BQ2060A-E619DBQG4_技术文档

bq2060A

SBS v1.1-Compliant Gas Gauge IC

bq2060A provides LED drivers and a

push-button input to depict remaining

Features

General Description

battery capacity from full to empty in

The bq2060A SBS-Compliant Gas

20% or 25% increments with a 4 or

Ga u ge I C for ba t t er y p a ck or

5-segment display.

> ^{Provides accurate measurement}

of a va ila ble ch a r ge in N iCd ,

N iMH , Li-I on , a n d lea d -a cid

batteries

in-system installation maintains an

accurate record of available charge in

rechargeable batteries. The bq2060A

monitors capacity and other critical

battery parameters for NiCd, NiMH,

Li-Ion, and lead-acid chemistries.

The bq2060A uses a V-to-F converter

with automatic offset error correction

for charge and discharge counting.

For voltage, temperature, and current

r epor t in g, t h e bq2060A u ses a n

A-to-D converter. The onboard ADC

also monitors individual cell voltages

in a Li-Ion battery pack and allows

the bq2060A to generate control sig-

nals that may be used in conjunction

with a pack supervisor to enhance

pack safety.

The bq2060A works with an external

EEPROM. The EEPROM stores the

configuration information for the

bq2060A, such as the battery’s chem-

istry, self-discharge rate, rate com-

pensation factors, measurement cali-

bration, and design voltage and ca-

pacity. The bq2060A uses the pro-

grammable self-discharge rate and

other compensation factors stored in

the EEPROM to accurately adjust re-

maining capacity for use and standby

conditions based on time, rate, and

temperature. The bq2060A also auto-

matically calibrates or learns the true

battery capacity in the course of a dis-

ch a r ge cycle fr om n ea r -fu ll t o

near-empty levels.

> ^{Su ppor t s SBS Sm a r t Ba t t er y}

Data Specification v1.1

> ^{Supports the 2-wire SMBus v1.1}

in t er fa ce wit h P E C or 1-wir e

HDQ16

> ^{Reports individual cell voltages}

> ^{Monitors and provides control to}

ch a r ge a n d disch a r ge F E Ts in

Li-Ion protection circuit

> ^{P r ovides 15-bit r esolu t ion for}

voltage, temperature, and cur-

rent measurements

> ^{Mea su r es ch a r ge flow u sin g a}

V-to-F converter with offset of

less than 16µV after calibration

The bq2060A supports the smart bat-

tery data (SBData) commands and

charge-control functions. It communi-

cates data using the system manage-

ment bus (SMBus) 2-wire protocol or

the Benchmarq 1-wire HDQ16 proto-

col. The data available include the

battery’s remaining capacity, temper-

ature, voltage, current, and remain-

in g r u n -t im e p r ed ict ion s . Th e

The REG output regulates the operat-

ing voltage for the bq2060A from the

battery cell stack using an external

JFET.

> ^{Consumes less than 0.5mW oper-}

ating

> ^{Drives a 4- or 5-segment LED}

display for remaining capacity in-

dication

> ^{28-pin 150-mil SSOP}

Pin Connections

Pin Names

DFC

CFC

Discharge FET control

Charge FET control

Cell voltage divider

HDQ16 Serial communication

input/output

HDQ16

28

1

SMBC

ESCL

ESDA

27

26

2

3

SMBD

VCELL

ESCL

ESDA

Serial memory clock

4

3

2

1

VON

control

4

VCELL

RBI

25

24

23

22

21

20

19

18

17

16

15

Serial memory data and

address

5

REG

THON

TS

Thermistor bias control

Thermistor voltage input

Current sense input

V

OUT

6

RBI

Register backup input

Regulator output

EEPROM supply output

Supply voltage

V

CC

7

SR

1

V

SS

8

9

SR

2

REG

DISP

LED

SRC

TS

SRC

10

11

12

13

14

1

V

OUT

CC

SR –

1

SR

2

Charge-flow sense resistor

inputs

LED

THON

CVON

CFC

DFC

2

3

4

5

LED

Ground

VCELL – Single-cell voltage inputs

SS

1

VCELL

SMBD

SMBC

4

DISP

Display control input

28-Pin 150-mil SSOP

SMBus data

SMBus clock

LED – LED display segment outputs

1

LED

5

28PN2060.eps

SLUS500A–OCTOBER 2001–REVISED MAY 2002

1

bq2060A

Disch ar ge FET con tr ol ou tpu t

DF C

Pin Descriptions

Output to control the discharge FET in the

Li-Ion pack protection circuitry

Ser ial com m u n ication in pu t/ou tpu t

HDQ16

Ch ar ge FET con tr ol ou tpu t

CF C

Open-drain bidirectional communications

port

Output to control the charge FET in the

Li-Ion pack protection circuitry

Ser ia l m em or y clock

ESCL

Cell voltage divider con tr ol ou tpu t

CVON

Output to clock the data transfer between

the bq2060A and the external nonvolatile

configuration memory

Output control for external FETs to connect

the cells to the external voltage dividers

during cell voltage measurements

ESDA

RBI

Ser ial m em or y data an d addr ess

Th er m istor bias con tr ol ou tpu t

THON

Bidirectional pin used to transfer address

and data to and from the bq2060A and the

external nonvolatile configuration memory

Output control for external FETs to connect

the thermistor bias resistor during a tempera-

ture measurement

Register backu p in pu t

Th er m istor voltage in pu t

TS

Input that provides backup potential to the

bq2060A registers during periods of low op-

erating voltage. RBI accepts a storage ca-

pacitor or a battery input.

