about the

relative gain or loss in remaining battery life in response to a change in power policy. This

information is NOT the same as the AverageTimeToEmpty(), which is not suitable to determine the

effects that result from a change in power policy.

SMBus PROTOCOL ReadWord

OUTPUT

Unsigned integer—minutes of operation left.

Units: minutes

Range: 0 to 65,534 min

Granularity: 2 min or better

Accuracy: –0, +MaxError() x FullChargeCapacity() / Current()

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Invalid Data Indication: 65,535 indicates battery is not being discharged.

AverageTimeToEmpty() (0x12); [0x12]

DESCRIPTION

Returns a 1-minute rolling average of the predicted remaining battery life (minutes). The

AverageTimeToEmpty() value is calculated based on either current or power depending on the

setting of the BatteryMode()’s CAPACITY_MODE bit.

PURPOSE

The AverageTimeToEmpty() displays state-of-charge information in a more useful way. It averages

the instantaneous estimations so that the remaining time does not appear to jump around.

SMBus PROTOCOL ReadWord

OUTPUT

Unsigned integer—minutes of operation left.

Units: minutes

Range: 0 to 65,534 min

Granularity: 2 min or better

Accuracy: –0, +MaxError() x FullChargeCapacity() / AverageCurrent()

Invalid Data Indication: 65,535 indicates battery is not being discharged.

AverageTimeToFull() (0x13); [0x13]

DESCRIPTION

Returns a 1-minute rolling average of the predicted remaining time until the battery reaches full

charge (minutes).

PURPOSE

The AverageTimeToFull() function can be used by the SMBus Host’s power management system

to aid in its policy. It may also be used to find out how long the system must be left on to achieve

full charge.

SMBus PROTOCOL ReadWord

OUTPUT

Unsigned integer —remaining time in minutes.

Units: minutes

Range: 0 to 65,534 min

Granularity: 2 min or better

Accuracy: MaxError() x FullChargeCapacity() / AverageCurrent()

Invalid Data Indication: 65,535 indicates the battery is not being charged.

ChargingCurrent() (0x14); [0x14]

DESCRIPTION

Returns the desired charging rate in mA.

PURPOSE

The ChargingCurrent() function sets the maximum charge current of the battery. The

ChargingCurrent() value should be used in combination with the ChargingVoltage() value to set the

charger’s operating point. Together, these functions permit the bq2060 to dynamically control the

charging profile (current/ voltage) of the battery. The bq2060 can effectively turn off a charger by

returning a value of 0 for this function. The charger may be operated as a constant-voltage source

above its maximum regulated current range by returning a ChargingCurrent() value of 65,535.

SMBus PROTOCOL ReadWord

OUTPUT

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Unsigned integer—maximum charger output current in mA.

Units: mA

Range: 0 to 65,535 mA

Granularity: 1 mA

Accuracy: not applicable

Invalid Data Indication: 65,535 indicates that a charger should operate as a voltage source outside

its maximum regulated current range.

ChargingVoltage() (0x15); [0x15]

DESCRIPTION

Returns the desired charging voltage in mV.

PURPOSE

The ChargingVoltage() function sets the maximum charge voltage of the battery. The

ChargingVoltage() value should be used in combination with the ChargingCurrent() value to set the

charger’s operating point. Together, these functions permit the bq2060 to dynamically control the

charging profile (current/ voltage) of the battery. The charger may be operated as

constant-current source above its maximum regulated voltage range by returning

ChargingVoltage() value of 65,535.

a

SMBus PROTOCOL WriteWord

OUTPUT

Unsigned integer—charger output voltage in mV.

Units: mA

Range: 0 to 65,535 mA

Granularity: 1 mA

Accuracy: not applicable

Invalid Data Indication: 65,535 indicates that a charger should operate as a current source outside

its maximum regulated current range.

BatteryStatus()(0x16); [0x16]

DESCRIPTION

Returns the bq2060’s status word (flags). Some of the BatteryStatus() flags

(REMAINING_CAPACITY_ ALARM and REMAINING_TIME_ALARM) are calculated based on

either current or power depending on the setting of the BatteryMode()’s CAPACITY_ MODE bit.

This is important because use of the wrong calculation mode may result in an inaccurate alarm.

PURPOSE

The BatteryStatus() function is used by the power management system to get alarm and status bits,

as well as error codes from the bq2060. This is basically the same information broadcast to both

the SMBus Host and the Smart Battery Charger by the AlarmWarning() function except that the

AlarmWarning() function sets the Error Code bits all high before sending the data.

SMBus PROTOCOL ReadWord

OUTPUT:

Unsigned integer—Status Register with alarm conditions bit mapped as follows:

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ALARM BITS

OVER_CHARGED_ALARM

0x8000

0x4000

0x2000

0x1000

0x0800

0x0400

0x0200

0x0100

TERMINATE_CHARGE_ALARM

reserved

OVER_TEMP_ALARM

TERMINATE_DISCHARGE_ALARM

reserved

REMAINING_CAPACITY_ALARM

REMAINING_TIME_ALARM

STATUS BITS

0x0080

0x0040

0x0020

0x0010

INITIALIZED

DISCHARGING

FULLY_CHARGED

FULLY_DISCHARGED

ERROR CODES

0x0007

0x0006

0x0005

0x0004

0x0003

0x0002

0x0001

0x0000

Unknown Error

BadSize

Overflow/Underflow

AccessDenied

UnsupportedCommand

ReservedCommand

Busy

OK

Alarm Bits

OVER_CHARGED_ALARM bit is set whenever the bq2060 detects that the battery is being charged beyond the

Maximum Overcharge limit. This bit is cleared when the bq2060 detects that the battery is no longer being

charged (i.e., the bq2060 detects discharge activity or no activity for the digital filter timeout periods. The digital

filter timeout period (seconds) equates to 10 times the value shared in Digital Filter EE0x52.)

TERMINATE_CHARGE_ALARM bit is set when the bq2060 detects that one or more of the battery’s charging

parameters are out of range (e.g., its voltage, current, or temperature is too high) or when the bq2060 detects a

primary charge termination. This bit is cleared when the parameter falls back into the allowable range, the

termination condition ceases, or when the bq2060 detects that the battery is no longer being charged.

OVER_TEMP_ALARM bit is set when the bq2060 detects that the internal battery temperature is greater than or

equal to the MaxT limit. This bit is cleared when the internal temperature falls back into the acceptable range.

TERMINATE_DISCHARGE_ALARM bit is set when the bq2060 detects that Voltage() is less than EDV0 or

when the CVUV bit in Pack Status is set indicating that a Li-ion cell voltage has dropped below the limit

programmed in Cell Under / Over Voltage. The bit is cleared when Voltage() is greater than EDV0 or when the

CVUV bit is cleared.

REMAINING_CAPACITY_ALARM bit is set when the bq2060 detects that RemainingCapacity() is less than that

set by the RemainingCapacityAlarm() function. This bit is cleared when either the value set by the

RemainingCapacityAlarm() function is lower than the RemainingCapacity() or when the RemainingCapacity() is

increased by charging.