Input connection for a thermistor to monitor

temperature

Cu r r en t sen se voltage in pu t

Input to monitor instantaneous current

Sen se r esistor in pu ts

SRC

REG

Regu lator ou tpu t

Output to control an n-J FET for V_CCregu-

lation to the bq2060A from the battery po-

tential

SR₁–

SR₂

Input connections for a small value sense

resistor to monitor the battery charge and

discharge current flow

Su pply ou tpu t

V_OUT

Output that supplies power to the external

EEPROM configuration memory

Sin gle-cell voltage in pu ts

VCELL₁–

VCELL₄

Su pply voltage in pu t

Gr ou n d

V_CC

V_SS

Inputs that monitor the series element cell

voltages

SMBu s data

SMBD

SMBC

Display con tr ol in pu t

DISP

Open-drain bidirectional pin used to trans-

fer a ddr ess a n d da t a t o a n d fr om t h e

bq2060A

I n p u t t h a t con t r ols t h e LE D d r iver s

LED₁–LED₅

LED display segm en t ou tpu ts

LED₁–

LED₅

SMBu s clock

Outputs that each may drive an external

LED

Open drain bidirectional pin used to clock

the data transfer to and from the bq2060A

2

bq2060A

The VFC measures bipolar signals up to 250mV. The

Functional Description

bq2060A detects charge activity when V_SR= V_SR2

–

V_SR1is positive and discharge activity when V_SR= V_SR2

– V_{S R 1}is n ega t ive. Th e bq2060A con t in u ou s ly

in t egr a t es t h e sign a l over t im e u sin g a n in t er n a l

cou n t er . Th e fu n da m en t a l r a t e of t h e cou n t er is

6.25µVh.

General Operation

The bq2060A determines battery capacity by monitoring

the amount of charge input or removed from a recharge-

able battery. In addition to measuring charge and dis-

charge, the bq2060A measures battery voltage, tempera-

ture, and current, estimates battery self-discharge, and

monitors the battery for low-voltage thresholds. The

bq2060A 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.

Offset Calibration

The bq2060A provides an auto-calibration feature to can-

cel the voltage offset error across SR₁and SR₂for maxi-

mum charge measurement accuracy. The calibration rou-

t in e is in it ia t ed by is s u in g

a

com m a n d t o

ManufacturerAccess(). The bq2060A is capable of auto-

matic offset calibration down to 6.25µV. Offset cancellation

resolution is less than 1µV.

Digital Filter

Figure 1 shows a typical bq2060A-based battery-pack

application. The circuit consists of the LED display,

volt a ge a n d t em per a t u r e m ea su r em en t n et wor k s,

EEPROM connections, a serial port, and the sense resis-

tor. The EEPROM stores basic battery-pack configura-

tion information and measurement-calibration values.

Th e E E P ROM m u st be pr ogr a m m ed pr oper ly for

bq2060A operation. Table 9 shows the EEPROM mem-

ory map and outlines the programmable functions avail-

able in the bq2060A.

The bq2060A does not measure charge or discharge

counts below the digital filter threshold. The digital fil-

t er t h r esh old is pr ogr a m m ed in t h e E E P ROM a n d

should be set sufficiently high to prevent false signal de-

tection with no charge or discharge flowing through the

sense resistor.

Voltage

While monitoring SR₁and SR₂for charge and discharge

currents, the bq2060A monitors the battery-pack poten-

t ia l a n d t h e in dividu a l cell volt a ges t h r ou gh t h e

VCELL₁–VCELL₄pins. The bq2060A measures the pack

voltage and reports the result in Voltage(). The bq2060A

can also measure the voltage of up to four series ele-

ments in a battery pack. The individual cell voltages

are stored in the optional Manufacturer Function area.

Th e bq2060A a ccept s a n NTC t h er m ist or (Sem it ec

103AT) for temperature measurement. The bq2060A

u ses t h e t h er m ist or t em per a t u r e t o m on it or ba t-

tery-pack temperature, detect a battery full-charge con-

dition, and compensate for self-discharge and charge/dis-

charge battery efficiencies.

Measurements

The VCELL₁–VCELL₄inputs are divided down from the

cells using precision resistors, as shown in Figure 1. The

maximum input for VCELL₁–VCELL₄is 1.25V with re-

spect to V_SS. The voltage dividers for the inputs must be

set so that the voltages at the inputs do not exceed the

1.25V limit under all operating conditions. Also, the di-

vider ratios on VCELL₁–VCELL₂must be half of that of

VCELL₃–VCELL₄. To reduce current consumption from

The bq2060A uses a fully differential, dynamically bal-

anced voltage-to-frequency converter (VFC) for charge

measurement and a sigma delta analog-to-digital con-

verter (ADC) for battery voltage, current, and tempera-

ture measurement.

Voltage, current, and temperature measurements are

made every 2–2.5 seconds, depending on the bq2060A the battery, the CVON output may used to connect the

operating mode. Maximum times occur with compen-

sated EDV, mWh mode, and maximum allowable dis-

charge rate. Any AtRate computations requested or

scheduled (every 20 seconds) may add up to 0.5 seconds

to the time interval.

divider to the cells only during measurement period.

CVON is high impedance for 250ms (12.5% duty cycle)

when the cells are measured, and driven low otherwise.

(See Table 1.)

The SRC input of the bq2060A 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 ±250mV as shown in Table 2.

Charge and Discharge Counting

The VFC measures the charge and discharge flow of the

ba t t er y by m on it or in g a sm a ll-va lu e sen se r esist or

between the SR₁and SR₂pins as shown in Figure 1.

3

bq2060A

Figure 1. Battery Pack Application Diagram–LED Display and Series Cell Monitoring

4

bq2060A

Table 1. Example VCELL₁–VCELL₄Divider

and Input Range

Current

The SRC input of the bq2060A 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 ±250mV, as shown in Table 2.

Voltage Division Full-Scale Input

Voltage Input

VCELL₄

Ratio

(V)

16

8

20.0

10.0

VCELL₃

Temperature

VCELL₂

The TS input of the bq2060A in conjunction with an

NTC thermistor measures the battery temperature as

shown in Figure 1. The bq2060A reports temperature in

Temperature(). THON may be used to connect the bias

source to the thermistor when the bq2060A samples the

TS input. THON is high impedance for 60ms when the

temperature is measured, and driven low otherwise.

VCELL₁

8

Table 2. SRC Input Range

Gas Gauge Operation

Sense Resistor (W)

Full-Scale Input

(A)

General

The operational overview in Figure 2 illustrates the gas

gauge operation of the bq2060A. Table 3 describes the

bq2060A registers.

0.02

0.03

0.05

0.10

±12.5

±8.3

±5.0

±2.5

The bq2060A accumulates a measure of charge and

discharge currents and estimates self-discharge of the

Figure 2. bq2060A Operational Overview

5

bq2060A

Table 3. bq2060A Register Functions

Command Code

SMBus

Access

Function

Units

SMBus

0x00

HDQ16

0x00

ManufacturerAccess

RemainingCapacityAlarm

RemainingTimeAlarm

BatteryMode

read/write

read

n/a

mAh, 10mWh

minutes

n/a

0x01

0x02

0x03

AtRate

0x04

mA, 10mW

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, 10mWh

minutes

mA

RelativeStateOfCharge

AbsoluteStateOfCharge

RemainingCapacity

FullChargeCapacity

RunTimeToEmpty

AverageTimeToEmpty

AverageTimeToFull

ChargingCurrent

ChargingVoltage

Battery Status

CycleCount

0x0d

read

0x0e

read

0x0f

read

0x10

read

0x11

read

0x12

read

0x13

read

0x14

read

0x15

read

mV

0x16

read

n/a

0x17

read

cycles

mAh, 10mWh

mV

DesignCapacity

DesignVoltage

SpecificationInfo

ManufactureDate

SerialNumber

0x18

read

0x19

read

0x1a

read

n/a

0x1b

read

n/a

0x1c

read

integer

-

Reserved

0x1d–0x1f

0x20

0x1d - 0x1f

0x20–0x25

0x28–0x2b

0x30–0x32

0x38–0x3b

0x2f (LSB)

0x2f (MSB)

0x3c

-

ManufacturerName

DeviceName

read

string

n/a

0x21

read

DeviceChemistry

ManufacturerData

Pack Status

0x22

read

0x23

read

0x2f (LSB)

0x2f (MSB)

0x3c

read/write

Pack Configuration

VCELL4

n/a

mV

VCELL3

0x3d

mV

VCELL2

0x3e

mV

VCELL1

0x3f

mV

6

bq2060A

battery. The bq2060A compensates the charge current

measurement for temperature and state-of-charge of the

battery. It also adjusts the self-discharge estimation

based on temperature.

charge capacity of the battery. The last measured dis-

charge of the battery is based on the value in the DCR

register after a qualified discharge occurs. Once up-

da t ed, t h e bq2060A wr it es t h e n ew F CC va lu e t o

EEPROM in mAh to Last Measured Discharge. FCC

represents the full battery reference for the relative dis-

play mode and relative state of charge calculations.

The main counter RemainingCapacity() (RM) represents

the available capacity or energy in the battery at any

given t im e. Th e bq2060A a dju st s RM for ch a r ge,

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.

Discharge Count Register (DCR)

The DCR register counts up during discharge, independ-

ent 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 bq2060A 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.

The FullChargeCapacity() (FCC) register represents the

last measured full discharge of the battery. It is used as

the battery’s full-charge reference for relative capacity

indication. The bq2060A updates FCC when the battery

undergoes a qualified discharge from nearly full to a low

battery level. FCC is accessible through the serial com-

munications ports.

The Discharge Count Register (DCR) is a non-accessible

register that only tracks discharge of the battery. The

bq2060A uses the DCR register to update the FCC regis-

ter if the battery undergoes a qualified discharge from

nearly full to a low battery level. In this way, the

bq2060A learns the true discharge capacity of the bat-

tery under system use conditions.

Capacity Learning (FCC Update) and Qualified

Discharge

The bq2060A 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 program-

mable nearly full and low battery levels, according to

the following equation:

Main Gas Gauge Registers

RemainingCapacity() (RM)

FCC(new)=DCR(final)=

(1)

DCR(initial)+ measured discharge to EDV2

+(FCC´ Battery Low%)

RM represents the remaining capacity in the battery.

The bq2060A computes RM in either mAh or 10mWh de-

pending on the selected mode.

where

Battery Low % =(value stored in EE 0x54)¸ 2.56

On initialization, the bq2060A 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 bq2060A

calibrates RM at three low-battery-voltage thresholds,

E DV2, E DV1, a n d E DV0 a n d t h r ee pr ogr a m m a ble

midrange thresholds VOC25, VOC50, and VOC75. This

provides a voltage-based calibration to the RM counter.

A qualified discharge occurs if the battery discharges

from RM ≥ FCC - Near Full 2 to the EDV2 voltage

*

threshold with the following conditions:

n

No valid charge activity occurs during the discharge

period. A valid charge is defined as an input of

10mAh into the battery.

n

No more than 256mAh of self-discharge and/or light

discharge estimation occurs during the discharge

period.

DesignCapacity() (DC)

The DC is the user-specified battery full capacity. It is

calculated from Pack Capacity EE 0x3a–0x3b and is rep-

resented in mAh or 10mWh. It also represents the

full-battery reference for the absolute display mode.

n

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 256mV when the

bq2060A detected EDV2.

FullChargeCapacity() (FCC)

FCC is the last measured discharge capacity of the bat-

tery. It is represented in either mAh or 10mWh depend-

ing on the selected mode. On initialization, the bq2060A

sets FCC to the value stored in Last Measured Dis-

charge EE 0x38–0x39. During subsequent discharges,

the bq2060A updates FCC with the last measured dis-

n

No midrange voltage correction occurs during the

discharge period.

There is no overload condition when voltage ≤ EDV2

threshold

7

bq2060A

FCC cannot be reduced by more than 256mAh or in-

creased by more than 512mAh during any single update

cycle. The bq2060A saves the new FCC value to the

EEPROM within 4s of being updated.

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 de-

grees 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):

End-of-Discharge Thresholds and Capacity Cor-

rection

The bq2060A monitors the battery for three low-voltage

thresholds, EDV0, EDV1, and EDV2. The EDV thresh-

olds are programmed in EDVF/ EDV0 EE 0x72–0x73,

E MF / E DV1 E E 0x74–0x75, a n d E DV C1/ C0 F a c-

tor/ EDV2 EE 0x78–0x79. If the CEDV bit in Pack Con-

figuration is set, automatic EDV compensation is en-

abled and the bq2060A computes the EDV0, EDV1, and

EDV2 thresholds based on the values in EE 0x72–0x7d,

0x06, and the battery’s current discharge rate, tempera-

ture, capacity, and cycle count. The bq2060A disables

EDV detection if Current() exceeds the Overload Current

threshold programmed in EE 0x46 - EE 0x47. The

bq2060A resumes EDV threshold detection after Cur-

rent() drops below the overload current threshold. Any

EDV threshold detected will be reset after 10mAh of

charge are applied.