REMAINING_TIME_ALARM bit is set when the bq2060 detects that the estimated remaining time at the present

discharge rate is less than that set by the RemainingTimeAlarm() function. This bit is cleared when either the

value set by the RemainingTimeAlarm() function is lower than the AverageTimeToEmpty() or when the

AverageTimeToEmpty() is increased by charging.

Status Bits

INITIALIZED bit is set when the bq2060 is has detected a valid load of EEPROM. It is cleared when the bq2060

detects an improper EEPROM load.

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DISCHARGING bit is set when the bq2060 determines that the battery is not being charged. This bit is cleared

when the bq2060 detects that the battery is being charged.

FULLY_CHARGED bit is set when the bq2060 detects a primary charge termination or an overcharged

condition. It is cleared when RelativeStateOfCharge() is less than or equal to the programmed Fully Charged

Clear % in EE 0x4c.

FULLY_DISCHARGED bit is set when Voltage() is less than the EDV2 threshold. This bit is cleared when the

Relative StateOfCharge() is greater than or equal to 20%.

ERROR CODES

OK

DESCRIPTION

The bq2060 processed the function code without detecting any errors.

The bq2060 is unable to process the function code at this time.

Busy

Reserved

The bq2060 detected an attempt to read or write to a function code

reserved by this version of the specification. The 2060 detected an

attempt to access an unsupported optional manufacturer function

code.

Unsupported

The bq2060 does not support this function code which is defined in

this version of the specification.

AccessDenied

Over/Underflow

BadSize

The bq2060 detected an attempt to write to a read-only function code.

The bq2060 detected a data overflow or underflow.

The bq2060 detected an attempt to write to a function code with an

incorrect data block.

UnknownError

The bq2060 detected an unidentifiable error.

CycleCount()(0x17); [0x17]

DESCRIPTION

Returns the number of cycles the battery has experienced. The mAh value of each count is

determined by programming the Cycle Count Threshold value in EE 0x3c–0x3d. The bq2060 saves

the cycle count value to Cycle Count EE 0x0e–0x0f after an update to CycleCount().

PURPOSE

The CycleCount() function provides a means to determine the battery’s wear. It may be used to

give advanced warning that the battery is nearing its end of life.

SMBus PROTOCOL ReadWord

OUTPUT

Unsigned integer—count of total charge removed from the battery over its life.

Units: cycle

Range: 0 to 65,534 cycles 65,535 indicates battery has experienced 65,535 or more cycles.

Granularity: 1 cycle

Accuracy: absolute count

DesignCapacity() (0x18); [0x18]

DESCRIPTION

Returns the theoretical or nominal capacity of a new pack. The DesignCapacity() value is

expressed in either current (mAh at a C/5 discharge rate) or power, (10 mWh at a P/5 discharge

rate) depending on the setting of the BatteryMode()’s CAPACITY_MODE bit.

PURPOSE

The DesignCapacity() function is used by the SMBus Host’s power management with

FullChargeCapacity() to determine battery wear. The power management system may present this

information to the user and also adjust its power policy as a result.

SMBus PROTOCOL ReadWord

OUTPUT

Unsigned integer—battery capacity in mAh or 10 mWh.

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BATTERY MODES

CAPACITY_MODE

bit = 0

CAPACITY_MODE

bit = 1

Units

Range

mAh

10 mWh

0 to 65,535 mAh

Not applicable

0 to 65,535 10 mWh

Granularity

Accuracy

DesignVoltage() (0x19); [0x19]

DESCRIPTION

Returns the theoretical voltage of a new pack (mV). The bq2060 sets DesignVoltage() to the value

programmed in Design Voltage EE 0x12–0x13.

PURPOSE

The DesignVoltage() function can be used to give additional information about a particular Smart

Battery’s expected terminal voltage.

SMBus PROTOCOL ReadWord

OUTPUT

Unsigned integer—the battery’s designed terminal voltage in mV

Units: mV

Range: 0 to 65,535 mV

Granularity: not applicable

Accuracy: not applicable

SpecificationInfo() (0x1a); [0x1a]

DESCRIPTION

Returns the version number of the Smart Battery Specification that the battery pack supports, as

well as voltage and current scaling information in a packed unsigned integer. Power scaling is the

product of the voltage scaling times the current scaling. The SpecificationInfo is packed in the

following fashion: (SpecID_H * 0x10 + SpecID_L) + (VScale + IPScale * 0x10) * 0x100.

The bq2060 VScale (voltage scaling) and IPScale (current scaling) should always be set to zero.

The bq2060 sets SpecificationInfo() to the value programmed Specification Information EE

0x14–0x15.

PURPOSE

The SpecificationInfo() function is used by the SMBus Host’s power management system to

determine what information the Smart Battery can provide.

SMBus PROTOCOL ReadWord

OUTPUT

Unsigned integer—packed specification number and scaling information.

FIELD

SpecID_L

SpecID_H

VScale

BITS USED

0...3

FORMAT

ALLOWABLE VALUES

0–15

4-bit binary value

4...7

0–15

8...11

0 (multiplies voltage by 10^ VScale)

0 (multiplies current by 10 ^ IPScale)

IPScale

12...15

ManufactureDate() (0x1b); [0x1b]

DESCRIPTION

This function returns the date the cell pack was manufactured in a packed integer. The date is

packed in the following fashion: (year-1980) * 512 + month * 32 + day. The bq2060 sets

ManufactureDate() to the value programmed in Manufacture Date EE 0x16–0x17.

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PURPOSE

The ManufactureDate() provides the system with information that can be used to uniquely identify a

particular battery pack when used with SerialNumber().

SMBus PROTOCOL ReadWord

OUTPUT

Unsigned integer—packed date of manufacture.

FIELD

Day

BITS USED

0...4

FORMAT

ALLOWABLE VALUES

0–31 (corresponds to date)

5-bit binary value

4-bit binary value

7-bit binary value

Month

Year

5...8

1–12 (corresponds to month number)

0–127 (corresponds to year biased by 1980)

9...15

SerialNumber() (0x1c); [0x1c]

DESCRIPTION

This function is used to return a serial number. This number, when combined with the

ManufacturerName(), the DeviceName(), and the ManufactureDate(), uniquely identifies the battery

(unsigned int). The bq2060 sets SerialNumber() to the value programmed in Serial Number EE

0x18–0x19.

PURPOSE

The SerialNumber() function can be used to identify a particular battery. This may be important in

systems that are powered by multiple batteries where the system can log information about each

battery that it encounters.

SMBus PROTOCOL ReadWord

OUTPUT Unsigned integer

ManufacturerName() (0x20); [0x20-0x25]

DESCRIPTION

This function returns a character array containing the battery’s manufacturer’s name. For example,

MyBattCo would identify the Smart Battery’s manufacturer as MyBattCo. The bq2060 sets

ManufacturerName() to the value programmed in Manufacturer Name EE 0x20–0x2a.

PURPOSE

The ManufacturerName() function returns the name of the Smart Battery’s manufacturer. The

manufacturer’s name can be displayed by the SMBus Host’s power management system display as

both an identifier and as an advertisement for the manufacturer. The name is also useful as part of

the information required to uniquely identify a battery.

SMBus PROTOCOL Read Block

OUTPUT

String—character string with maximum length of 11 characters (11+length byte).