Self-Discharge Rate

₄¹Y% per day

Temperature ( C)

Temp < 10

₂¹Y% per day

10 ≤ Temp <20

20 ≤ Temp <30

30 ≤ Temp <40

40 ≤ Temp <50

50 ≤ Temp <60

60 ≤ Temp <70

70 ≤ Temp

Y% per day

2Y% per day

4Y% per day

8Y% per day

16Y% per day

32Y% per day

The bq2060A uses the thresholds to apply voltage-based

corrections to the RM register according to Table 4.

The interval at which RM is reduced is given by the fol-

lowing equation, where n is the appropriate factor of 2

1

4

(n =

,

₂¹, 1, 2, . . . ):

Table 4. State of Charge Based

on Low Battery Voltage

(2)

640·13500

Self -Discharge Update Time =

seconds

256·n ·(Y% per day)

Threshold

EDV0

State of Charge in RM

0%

3%

The timer that keeps track of the self-discharge update

time is halted whenever charge activity is detected. The

t im er is r eset t o zer o if t h e bq2060A r ea ch es t h e

RemainingCapacity()=FullChargeCapacity() condition

while charging.

EDV1

EDV2

Battery Low %

The bq2060A adjusts RM as it detects each threshold. If

the voltage threshold is reached before the correspond-

ing capacity on discharge, the bq2060A 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 bq2060A prevents RM from

decreasing until the battery voltage reaches the corre-

sponding threshold, but only on a full learning-cycle dis-

charge (VDQ = 1). The EDV1 threshold is ignored if Mis-

cellaneous Options bit 7 = 1.

E x a m p l e : I f T = 35°C (n = 2) a n d p r ogr a m m ed

self-discharge rate Y is 2.5 (2.5% per day at 25°C), the

bq2060A reduces RM by RM/256 (0.39%) every

(3)

640·13500

= 6750seconds

256·n· (Y% per day)

This means that a 0.39% reduction of RM will be made

12.8 times per day to achieve the desired 5% per day re-

duction at 35°C.

Self-Discharge

The bq2060A estimates the self-discharge of the battery

to maintain an accurate measure of the battery capacity

d u r in g p er iod s of in a ct ivit y. Th e a lgor it h m 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 bq2060A

makes the fixed reduction at a varying time interval

that is adjusted to achieve the desired self-discharge

Figure 3 illustrates how the self-discharge estimate al-

gorithm adjusts RemainingCapacity() vs. temperature.

Light Discharge or Suspend Current

Compensation

The bq2060A can be configured in two ways to compen-

sate for small discharge currents that produce a signal

8

bq2060A

Threshold

VOC25

Associated State of Charge

25%

50%

75%

VOC50

VOC75

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

–64mA and 0. For a correction to occur, the bq2060A

must also detect the need for correction during two adja-

cent measurements separated by 20s. The second mea-

surement is not required if the first measurement is im-

mediately after a device reset. The bq2060A makes

midrange corrections as shown in Table 5.

Figure 3. Self-Discharge at 2.5%/Day @25C

Charge Control

below the digital filter. First, the bq2060A can decrement

RM and DCR at a rate determined by the value stored in

Light Discharge Current EE 0x2b when it detects no dis-

charge activity and the SMBC and SMBD lines are high.

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

Charging Voltage and Current Broadcasts

The bq2060A supports SBS charge control by broadcasting

the ChargingCurrent() and ChargingVoltage() to the

Smart Charger address. The bq2060A broadcasts the re-

quests every 10s. The bq2060A updates the values used

in 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 pro-

grammed in Charging Voltage EE 0x0a-0x0b.

Alternatively, the bq2060A can be configured to disable

the digital filter for discharge when the SMBC and

SMBD lines are high. In this way, the digital filter will

not mask the leakage current signal. The bq2060A is

configured in this mode by setting the NDF bit in Con-

trol Mode.

The bq2060A internal charge control is compatible with

popu la r r ech a r gea ble ch em ist r ies. Th e pr im a r y

charge-termination techniques include a change in tem-

perature over a change in time (∆T/∆t) and current

taper, for nickel-based and Li-Ion chemistries, respec-

tively. The bq2060A also provides pre-charge qualifica-

tion and a number of safety charge suspensions based

on current, voltage, temperature, and state of charge.

Midrange Capacity Corrections

The bq2060A applies midrange capacity corrections

when the VCOR bit is set in Pack Configuration. The

bq2060A adjusts RM to the associated percentage at

t h r ee differ en t volt a ge levels VOC25, VOC50, a n d

VOC75. The VOC values represent the open circuit bat-

tery voltage at which RM corresponds to the associated

state of charge for each threshold.

Table 5. Midrange Corrections

Condition

Result

≥ VOC75 and RelativeStateOfCharge() ≤ 63%

< VOC75 and RelativeStateOfCharge() ≥ 87%

RelativeStateOfCharge()→75%

RelativeStateOfCharge()→50%

RelativeStateOfCharge()→25%

≥VOC50 and RelativeStateOfCharge() ≤ 38%

Voltage()

<VOC50 and RelativeStateOfCharge() ≥ 62%

≥ VOC25 and RelativeStateOfCharge() ≤ 13%

< VOC25 and RelativeStateOfCharge() ≥ 37%

9

bq2060A

is no longer being charged (DISCHARGING bit set in

BatteryStatus()). The bq2060A continues to broadcast

zero charging current until the overvoltage condition is

cleared. The overvoltage condition is cleared when the

Alarm Broadcasts to Smart Charger and Host

If any of the bits 8–15 in BatteryStatus() is set, the

bq2060A broadcasts an AlarmWarning() message to the

Host address. If any of the bits 12–15 in BatteryStatus() is

set, the bq2060A also sends an AlarmWarning() message

to the Smart Charger address. The bq2060A repeats the

AlarmWarning() message every 10s until the bits are

cleared.

measured

battery

voltage

drops

below

the

ChargingVoltage() plus the Overvoltage Margin or when

the CVOV bit is reset.

n

Over -Tem p er a tu r e: 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 bq2060A sets the ChargingCurrent() to

zero and sets the OVER_TEMP_ALARM and

Pre-Charge Qualification

The bq2060A sets ChargingCurrent() to the pre-charge

r a t e a s p r ogr a m m ed in P r e-Ch a r ge Cu r r en t E E

0x1e-0x1f under the following conditions:

TERMINATE_CHARGE_

ALARM

bit

in

BatteryStatus() and the CVOV bit in Pack Status.

The over-temperature condition is cleared when

n

Volta ge:

The bq2060A requests the pre-charge

Temperature() is equal to or below (Max T

– 5°C).

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 bq2060A

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.

The temperature set by MaxT is increased by 16°C if

bit 5 in Miscellaneous Options is set.

n

Over ch a r ge: 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 bq2060A sets

the ChargingCurrent() to zero and sets the

OVER_CHARGED_ALARM, TERMINATE_CHARGE_

n

Tem p er a tu r e:

The bq2060A requests the

pre-charge rate when Temperature() is between 0°C

and 5°C. Temperature() must rise above 5°C before

the bq2060A requests the fast-charge rate.

ALARM,

and

FULLY_CHARGED

bits

in

BatteryStatus(). The bq2060A 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 bq2060A 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.

Charge Suspension

The bq2060A may temporarily suspend charge if it de-

tects a charging fault. A charging fault includes the fol-

lowing conditions.

n

Over cu r r en t: An overcurrent condition exists when

the bq2060A measures the charge current to be more

than

the

Overcurrent

Margin

above

the

n

Un d er -Tem p er a tu r e:

An

under-temperature

ChargingCurrent(). Overcurrent Margin is programmed

in EE 0x49. On detecting an overcurrent condition, the

bq2060A sets the ChargingCurrent() to zero and sets the

condition exists if Temperature() < 0°C. On detecting

an under temperature condition, the bq2060A sets

ChargingCurrent() to zero. The bq2060A sets

ChargingCurrent() to the appropriate pre-charge rate

or fast-charge rate when Temperature() ≥ 0°C.

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.

Primary Charge Termination

T h e b q 2 0 6 0 A t e r m in a t e s ch a r ge if it d e t e ct s a

charge-termination condition. A charge-termination

condition includes the following.

n

Over voltage: An overvoltage condition exists when the

bq2060A 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-/ Overoltage. Overvoltage

Margin is programmed in EE 0x48 and Cell Under/ Over

Voltage in EE 0x4a (least significant nibble). On

detecting an overvoltage condition, the bq2060A sets the

n

∆T/∆t : For ∆T/∆t, the bq2060A 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 (20s-320s). Typical settings for 1°C/minute

include 2°C/120s and 3°C/180s. 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.

ChargingCurrent()

TERMINATE_CHARGE_ALARM bit in BatteryStatus().

The bq2060A clears the TERMINATE_

CHARGE_ALARM bit when it detects that the battery

to

zero

and

sets

the

10

bq2060A

LED bit in Control Mode programs the 4 or 5 LED op-

tion. A 5th LED can be used with the 4 LED display op-

tion to show when the battery capacity is ≥ to 100%.

In addition to the ∆T/∆t timer, a hold-off timer starts

when the battery is being charged at more than

255mA and the temperature is above 25°C. Until this

timer expires, ∆T/∆t detection is suspended. If

Current() drops below 256mA or Temperature() below

25°C, the hold-off timer resets and restarts only when

the current and temperature conditions are met again.

The hold-off timer is programmable (20s – 320s) with

Holdoff Time value in EE 0x4f.

Activation

Th e d is p la y m a y be a ct iva t ed a t a n y t im e 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 dis-

n

Current Taper: For current taper, ChargingVoltage()

must be set to the pack voltage desired during the

constant-voltage phase of charging. The bq2060A 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

and starts a four-second display timer. The timer

play

expires and turns off the display whether

DISP was

brought low momentarily or held low indefinitely. Reac-

tivation of the display requires that the DISP input re-

turn to a logic-high state and then transition low again.

The second high-to-low transition must occur after the

display timer expires. The bq2060A requires the DISP

input to remain stable for a minimum of 250ms to detect

the logic state.

below

a

threshold determined by Current Taper

Threshold in EE 0x4e, for at least 80s. The bq2060A uses

the VFC to measure current for current taper

termination. The current must also remain above

0.5625/R_SmA to qualify the termination condition.

If the EDV0 bit is set, the bq2060A disables the LED

display. The display is also disabled during a VFC cali-

br a t ion a n d sh ou ld be t u r n ed off befor e en t er in g

low-power storage mode.

Once the bq2060A detects a primary charge termination,

it s et s t h e TE RMI N ATE _CH ARGE _ALARM a n d

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 bq2060A also sets RM

to a programmed percentage of FCC, provided that

R e la t ive S t a t e O fC h a r ge () is b e low t h e d e s ir e d

percentage of FCC and the CSYNC bit in Pack Configu-

ration EE 0x3f is set. If the CSYNC bit is not set and

RelativeStateOfCharge() is less than the programmed

p e r ce n t a ge of F C C , t h e b q 2 0 6 0 A cle a r s t h e

FULLY_CHARGED bit in BatteryStatus(). The pro-

grammed percentage of FCC, Fast Charge Termination

%, is s e t in E E 0 x4 b . T h e b q 2 0 6 0 A cle a r s t h e

FULLY_CHARGED bit when RelativeStateOfCharge()

is less than the programmed Fully Charged Clear %.

The bq2060A broadcasts the fast-charge rate when the

FULLY_CHARGED bit is cleared and voltage and tem-

per a t u r e per m it . Th e bq2060A clea r s t h e TE RMI-

NATE_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 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. Tables 7A and 7B show

the display operation.