DeviceName() (0x21); [0x28-0x2b]

DESCRIPTION

This function returns a character string that contains the battery’s name. For example,

DeviceName() of BQ2060 would indicate that the battery is a model BQ2060. The bq2060 sets

DeviceName() to the value programmed in Device Name EE 0x30–0x37.

PURPOSE

The DeviceName() function returns the battery’s name for identification purposes.

SMBus PROTOCOL Read Block

OUTPUT

String—character string with maximum length of 7 characters (7+length byte).

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DeviceChemistry() (0x22); [0x30-0x32]

DESCRIPTION

This function returns a character string that contains the battery’s chemistry. For example, the

DeviceChemistry() function returns NiMH, the battery pack would contain nickel metal hydride cells.

The bq2060 sets DeviceChemistry() to the value programmed in Device Chemistry EE 0x40–0x44.

PURPOSE

The DeviceChemistry() function gives cell chemistry information for use by charging systems. The

bq2060 does not use DeviceChemisty() values for internal charge control or fuel gauging.

SMBus PROTOCOL Read Block

OUTPUT

Output: String—character string with maximum length of 4 characters (4+length byte).

NOTE:

The following is a partial list of chemistries and their expected abbreviations. These

abbreviations are not case sensitive.

Lead acid

Lithium ion

PbAc

LION

NiCd

NiMH

NiZn

RAM

ZnAr

Nickel cadmium

Nickel metal hydride

Nickel zinc

Rechargeable alkaline-manganese

Zinc air

ManufacturerData() (0x23); [0x38–0x3a]

DESCRIPTION

This function allows access to the manufacturer data contained in the battery (data). The bq2060

stores seven critical operating parameters in this data area.

PURPOSE

The ManufacturerData() function may be used to access the manufacturer’s data area. The data

fields of this command reflect the programming of five critical EEPROM locations and can be used

to facilitate evaluation bq2060 under various programming sets. The ManufacturerData() function

returns the following information in order: Control Mode, Digital Filter, Self-Discharge Rate, Battery

Low %, Near Full, and the pending EDV threshold voltage (low byte and high byte.)

SMBus PROTOCOL Read Block

Pack Status and Pack Configuration (0x2f); [0x2f]

DESCRIPTION

This function returns the Pack Status and Pack Configuration registers. The Pack Status register

contains number of status bits relating to bq2060 operation. The Pack Status register is the least

significant byte of the word. The Pack Configuration register is the most significant byte of the word.

The byte reflects how the bq2060 is configured as defined by the value programmed in Pack

Configuration in EE 0x3f.

The Pack Status Register consists of the following bits:

b7

b6

b5

b4

b3

b2

b1

b0

OCE

EDV2

EINT

VDQ

COK

DOK

CVOK

CVUV

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OCE

The OCE bit indicates that offset cancellation is enabled. The bq2060 sets this bit after VFC offset

calibration is complete.

0

1

Offset calibration is not enabled

Offset calibration is enabled

EDV2

The EDV2 bit indicates that Voltage() is less than the EDV2 threshold.

0

1

Voltage() > EDV2 threshold (discharging)

Voltage() ≤ EDV2 threshold

EINT

The EINT bit indicates that the VFC has detected a charge or discharge pulse.

0

1

No charge/discharge activity detected

Charge/discharge activity detected.

VDQ

The VDQ bit indicates if the present discharge cycle is valid for an FCC update.

0

1

Discharge cycle is not valid

Discharge cycle is valid

COK

The COK bit indicates the status of the CFC pin of the bq2060.

0

1

CFC pin is low

CFC pin is high

DOK

The DOK bit indicates the status of the DFC pin of the bq2060.

0

1

DFC pin is low

DFC pin is high

CVOV

The CVOV bit indicates that a secondary Li-ion protection limit has been exceeded. It is set if any

individual cell exceeds the programmed high voltage limit, if the pack voltage exceeds the

overvoltage threshold, or if an over-temperature condition occurs. The bit is not latched and merely

reflects the present overvoltage status.

0

1

No secondary protection limits exceeded

A secondary protection limit exceeded

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CVUV

The CVUV bit indicates if any individual cell falls below the programmed low-voltage limit. The bit

applies to lithium batteries only. The bit is not latched and merely reflects the present undervoltage

status.

0

1

All series cells are above the low-voltage limit

A series cell is below the low-voltage limit

VCELL4–VCELL1 (0x3c–0x3f); [0x3c–0x3f]

DESCRIPTION

These functions return the calculated voltages in mV at the VCELL₄through VCELL₁inputs.

EEPROM

GENERAL

The bq2060 accesses the external EEPROM during a full reset and when storing historical data. During an

EEPROM access, the VOUT pin becomes active and the bq2060 uses the ESCL and ESDA pins to

communicate with the EEPROM. The EEPROM stores basic configuration information for use by the bq2060.

The EEPROM must be programmed correctly for proper bq2060 operation.

MEMORY MAP

Table 10 shows the memory map for the EEPROM. It also contains example data for a 10 series NiMH and a

3s3p Li-ion battery pack with a 0.05-Ω sense resistor.

Table 10. EEPROM Memory Map

EEPROM

NAME⁽¹⁾

CHEMISTRY

NIMH

EXAMPLE

DATA

Li-ion

DATA

LSB

ADDRESS

MSB

LSB

7f

EXAMPLE

MSB

3c

00

01

-

0x00

0x02

0x04

0x06

0x07

0x08

0x0a

0x0c

0x0e

0x10

0x12

0x14

0x16

0x18

0x1a

0x1c

0x1e

0x20

0x21

0x22

0x23

0x01

Check Byte 1

Remaining Time Alarm

Remaining Capacity Alarm

EDV A0 Impedance Age Factor

Reserved

Li-ion, Nickel

-

15487

3c

00

01

-

15487

7f

0x03

0x05

10 minutes

0a

5e

00

50

80

00

e0

31

59

01

a0

c8

20

09

42

45

4E

10 minutes

0a

90

00

38

80

00

30

31

59

01

b8

00

64

09

42

45

4e

350 mAh

400 mAh

0

-

0

-

0x09

0x0b

0x0d

0x0f

Reserved

-

0

18000 mV

128

00

46

00

2e

00

26

00

0f

00

03

-

0

00

31

00

2a

00

26

00

0b

00

-

Charging Voltage

Reserved

Li-ion, Nickel

-

12600 mV

128

Cycle Count

Li-ion, Nickel

-

0

0x11

0x13

0x15

0x17

0x19

0x1b

0x1d

0x1f

Reserved

0

Design Voltage

Li-ion, Nickel

12000 mV

v1.1/PEC

10800 mV

Specification Information

Manufacture Date

Serial Number

v1.1/PEC

Li-ion, Nickel 2/25/99=9817

2/25/99=9817

Li-ion, Nickel

1

Fast-Charging Current

Maintenance Charging Current

Pre-Charge Current

Manufacturer Name Length

Character 1

4000mA

3000 mA

200mA

0 mA

800mA

100 mA

9

B

E

N

9

B

E

N

-

Character 2

-

Character 3

-

(1) Reserved locations must be set as shown. Locations marked with an * are calibration values that can be for maximum accuracy. For

these locations the table shows the appropriate default or initial setting.