In either mode, the bq2060A blinks the LED display if

R e m a in in gC a p a cit y() is le s s t h a n R e m a in in g

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

Secondary Protection for Li-Ion

The bq2060A has two pins, CFC and DFC, that can be

used for secondary override control of a Li-Ion protector

or for blowing a fuse to disable the battery pack. The

CFC pin is the Charge FET Control pin for secondary

protector control or for blowing a fuse. The DFC pin is

the Discharge FET Control pin for secondary protector

control. Discharge current can cause an override of the

CFC control, and charge current can cause an override

of the DFC control. Pack Status can read the CVOV

and CVUV status flags and can also read the true logic

state of the CFC and DFC pins.

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 in-

put. The bq2060A 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

bq2060A uses FCC as the full-battery reference; in abso-

lute mode, it uses DC.

The CVOV status flag is set if Voltage() ≥ Charging

Voltage() + Overvoltage Margin, any VCELL voltage ≥

Cell Overvoltage threshold, or if Temperature() ≥ MaxT.

When CVOV=1 and Miscellaneous Options bit 6 = 0, the

CFC pin is pulled low unless DISCHARGING bit in

Ba t t er ySt a t u s() is set or Tem per a t u r e() > S a fety

Overtemperature threshold. If Miscellaneous Options bit

6 = 1, the CPC pin is pulled low only if Temperature()

>Safety Overtemperature threshold.

The DMODE bit in Pack Configuration programs the

bq2060A for the absolute or relative display mode. The

11

bq2060A

Table 6. Alarm and Status Bit Summary

CC() State and

CC() = Fast or Pre-charge Current

Battery State

Conditions

BatteryStatus Bits Set

and/or Bits Cleared

C() < CC() + Overcurrent Margin

DISCHARGING = 1

C() ≥ CC() + Overcurrent

Overcurrent

CC() = 0, TCA = 1

TCA = 1

Margin

V() ≥ CV() + Overvoltage

Margin

VCELL1, 2, 3, or 4 > Cell

Over Voltage

Overvoltage

V() < CV() + Overvoltage Margin

Li-Ion cell voltage ≤ Cell Over Voltage

CC() = 0, CVOV = 1

CC() = 0, OTA = 1,

TCA = 1, CVOV = 1

Overtemperature

Overcharge

T() ≥ Max T

T() ≤ Max T - 5°C or T() ≤ 43°C

Capacity added after

RM() = FCC() ≥

Maximum Overcharge

CC() = 0, FC = 1

OCA = 1, TCA = 1

RSOC() < Fully Charged Cleared %

DISCHARGING = 1

0°C ≤ Τ() < 5°C, CC() = Pre-Charge

Current

Undertemperature

T() < 0°C

CC() = 0

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

DISCHARGING = 1 or termination

condition is no longer valid.

TCA = 1

V() ≤ EDV2

or

Fully discharged

Overdischarged

FD = 1

RSOC() > 20%

RM() < FCC() Battery

*

Low%

V() ≤ EDV0

TDA = 1

V() > EDV0

VCELL1, 2, 3 or 4 < Cell

TDA = 1, CVUV = 1

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

Under Voltage

RM() = 0

TDA = 1

RCA = 1

RTA = 1

RM() > 0

Low capacity

Low run-time

RM() < RCA()

ATTE() < RTA()

RM() ≥ RCA()

ATTE() ≥ RTA()

Note:

C() = Current(), CV() = ChargingVoltage(), CC() = ChargingCurrent(), V() = Voltage(), T() = Tempera-

ture(), 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.

12

bq2060A

Table 7A. Display Mode

Table 7B. Display Mode

Condition

Relative or

Absolute

5 LED Display Option

LED1 LED2 LED3 LED4 LED5

Condition

Relative or

Absolute

4 LED Display Option

LED1

LED2

LED3

LED4

StateOfCharge()

EDV0 = 1

<20%

OFF

ON

OFF OFF OFF

ON OFF OFF

OFF

ON

EDV0 = 1

<25%

OFF

ON

OFF

ON

OFF

ON

OFF

ON

≥20%, <40%

≥40%, <60%

≥60%, <80%

≥80%

≥25%, <50%

≥50%, <75%

≥75%

ON

OFF

ON

partial reset leaves MaxError, RELEARN_FLAG, and

RM u n ch a n ged. Th e bq2060A dela ys r ea din g t h e

EEPROM for 700ms after all resets to allow settling

The CVUV status flag is set if any VCELL voltage < Cell

Undervoltage threshold. When CVUV = 1, the DVC pin

is pulled low unless DISCHARGING bit in

BatteryStatus() is set or Temperature() is not set.

time for V_CC

.

Cell Undervoltage and Cell Overvoltage limits may be

programmed in the upper and lower nibbles of EE 0x4a.

Safety Overtemperature threshold may be programmed

in EE 0x09, and Miscellaneous Options is programmed

in EE 0x08.

Communication

The bq2060A includes two types of communica tion

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 bq2060A will not

pull these lines low if V_CCto the part is zero . HDQ16

should be pulled down with a 100KΩ resistor if not

used.

Low-Power Storage Mode

The bq2060A enters low-power mode 5– 8s after receiv-

ing the Enable Low-Power command. In this mode the

bq2060A consumes less than 10µA. A rising edge on

SMBC, SMBD, or HDQ16 restores the bq2060A to the

full operating mode. The bq2060A does not perform any

gas gauge functions during low-power storage mode.

The communication ports allow a host controller, an

SMBus compatible device, or other processor to access

the memory registers of the bq2060A. In this way a sys-

tem can efficiently monitor and manage the battery.

Device Reset

The bq2060A can be reset when power is applied or by

commands over the HDQ16 or SMBus. Upon reset, the

bq2060A initializes its internal registers with the infor-

mation contained in the configuration EEPROM. The

following command sequence initiates a full bq2060A re-

set:

SMBus

The SMBus interface is a command-based protocol. A

processor acting as the bus master initiates communica-

tion to the bq2060A by generating a START condition. A

START condition consists of a high-to-low transition of

the SMBD line while the SMBC is high. The processor

then sends the bq2060A device address of 0001011 (bits

7–1) plus a R/W bit (bit 0) followed by an SMBus com-

mand code. The R/W bit and the command code instruct

the bq2060A to either store the forthcoming data to a

register specified by the SMBus command code or out-

put 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 SMBus, the

most significant bit of a data byte is transmitted first.

Write 0xff5a to address 0x4f

Write 0x0000 to address 0x7d

Write 0x0080 to address 0x7d

A partial reset of the bq2060A occurs if step 1 is omitted

and all check-byte values previously loaded into RAM

are still correct. All initial RAM values are read from

EEPROM for both full and partial resets. A full reset

initializes MaxError = 100%, sets RELEARN_FLAG (bit

7) = 1 in Battery Mode, and initializes RM from EE

0x2c–2d (should be zero for rechargeable batteries). A

13

bq2060A

In some instances, the bq2060A acts as the bus master.

This occurs when the bq2060A broadcasts charging re-

quirements and alarm conditions to device addresses

0x12 (SBS Smart Charger) and 0x10 (SBS Host Control-

ler.)

= X⁸+ X²+ X¹+ 1. The PEC calculation includes all

bytes in the transmission, including address, command,

and data. The PEC calculation does not include AC-

KNOWLEDGE, NOT ACKNOWLEDGE, START, STOP,

and Repeated START bits.

For example, the host requests RemainingCapacity()

from the bq2060A. This includes the host following the

Read Word protocol. The bq2060A calculates the PEC

based on the following 5 bytes of data, assuming the re-

maining capacity of the battery is 1001mAh.

SMBus Protocol

The bq2060A supports the following SMBus protocols:

n

Read Word

Write Word

Read Block

n

Battery Address with R/W = 0: 0x16

Command Code for RemainingCapacity(): 0x0f

Battery Address with R/W = 1: 0x17

RemainingCapacity(): 0x03e9

A processor acting as the bus master uses the three pro-

tocols to communicate with the bq2060A. The bq2060A

acting as the bus master uses the Write Word protocol.

For 0x160f17e903, the bq2060A transmits a PEC of 0xe8

to the host.

The SMBD and SMBC pins are open drain and require

external pullup resistors.

PEC Enable in Master Mode

SMBus Packet Error Checking

PEC for master mode broadcasts to the charger, host, or

both can be enabled/disabled with the combination of

the bits HPE and CPE in Control Mode.

The bq2060A supports Packet Error Checking as a mech-

anism 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 deter-

mine if there is a communication error.

SMBus On and Off State

The bq2060A detects whether the SMBus enters the Off

State” by monitoring the SMBC and SMBD lines. When

both signals are continually low for at least 2.5s, the

bq2060A detects the Off State. When the SMBC and

SMBD lines go high, the bq2060A detects the On State

and can begin communication within 1ms. One-MΩ

pulldown resistors on SMBC and SMBD are recom-

mended for reliable Off State detection.

PEC Protocol

The bq2060A can receive or transmit data with or with-

out PEC. Figure 4 shows the communication protocol

for the Read Word, Write Word, and Read Block mes-

sages without PEC. Figure 5 includes PEC.

HDQ16

The HDQ16 interface is a command-based protocol. (See

Figure 6.) A processor sends the command code to the

bq2060A. 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 bq2060A either to

In the Write Word protocol, the bq2060A 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

bq2060A compares the value to its calculation. If the

PEC is correct, the bq2060A responds with an AC-

KNOWLEDGE. If it is not correct, the bq2060A re-

sponds with a NOT ACKNOWLEDGE and sets an error

code.

n

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

Output 16 bits of data from the specified register

n

With HDQ16, the least significant bit of a data byte

(command) or word (data) is transmitted first.

In the Read Word and Block Read, the host generates an

ACKNOWLEDGE after the last byte of data sent by the

bq2060A. The bq2060A then sends the PEC and the

host acting as a master-receiver generates a NOT AC-

KNOWLEDGE and a STOP condition.

A bit transmission consists of three distinct sections. The

first section starts the transmission by either the host or

the bq2060A 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 commu-

nication. The data bit is held for a period t_DH;DVto allow

the host processor or bq2060A to sample the data bit.

PEC Calculation

The basis of the PEC calculation is an 8-bit Cyclic Re-

dundancy Check (CRC-8) based on the polynomial C(X)

14

bq2060A

Figure 4. SMBus Communication Protocol without PEC

Figure 5. SMBus Communication Protocol with PEC

15

bq2060A

The final section is used to stop the transmission by re-

turning 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 un-

til a period t_CYCH;Bto allow time to ensure that the bit

transmission was stopped properly.

LEDs must be off before entering the low-power storage

mode as the display state remains unchanged.

The bq2060A clears the ManufacturerAccess() command

within 900ms of acknowledging the Enable Low-Power

Storage command. The VFC Calibration command may

be sent 900–5000ms after SMBus acknowledgment of

the Enable Low-Power Storage command. In this case,

the bq2060A delays entering storage mode until the cali-

bration process completes and the bq2060A stores the

new calibration values in EEPROM.

If a communication error occurs (e.g., t_CYCB> 250µs), the

host sends the bq2060A a BREAK to reinitiate the serial

interface. The bq2060A 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 bq2060A is

then ready to receive a command from the host proces-

sor.

0x062b SEAL: Instructs the bq2060A to restrict access

to those functions listed in Table 3. The bq2060A com-

pletes the seal function and clears ManufacturerAccess()

within 900ms of acknowledging the command.

The HDQ16 pin is open drain and requires an external

pullup resistor.

0x064d Ch a r ge Syn ch r on iza t ion : Instructs the

bq2060A t o u pda t e RM t o a per cen t a ge of F CC a s

defined in Fast Charge Termination %. The bq2060A

updates RM and clears ManufacturerAccess() within

900ms of acknowledging the command.

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 0–70°C.

)

0x0653 En a ble VF C Ca libr a tion : Instructs the un-

sealed bq2060A to begin VFC calibration. With this

command the bq2060A deselects the SR₁and SR2 inputs

and calibrates for IC offset only. It is best to avoid

charge or discharge currents through the sense resistor

during this calibration process.

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

Descr ip tion :

This function provides writable command codes to con-

trol the bq2060A 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.

0x067e Alter n a te VF C Ca libr a tion : Instructs the

unsealed bq2060A to begin VFC calibration. With this

command, the bq2060A does not deselect the SR₁and

SR₂inputs and does calibrate for IC and PCB offset.