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EEPROM (continued)

Table 10. EEPROM Memory Map (continued)

EEPROM

NAME⁽¹⁾

CHEMISTRY

NIMH

EXAMPLE

DATA

MSB

Li-ion

DATA

LSB

ADDRESS

LSB

43

48

4d

41

52

51

00

38

07

42

51

32

30

36

30

41

a0

0c

00

e8

04

4e

49

4d

48

c7

70

00

20

00

-

EXAMPLE

MSB

0x24

0x25

0x26

0x27

0x28

0x29

0x2a

0x2b

0x2c

0x2e

0x30

0x31

0x32

0x33

0x34

0x35

0x36

0x37

0x38

0x3a

0x3c

0x3e

0x3f

Character 4

Character 5

Li-ion, Nickel

-

C

-

C

-

43

48

4d

41

52

51

00

07

42

51

32

30

36

30

41

d2

58

00

f6

H

Character 6

M

-

M

-

Character 7

A

-

A

-

Character 8

R

-

R

-

Character 9

Q

-

Q

-

Character 10

0

-

0

-

Light Discharge Current

Reserved

0

-

0

-

0x2d

0x2f

0

00

ff

-

0

00

ff

-

Maximum Overcharge

Device Name Length

Character 1

Li-ion, Nickel

-

200 mAh

256 mAh

7

B

-

B

-

Character 2

Q

-

Q

-

Character 3

2

-

2

-

Character 4

0

-

0

-

Character 5

6

-

6

-

Character 6

0

-

0

-

Character 7

A

-

A

-

0x39

0x3b

0x3d

Last Measured Discharge

Pack Capacity

4000 mAh

0f

fe

-

4050 mAh

0f

f3

-

4000 mAh

4050 mAh

Cycle Count Threshold

Reserved

500 mAh

3240 mAh

0

Pack Configuration

Device Chemistry Length

Character 1

Li-ion, Nickel

Nickel

232

-

246

-

0x40

0x41

0x42

0x43

0x44

0x45

0x46

0x48

0x49

0x4a

4

-

4

-

04

4c

49

4f

N

-

L

-

Character 2

I

-

I

O

-

Character 3

M

-

Character 4

H

-

N

-

4e

cf

MaxT DeltaT

50C,3.0

-

50C, 4.6

6000 mA

800 mV

512 mA

-

0x47

Overload Current

Overvoltage Margin

Overcurrent Margin

Reserved

6000 mA

17

-

17

-

70

32

20

-

0

512 mA

0

-

Cell Under/Over Voltage

Fast Charge Termination %

Fully Charged Clear %

Charge Efficiency

Current Taper Threshold

DeltaT Time

Li-ion

-

118

-

76

9c

a1

ff

0x4b

0x4c

0x4d

0x4e

Li-ion, Nickel

Li-ion

96%

90%

97%

-

a0

a6

e1

-

100%

95%

100%

200 mA

-

12

-

Nickel

180 s

240 s

-

07

04

-

0x4f

Holdoff Time

Nickel

-

Current Taper Qual Voltage

Manufacturers Data Length

Control Mode

Li-ion

-

128 mV

7

-

40

07

04

2d

05

0x50

0x51

0x52

0x53

Li-ion, Nickel

7

-

07

04

2d

cb

-

4

-

4

Digital Filter

50 µV

1%

-

50 µV

0.21%

-

Self-Discharge Rate

-

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EEPROM (continued)

Table 10. EEPROM Memory Map (continued)

EEPROM

ADDRESS

0x54

NAME⁽¹⁾

CHEMISTRY

NIMH

EXAMPLE

DATA

MSB

Li-ion

DATA

LSB

12

64

00

-

EXAMPLE

MSB

LSB

12

64

00

-

Battery Low %

Near Full

Li-ion, Nickel

7%

-

7%

-

0x55

Li-ion, Nickel

200 mAh

0x56

0x58

0x5a

0x5c

0x5e

0x60

0x61

0x62

0x57

Reserved

-

0

-

0

-

0x59

0x5b

0x5d

0x5f

Reserved

-

0

-

Reserved

-

0

-

Reserved

-

0

00

-

00

-

VFC Offset*

Li-ion, Nickel

Li-ion

0

VFC Offset*

0

Temperature Offset*

ADC Offset*

0

-

0

-

Cell 2 Calibration Factor*

-

0x63

Efficiency Temperature

Compensation

Nickel

0.25%

-

20

-

Cell 3 Calibration Factor*

Efficiency Drop Off Percentage

Cell 4 Calibration Factor*

Efficiency Reduction Rate

ADC Voltage Gain*

ADC Sense Resistor Gain*

VFC Sense Resistor Gain*

VOC 25%

Li-ion

-

0

-

00

-

0x64

0x65

Nickel

96%

-

a0

-

Li-ion

-

0

-

00

-

Nickel

1%

-

50

20

d4

00

14

2c

44

1c

10

00

04

-

0x66

0x68

0x6a

0x6c

0x6e

0x70

0x72

0x74

0x76

0x78

0x67

0x69

0x6b

0x6d

0x6f

Li-ion, Nickel

16 : 1

4e

30

20

d3

cf

16 : 1

0.05 Ω

10550 mV

10750 mV

11200 mV

10265 mV

11550

4475

4e

30

20

d6

d4

28

2d

11

00

20

d4

00

ca

02

40

19

1e

7b

eb

0.05 Ω

11500 mV

12500 mv

13500 mV

9500 mV

10000 mV

0

VOC 50%

0x71

0x73

0x75

0x77

0x79

VOC 75%

cb

25

27

00

29

EDVF/EDV0

EMF/ EDV1

EDV T0 Factor

EDV C1/C0 Factor/EDV2

10500 mV

C1 = 0

C0 = 235

0x7a

0x7c

0x7e

0X7b

0x7d

0x7f

EDV R0 Factor

EDV R1 Factor

Check Byte 2

Li-ion, Nickel

0

00

-

00

5a

5350

250

14

00

a5

e6

fa

42330

a5

42330

5a

EEPROM PROGRAMMING

The following sections describe the function of each EEPROM location and how the data is to be stored.

FUNDAMENTAL PARAMETERS

Sense Resistor Value

Two factors are used to scale the current-related measurements. The 16-bit ADC Sense Resistor Gain value in

EE 0x68–0x69 scales Current() to mA. Adjusting ADC Sense Resistor Gain from its nominal value provides a

method to calibrate the current readings for system errors and the sense resistor value (RS). The nominal value

is set by

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EEPROM PROGRAMMING (continued)

625

ADC Sense Resistor Gain +

(R )

s

(4)

The 16-bit VFC Sense Resistor Gain in EE 0x6a–0x6b scales each VFC interrupt to mAh. VFC Sense Resistor

Gain is based on the resistance of the series sense resistor. The following formula computes a nominal or

starting value for VFC Sense Resistor Gain from the sense resistor value.

409.6

VFC Sense Resistor Gain +

(R )

s

(5)

Sense resistor values are limited to the range of 0.00916 Ω to 0.100 Ω.

Digital Filter

The digital filter threshold, VDF (µV), is set by the value stored in Digital Filter EE 0x52.

2250

VDF

Digital Filter +

(6)

CELL CHARACTERISTICS

Battery Pack Capacity and Voltage

Pack capacity in mAh units is stored in Pack Capacity EE 0x3a–0x3b. In mAh mode, the bq2060 copies Pack

Capacity to DesignCapacity(). In mWh mode, the bq2060 multiplies Pack Capacity by Design Voltage EE

0x12–0x13 to calculate DesignCapacity() scaled to 10 mWh. Design Voltage is stored in mV.

The initial value for Last Measured Discharge in mAh is stored in EE 0x38–0x39. Last Measured Discharge is

modified over the course of pack usage to reflect cell aging under the particular use conditions. The bq2060

updates Last Measured Discharge in mAh after a capacity learning cycle. The bq2060 uses the Last Measured

Discharge value to calculate FullChargeCapacity() in mAh or 10mWh mode.

EDV Thresholds and Near-Full Percentage

The bq2060 uses three pack voltage thresholds to provide voltage-based warnings of low battery capacity. The

bq2060 uses the values stored in EEPROM for the EDV0, EDV1, and EDV2 values or calculates the three

thresholds from a base value and the temperature, capacity, and rate adjustment factors stored in EEPROM. If

EDV compensation is disabled then EDV0, EDV1, and EDV2 are stored directly in mV in EE 0x72–0x73, EE

0x74–0x75, and EE 0x78–0x79, respectively.

For capacity correction at EDV2, Battery Low % EE 0x54 can be set at a desired state-of-charge,

STATEOFCHARGE%, in the range of 5% to 20%. Typical values for STATEOFCHARGE% are 7%–12%

representing 7 –12% capacity.

Battery Low %

STATEOFCHARGE% 2.56

(7)

The bq2060 updates FCC if a qualified discharge occurs from a near-full threshold to EDV2. The desired

near-full threshold window, NFW (mAh), is programmed in Near Full in EE 0x55.

NFW

2

Near Full +

(8)

EDV Discharge Rate and Temperature Compensation

If EDV compensation is enabled, the bq2060 calculates battery voltage to determine EDV0, EDV1, and EDV2

thresholds as a function of battery capacity, temperature, and discharge load. The general equation for EDV0,

EDV1, and EDV2 calculation is

_*Ť _I

Ť

R0 F F

EDV0,1,2 + EMF F

BL

LOAD

TZ

CY

(9)

where

•

EMF is a no-load battery voltage that is higher than the highest EDV threshold that is computed. EMF is

programmed in mV in EMF/EDV1 EE 0x74–0x75.

•

I_LOADis the current discharge load.

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EEPROM PROGRAMMING (continued)

F_BLis the factor that adjusts the EDV voltage for battery capacity and temperature to match the no-load

characteristics of the battery.

F

+ f (C0, C ) C1, T)

BL

(10)

where

•

C (0%, 3%, or Battery Low % for EDV0, EDV1, and EDV2, respectively) and C0 are the capacity-related EDV

adjustment factors. C0 is programmed in the lower 11 bits of EDV C0 Factor/EDV2 EE 0x78–79. The Residual

Capacity Factor is stored in the upper bits of EE 0x78–0x79.

Residual Capacity Factor C1 = RESIDUAL% x 256

RESIDUAL % is the desired battery capacity remaining at EDV0 (RM = 0).

•

T is the current temperature in °K

R0 * F_TZrepresents the resistance of the battery as a function of temperature and capacity.

F

+ f (R1, T0, T, C ) C1)

TZ

(11)

•

R0 is the first order rate dependency factor stored in EDV R0 Factor EE 0x7a–0x7b.

T is the current temperature; C is the battery capacity relating to EDV0, EDV1, and EDV2; and C1 is the

desired residual battery capacity remaining at EDV0 (RM = 0).

•

R1 adjusts the variation of impedance with battery capacity. R1 is programmed in EDV R1 Rate Factor EE

0x7c–0x7d.

T0 adjusts the variation of impedance with battery temperature. T0 is programmed in EDV T0 Rate Factor

EE 0x76–0x77.

Battery Low % = 7%, Load = 500mA

11500

11000

45C/500 mA

20C/500 mA

EDV2

10500

EDV1

10000

9500

9000

8500

8000

7500

10

9

8

7

6

5

4

3

2

1

0

% Capacity

Figure 11. EDV Calculations vs. Capacity for Various Temperatures

F_CYis the factor that adjusts for changing cell impedance as the battery pack is cycled:

where

F

f (A0, Cycle Count())

CY

(12)

•

A0 is the EDV aging factor that is stored in EDV A0 Factor EE 0x06. It should be set to 0 for most applications.

Typical values for the EDV compensation factors for a Li-ion 3s3p 18650 pack are

EMF = 11550

T0 = 4475

C0 = 235

C1 = 0

R0 = 5350

R1 = 250

A0 = 0

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EEPROM PROGRAMMING (continued)

The graphs in Figure 11 and Figure 12 show the calculated EDV0, EDV1, and EDV2 thresholds versus capacity

using the typical compensation values for different temperatures and loads for a Li-ion 3s3p 18650 pack. The

compensation values vary widely for different cell types and manufacturers and must be matched exactly to the

unique characteristics for optimal performance.

Overload Current Threshold

The Overload Current threshold is a 16-bit value stored in EE 0x46-0x47 in mA units.

=7%, Temperature = 35

C

Battery Low %

11500

35C/500 mA

11000

EDV2

35C/1 A

10500

EDV1

10000

35C/2 A

9500

9000

8500

8000

7500

EDV0

7000

10

9

8

7

6

5

4

3

2

1

0

% Capacity

Figure 12. EDV Calculations vs. Capacity for Various Loads

Midrange Capacity Corrections

Three voltage-based thresholds, VOC25 EE 0x6c–0x6d, VOC50 EE 0x6e–0x6f, and VOC75 EE 0x70–0x71, are

used to test the accuracy of the RM based on open-circuit pack voltages. These thresholds are stored in the

EEPROM in 2s complement of voltage in mV. The values represent the open-circuit battery voltage at which the

battery capacity should correspond to the associated state of charge for each threshold.

Self-Discharge Rate

The nominal self-discharge rate, %PERDAY (% per day), is programmed in an 8-bit value Self-Discharge Rate

EE 0x53 by the following relation:

52.73

%PERDAY

_{Self * Discharge Rate + 256 *}ǒ

Ǔ

(13)

Light Load Current

The amount of light load current in mA, ILEAK, used for compensation is stored in Light Discharge Current in EE

0x2b as follows:

ILEAK 1024

Light Discharge Rate +

45

(14)

ILEAK is between 0.044 mA and 11.2 mA.

Charge Efficiency

The bq2060 uses four charge-efficiency factors to compensate for charge acceptance. These factors are coded

in Charge Efficiency, Efficiency Reduction Rate, Efficiency Drop Off Percentage, and Efficiency Temperature

Compensation.

The bq2060 applies the efficiency factor, EFF%, when RelativeStateOfCharge() is less than the value coded in

Efficiency Drop Off Percentage EE 0x64. When RelativeStateOfCharge() is greater than or equal to the value

coded in Efficiency Drop Off Percentage, EFF% and ERR% determine the charge efficiency rate. ERR% defines

the percent efficiency reduction per percentage point of RelativeStateOfCharge() over Efficiency Drop Off

Percentage. EFF% is encoded in High Charge Efficiency EE 0x4d according to the following equation:

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EEPROM PROGRAMMING (continued)

Charge Efficiency

10 (EFF% 74.5)

(15)

(16)

where

74.5 ≤ EFF% ≤ 100

ERR% is encoded in Efficiency Reduction Rate EE 0x65 according to the following equation:

ERR%

Efficiency Reduction Rate +

0.0125

where

•

0 ≤ ERR% ≤ 3.19

The Efficiency Drop Off Percentage is stored in 2s complement of percent.

The bq2060 also adjusts the efficiency factors for temperature. TEFF% defines the percent efficiency reduction

per degree C over 25°C. TEFF% is encoded in Efficiency Temperature Compensation EE 0x63 according to the

following equation

Efficiency Temperature Compensation

TEFF% 1.6

0.0125

(17)

where

•

0 ≤ TEFF%≤ 1.99

The bq2060 applies all four charge-compensation factors when the CHEM bit in Pack Configuration is not set,

denoting a nickel pack.

Effective Charge Efficiency Reduction (nickel only)

% + ERR%[RSOC * EDOP%] ) TEFF%[Temperature * 25^oC] ) EFF%

(18)

where

•

RSOC() ≤ EFF% and T≥ 25°C

If CHEM is set denoting a Li-ion pack, the bq2060 applies only the value coded in High Charge Efficiency and

makes no other adjustments for charge acceptance.

CHARGE LIMITS AND TERMINATION TECHNIQUES

Charging Voltage

The 16-bit value, Charging Voltage EE 0x0a-0x0b programs the ChargingVoltage() value broadcast to a Smart

Charger. It is also sets the base value for determining overvoltage conditions during charging and voltage

compliance during a constant-voltage charging methodology. It is stored in mV.

Overvoltage

The 8-bit value, Overvoltage Margin EE 0x48, sets the limit over ChargingVoltage() that is to be considered as

an overvoltage charge-suspension condition. The voltage in mV above the ChargingVoltage(), VOVM, that

should trigger a charge suspend is encoded in Overvoltage Margin as follows:

VOVM

16

Overvoltage Margin +

(19)

where

•

VOVM is between 0 and 4080 mV.

Charging Current

ChargingCurrent() values are either broadcast to a Level 2 Smart Battery Charger or read from the bq2060 by a

Level 3 Smart Battery Charger. The bq2060 sets the value of ChargingCurrent(), depending on the charge

requirements and charge conditions of the pack.

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EEPROM PROGRAMMING (continued)

When fast charge is allowed, the bq2060 sets ChargingCurrent() to the rate programmed in Fast Charging

Current EE 0x1a-0x1b.

When fast charge terminates, the bq2060 sets ChargingCurrent() to zero and then to the Maintenance Charging

Current EE 0x1c-0x1d when the termination condition ceases.

When Voltage() is less than EDV0, the bq2060 sets ChargingCurrent() to Pre-charge Current EE 0x1e-0x1f.

Typically this rate is larger than the maintenance rate to charge a deeply depleted pack up to the point where it

may be fast charged.

Fast Charging Current, Maintenance Charging Current, and Pre-Charge Current are stored in mA.

Charge Suspension

During charge, the bq2060 compares the current to the ChargingCurrent() plus the value IOIM. If the pack is

charged at a current above the ChargingCurrent() plus IOIM, the bq2060 sets ChargingCurrent() to zero to stop

charging. IOIM is programmed in the EEPROM value, Overcurrent Margin, encoded as

IOIM

16

Overcurrent Margin +

(20)

Overcurrent Margin EE 0x49 may be used to program IOIM values of 0 to 4080 mA in 16-mA steps.

The desired temperature threshold for charge suspension, MAXTEMP, may be programmed between 45°C and

69°C in 1.6°C steps. MaxT DeltaT EE 0x45 (most significant nibble) is stored in a 4-bit value as shown:

69 * MAXTEMP

_{MaxT +}ƪ

ƫ

1.6

(21)

The bq2060 suspends fast charge when fast charge continues past full by the amount programmed in Maximum

Overcharge EE 0x2e-0x2f. Maximum Overcharge is programmed in 2s complement form of charge in mAh.

FULLY_CHARGED Bit Clear Threshold

The bq2060 clears the FULLY_CHARGED bit in BatteryStatus() when RelativeStateOfCharge() reaches the

value, Fully Charged Clear %EE 0x4c. Fully Charged Clear % is an 8-bit value and is stored as a 2s complement

of percent.

Fast Charge Termination Percentage

The bq2060 sets RM to a percentage of FCC on charge termination if the CSYNC bit is set in the Pack

Configuration register. The percentage of FCC is stored in Fast Charge Termination % in EE 0x4b. The value is

stored in 2s complement of percent.

Cycle Count Threshold

Cycle Count Threshold 0x3c–0x3d sets the number of mAh that must be removed from the battery to increment

CycleCount(). Cycle Count Threshold is a 16-bit value stored in 2s complement of charge in mAh.

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EEPROM PROGRAMMING (continued)

∆T/ ∆t Rate Programming

The ∆T portion of the ∆T/∆t rate is programmed in DeltaT, the low nibble of MaxT DeltaT EE 0x45 (least

significant nibble). The ∆t portion is programmed in DeltaT Time EE 0x4e.

[DeltaT 2 ) 16]ń10

[320 * DeltaT Time 20]

°C

ƪ _sƫ

DTńDt +

(22)

DeltaT

∆ (°C)

DeltaT_Time

t (s)

320

300

280

260

240

220

200

180

160

140

120

100

80

0

1

2

3

4

5

6

7

8

9

a

b

c

d

e

f

1.6

1.8

2.0

2.2

2.4

2.6

2.8

3.0

3.2

3.4

3.6

3.8

4.0

4.2

4.4

4.6

00

01

02

03

04

05

06

07

08

09

0a

0b

0c

0d

0e

0f

60

40

20

∆T/ ∆t Holdoff Timer Programming

The holdoff timer is programmed in the lower nibble of Holdoff Time EE 0x4f. The holdoff time is 320 s minus 20

times the Holdoff Time value.

Holdoff

Time

Holdoff

Time (s)

Holdoff

Time

Holdoff

Time (s)

00

01

02

03

04

05

06

07

320

300

280

260

240

220

200

180

08

09

0a

0b

0c

0d

0e

0f

160

140

120

100

80

60

40

20

Current Taper Termination Characteristics

Two factors in the EEPROM set the current taper termination for Li-ion battery packs. The two coded locations

are Current Taper Qual Voltage EE 0x4f and Current Taper Threshold EE 0x4e. Current taper termination occurs

during charging when the pack voltage is above the charging voltage minus CELLV (mV) and the charging

current is below the threshold coded in Current Taper Threshold for at least 40 s.

CELLV

Current Taper Qual Voltage +

2

(23)

(24)

R_s

0.5625

i

Current TaperThreshhold +

where i = the desired current termination threshold in mA, and R_S= VFC sense resistor in ohms.

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PACK OPTIONS

Pack Configuration

Pack Configuration EE 0x3f contains bit-programmable features.

b7

b6

b5

b4

b3

b2

b1

b0

DMODE

SEAL

CSYNC

CEDV

VCOR

CHEM

LCC1

LCC0

DMODE

The DMODE bit determines whether the LED outputs will indicate AbsoluteStateOfCharge() or

RelativeStateOfCharge()

0

1

LEDs reflect AbsoluteStateOfCharge()

LEDs reflect RelativeStateOfCharge()

SEAL

The SEAL bit determines the SMBus access state of the bq2060 on reset

0

1

SMBus commands (0x00–0xff) are accessible for both read and write.

SMBus read access is limited to commands (0x05–0x1c) and (0x20–0x23). SMBus read/write

access is limited to commands (0x00–0x04), (0x2f), and (0x3c–0x3f).

CSYNC

In usual operation of the bq2060, the CSYNC bit is set so that the coulomb counter is adjusted when a fast

charge termination is detected. In some applications, especially those where an externally controlled charger is

used, it may be desirable not to adjust the coulomb counter. In these cases the CSYNC bit should be cleared.

0

1

The bq2060 does not alter RM at the time of a valid charge termination.

The bq2060 updates RM with a programmed percentage of FCC at a valid charge termination.

CEDV

The CEDV bit determines whether the bq2060 implements automatic EDV compensation to calculate the EDV0,

EDV1, and EDV2 thresholds based on rate, temperature, and capacity. If reset, the bq2060 uses the fixed values

programmed in EEPROM for EDV0, EDV1, and EDV2. If set the bq2060 calculates EDV0, EDV1, and EDV2.

0

1

EDV compensation disabled

EDV compensation enabled

VCOR

The VCOR bit enables the midrange voltage correction algorithm. When set, the bq2060 compares the pack

voltage to RM and may adjust RM according to the values programmed in VOC25, VOC50, and VOC75.

0

1

Midrange corrections disabled

Midrange corrections enabled

CHEM

The CHEM bit configures the bq2060 for nickel packs (NiCd or NiMH) or Li-ion packs. When set, the bq2060

employs the configuration parameters in EEPROM designated for Li-ion. When not set, the bq2060 employs the

configuration parameters designated for nickel.

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0

1

The bq2060 uses nickel configuration parameters.

The bq2060 uses Li-ion configuration parameters

LCC0 and LCC1

The LCC0 and LCC1 bits configure the cell voltage inputs (VCELL_1–4).

NO. OF SERIES CELLS

LCC1 LCC0

CELL VOLTAGE INPUTS

VCELL₄= Cell Stack

VCELL₁= Cell 1

VCELL₂= Cell 2

VCELL₁= Cell 1

VCELL₂= Cell 2

VCELL₃= Cell 3

VCELL₁= Cell 1

VCELL₂= Cell 2

VCELL₃= Cell 3

VCELL₄= Cell 4

NA

00

2

01

3

10

4

11

For Li-ion packs with individual measurements, LCC0 and LCC1 define the number of series elements and their

voltage measurement inputs. In each case (2, 3, or 4), the bq2060 uses the highest numbered cell voltage input

to measure the pack voltage measurement as returned with Voltage(). For nickel chemistries or Li-ion without

single-cell measurements, LCC0 and LCC1 must be set to 00. VCELL4 is the pack voltage input for this

programming.

Remaining Time and Capacity Alarms

Remaining Time Alarm in EE 0x02–0x03 and Remaining Capacity Alarm in 0x04–0x05 set the alarm thresholds

used in the SMBus command codes 0x01 and 0x02, respectively. Remaining Time Alarm is stored in minutes

and Remaining Capacity Alarm in mAh.

Secondary Protection Limits for Li-ion

The cell undervoltage (V_UV) and overvoltage (V_OV) limits are programmed in Cell Undervoltage/Overvoltage EE

0x4a according to the equations:

V

* 4096

32

OV

Cell UndervoltageńOvervoltage (lower) +

Cell UndervoltageńOvervoltage (upper) +

(25)

(26)

V

* 2048

64

OV

CELL UNDER/

OVERVOLTAGE

(UPPER NIBBLE)

CELL UNDER/

OVER VOLTAGE

(LOWER NIBBLE)

V_UV(mV)

V_OV(mV)

0

1

2

3

4

5

6

7

8

9

a

b

2048

2112

2176

2240

2304

2368

2432

2496

2560

2624

2688

2752

0

1

2

3

4

5

6

7

8

9

a

b

4096

4128

4160

4192

4224

4256

4288

4320

4352

4384

4416

4448

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SLUS035E–JANUARY 2000–REVISED OCTOBER 2005

CELL UNDER/

OVERVOLTAGE

(UPPER NIBBLE)

CELL UNDER/

OVER VOLTAGE

(LOWER NIBBLE)

V_UV(mV)

V_OV(mV)

c

d

e

f

2816

2880

2944

3008

c

d

e

f

4480

4512

4544

4576

Cycle Count Initialization

Cycle Count EE 0x0e–0x0f stores the initial value for the CycleCount() function. It should be programmed to

0x0000.

Control Modes

Control Mode EE 0x51 contains additional bit-programmable features.

b7

b6

b5

b4

b3

b2

b1

b0

NDF

—

HPE

CPE

LED

SC

—

SM

NDF

The NDF bit disables the digital filter during discharge if the SMBC and SMBD lines are high.

0

1

Digital filter enabled all the time

Digital filter disabled if SMBC and SMBD are high

HPE

The HPE bit enables/disables PEC transmissions to the Smart Battery host for master mode alarm messages.

0

1

No PEC byte on alarm warning to host

PEC byte on alarm warning to host

CPE

The CPE bit enables/disables PEC transmissions to the Smart Battery Charger for master mode alarm

messages.

0

1

No PEC byte on broadcasts to charger

PEC byte on broadcasts to charger

LED

The LED bit configures the bq2060 for 4- or 5-LED indication

0

1

Selects the 5-LED indication mode

Selects the 4-LED indication mode

SC

The SC bit enables learning cycle optimization for a Smart Charger or independent charge

0

1

Learning cycle optimized for independent charger

Learning cycle optimized for Smart Charger

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SM

The SM bit enables/disables master mode broadcasts by the bq2060

0

1

Broadcasts to host and charger enabled

Broadcasts to host and charger disabled

If the SM bit is set, modifications to bits in BatteryMode() does not re-enable broadcasts.

MEASUREMENT CALIBRATION

ADC

To describe how the bq2060 calculates reported battery and individual cell voltages, the following abbreviations

and designations are used:

VCELL₁–4 = voltages at the input pins of the bq2060

VCELL1–4 = reported cell voltages

Vnl–4 = voltages at the different series nodes in the battery

Voltage() = reported battery voltage

V_sr= voltage across the sense resistor

The reported voltages measurements, Voltage() and VCELL1–4, may be calibrated by adjusting five 8- or 16-bit

registers in EEPROM: ADC Offset in EE0x62, ADC Voltage Gain in EE 0x66–0x67, Cell 2 Calibration Factor in

EE 0x63, Cell 3 Calibration Factor in EE 0x64, and Cell 4 Calibration Factor in EE 0x65.

The bq2060 first computes the node voltages Vnl, Vn2, Vn3, and Vn4. The node voltages are inputs to the volt-

age dividers to the VCELL₁through VCELL₄input pins of the bq2060. The bq2060 computes node voltages to

calculate the five reported voltages by the bq2060: Voltage(), VCELL1, VCELL2, VCELL3, and VCELL4.

An ADC Voltage Gain factor of 20,000 is the nominal value when using the recommended cell-voltage division

ratios of 16:1 on the VCELL₄and VCELL₃inputs and 8:1 on the VCELL₂and VCELL₁inputs. The bq2060

subtracts the voltage across the sense resistor from the measurements so that the reported voltages reflect the

cell-stack voltages only.

The bq2060 compute the node voltages as

ADC Voltage Gain

65536

VCELL 32768

_{Vn1 +}ƪ

_{) ADC Offset}ƫ

ƪ

ƫ

1250

(27)

(28)

VCELL 32768

ADC Voltage Gain ) 8 (Cell 2 CalibrationFactor)

_{Vn2 +}ƪ

ƪ

ƫ

1250

65536

VCELL 32768

_{Vn3 +}ƪ

1250

2

ƪ

ƫ

ƪ ƫ

ADC Voltage Gain ) 8 (Cell 3 CalibrationFactor)

65536

(29)

(30)

VCELL 32768

_{Vn4 +}ƪ

_{) ADC Offset}ƫ

1250

ADC Voltage Gain ) 8 (Cell 4 CalibrationFactor)

2

ƪ

ƫ

ƪ ƫ

65536

Note: With LCC1-LCC0 = 00, Cell 4 Calibration Factor = 0.

ADC Offset adjusts the ADC reading for voltage and current measurements. ADC Offset is a signed 8-bit value

that cancels offset present in the circuit with no potential or current flow. ADC Offset is typically set between -20

and 20.

50

bq2060

www.ti.com

SLUS035E–JANUARY 2000–REVISED OCTOBER 2005

The bq2060 uses the computed node voltages to calculate the reported voltages. It does not compute reported

cell voltages greater than the selected number of nodes. If no individual cell voltages are to be measured,

LCC1–LCC0 should be set to 00 and the top of the battery stack should be connected to a voltage divider to the

VCELL₄input.

The bq2060 computes the reported voltages as

Voltage() = Vn4(LCC1–LCC0 = 11 or 00) – V_sr

Voltage() = Vn3(LCC1–LCC0 = 10) – V_sr

Voltage() = Vn2 (LCC1–LCC0 = 01) – V_sr

VCELL4 = Vn4- Vn3

VCELL3 = Vn3- Vn2

VCELL2 = Vn2- Vn1

VCELL1 = Vn1- V_sr

Current

The bq2060 scales Current() to mA units by the 16-bit value ADC Sense Resistor Gain in EE 0x68–0x69.

Adjusting ADC Sense Resistor Gain from its nominal value provides a method to calibrate the current readings

for variances in the ADC gain, internal voltage reference, and sense resistor value. The bq2060 calculates

Current() by

Current +

ƪ

ƫ

ADC Reading ) ADC Offset ADC Sense Resistor Gain

16384

(31)

The nominal value for ADC Sense Resistor Gain is given by Equation 4.

VFC

To calibrate the coulomb counting measurement for VFC gain errors and sense resistor tolerance, the value of

VFC Sense Resistor Gain EE 0x6a-0x6b may be adjusted from its nominal value.

The nominal value of VFC Sense Resistor Gain is given by Equation 5.

The bq2060 VFC circuit can introduce a signal opposite in sign from that of the inherent device and circuit offset

to cancel this error. The offset calibration routine is initiated with commands to ManufacturerAccess().

The bq2060 calculates the offset with the calibration routine and stores the calibration value using the least 21

bits of VFC Offset in EE 0x5e–0x60.

The least 20 bits store the offset calibration value (OCV). The sign of the offset calibration value is positive if the

21st bit is 0.

0.6 V

OCV +

VFC Offsets * 0

(32)

Temperature

The bq2060 uses Temperature Offset in EE 0x61 to calibrate the Temperature() function for offset. The required

offset adjustment, TOFF (C), sets Temperature Offset according to the equation

Temperature Offset

TOFF 10

(33)

where

–12.8 ≤ TOFF ≤ 12.7

CONSTANTS AND STRING DATA

EEPROM Constants

Check/Byte 1 EE 0x00–0x01 and Check Byte 2 EE 0x7e–0x7f must be programmed to 0x3c7f and 0xa55a,

respectively.

51

bq2060

www.ti.com

SLUS035E–JANUARY 2000–REVISED OCTOBER 2005

Specification Information

Specification Information EE 0x14–0x15 stores the default value for the SpecificationInfo() function. It is stored in

EEPROM in the same format as the data returned by the SpecificationInfo().

Manufacture Date

Manufacture Date EE 0x16–0x17 stores the default value for the ManufactureDate() function. It is stored in

EEPROM in the same format as the data returned by the ManufactureDate().

Serial Number

Serial Number EE 0x18–0x19 stores the default value for the SerialNumber() function. It is stored in EEPROM in

the same format as the data returned by the SerialNumber().

Manufacturer Name Data

Manufacturer Name Length EE 0x20 stores the length of the desired string that is returned by the

ManufacturerName() function. Locations EE 0x21–0x2a store the characters for ManufacturerName() in ASCII

code.

Device Name Data

Device Name Length EE 0x30 stores the length of the desired string that is returned by the DeviceName()

function. Locations EE 0x31-0x37 store the characters for DeviceName() in ASCII code.

Device Chemistry Data

Device Chemistry Length EE 0x40 stores the length of the desired string that is returned by the

DeviceChemistry() function. Locations EE 0x41–0x44 store the characters for DeviceChemistry() in ASCII code.

Manufacturers Data Length

Manufacturers Data Length EE 0x50 stores the length of the desired number of bytes that is returned by the

ManufacturersData() function. It should be set to 7.

52

PACKAGE MATERIALS INFORMATION

www.ti.com

26-Jan-2013

TAPE AND REEL INFORMATION

*All dimensions are nominal

Device

Package Package Pins

Type Drawing

SPQ

Reel

A0

B0

K0

P1

W

Pin1

Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant

(mm) W1 (mm)

BQ2060SS-E207TR-EP

BQ2060SS-E411TR

SSOP

DBQ

28

2500

330.0

16.4

6.5

10.3

2.1

8.0

16.0

Q1

Pack Materials-Page 1

PACKAGE MATERIALS INFORMATION

www.ti.com

26-Jan-2013

*All dimensions are nominal

Device

Package Type Package Drawing Pins

SPQ

Length (mm) Width (mm) Height (mm)

BQ2060SS-E207TR-EP

BQ2060SS-E411TR

SSOP

DBQ

28

2500

367.0

38.0

Pack Materials-Page 2

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