Du r in g th is p r oced u r e n o ch a r ge or d isch a r ge cu r -

r en ts

0x0618 En a ble Low -P ow er Stor a ge Mod e: Activates

the low-power storage mode. The bq2060A enters the

storage mode after a 5–8s delay. The bq2060A accepts

other commands to ManufacturerAccess() during the

delay before entering low-power storage mode. The

During VFC calibration, the bq2060A disables the LED

display and accepts only the Stop VFC Calibration and

Figure 6. HDQ16 Communication Example

16

bq2060A

the SEAL comma nds to Ma nufa cturerAccess(). The

bq2060A disr ega r ds a ll ot h er com m a n ds. SMBu s

communication should be kept to a minimum during

VFC calibration to reduce the noise level and allow a

more accurate calibration.

br a t ion com m a n d. Th is dela ys t h e low-power

storage mode until after VFC calibration comple-

tion.

5. Issue the SEAL Command subsequent to the VFC

Calibration command. The bq2060A must receive

the SEAL Command before VFC calibration com-

pletes. The bq2060A resets the OCE bit in Pack

Status when calibration begins and sets the bit

when calibration successfully completes.

Once started, the VFC calibration procedure completes

automatically. When complete, the bq2060A saves the

calibration values in EEPROM. The calibration nor-

mally takes about 8 to 10 minutes. The calibration time

is inversely proportional to the bq2060A VFC (and PCB)

offset error. The bq2060A caps the calibration time at

one hour in the event of calibrating zero offset error. The

VFC calibration can be done as the last step in a battery

pack test procedure since the calibration can complete

automatically after removal from a test setup.

After VFC calibration completes automatically, the

bq2060A saves the VFC offset cancellation values in

EEPROM and enters the low-power storage mode in

about 20s. In addition, the bq2060A is sealed, allowing

access as defined in Table 3 only.

P u r p ose:

The bq2060A clears ManufacturerAccess() within 900ms

and starts calibration within 3.2s of acknowledging the

command.

The ManufacturerAccess() function provides the system

host access to bq2060A functions that are not defined by

the SBD.

0x0660 Stop VF C Ca libr a tion : Instructs the bq2060A

to abort a VFC calibration procedure. If aborted, the

bq2060A disables offset correction. The bq2060A stops

calibration within 20ms of acknowledging the command.

SMBu s P r otocol: Read or Write Word

In p u t/Ou tp u t: Word

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

0x0606 P r ogr a m E E P R OM: Instructs the unsealed

bq2060A to connect the SMBus to the EEPROM I²C bus.

The bq2060A applies power to the EEPROM within

900ms of acknowledging the command. After issuing the

program EEPROM command, the bq2060A monitoring

functions are disabled until the I²C bus is disconnected.

The bq2060A 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 10ms after the last write to the

EEPROM.

Descr ip tion :

Sets or gets the low-capacity threshold value. Whenever

the RemainingCapacity() falls below the low capacity

value, the bq2060A sends AlarmWarning() messages to

t h e SMBu s H ost wit h t h e RE MAIN IN G_CAPAC-

ITY_ALARM bit set. A low-capacity value of 0 disables

this alarm. The bq2060A initially sets the low-capacity

value to Remaining Capacity Alarm value programmed

in EE 0x04 - 0x05. The low-capacity value remains un-

ch a n ge d u n t il a lt e r e d b y t h e R e m a in in g-

CapacityAlarm() function. The low-capacity value may

be expressed in either current (mA) or power (10mWh)

depending on the setting of the BatteryMode()’s CAPAC-

ITY_MODE bit.

Exa m p le: The following sequence of actions is an exam-

ple 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 cal-

ibr a t ion a n d t o m a ke it r ea dy for sh ipm en t in t h e

SEALED state and in low-power storage mode:

P u r p ose:

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 be read to verify the value in use by the bq2060’s

low capacity alarm.

1. Complete testing and calibration with desired final

values stored in EEPROM. This process includes

set t in g t h e SE AL bit in P a ck Con figu r a tion .

Sending a reset command to the bq2060A during

test ensures that RAM values correspond to the fi-

nal EEPROM values

SMBu s P r otocol: Read or Write Word

2. If the initial value of RemainingCapacity() must be

non-zero, the desired value may be written to Com-

mand 0x26 with the pack unsealed. A reset sent af-

ter this step resets RM to zero.

In p u t /Ou t p u t : Unsigned integer—value below which

Low Capacity messages are sent.

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

mand.

4. Wit h in 900–1600m s a ft er sen din g t h e E n a ble

Low-Power command, issue the Enable VFC Cali-

17

bq2060A

n

Whether all broadcasts to the Smart Battery Charger

and Host are disabled

Battery Modes

CAPACITY_MODE CAPACITY_MODE

bit = 0

bit = 1

The defined request condition is the battery requesting

a conditioning cycle (RELEARN_FLAG).

Units

Range

mAh @ C/5

0–65,535mAh

10mWh @ P/5

0–65,535 10mWh

P u r p ose:

Granularity

Accuracy

Not applicable

See RemainingCapacity()

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 al-

lows a SMBus Host or Smart Battery Charger to over-

ride the Smart Battery’s desired charging parameters by

d is a b lin g t h e b q 2 0 6 0 ’s b r oa d ca s t s . T h e R E-

LEARN_FLAG bit allows the bq2060A to request a con-

ditioning cycle.

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

Descr iption :

Sets or gets the remaining time alarm value. Whenever the

AverageTimeToEmpty() falls below the remaining time

value, the bq2060A 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 bq2060A 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.

SMBu s P r otocol: Read or Write Word

In p u t/Ou tp u t:

Unsigned integer —bit mapped— see below.

Units: not applicable

P u r p ose:

The RemainingTimeAlarm() function can be used by sys-

tems that want to adjust when the remaining time

alarm warning is sent. The remaining time value can be

r ea d t o ver ify t h e va lu e in u s e by t h e bq2060’s

RemainingTimeAlarm().

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 bq2060A forces bits 0–6 to zero and prohibits writes

to bit 7.

SMBu s P r otocol: Read or Write Word

In p u t/Ou tp u t:

Unsigned integer—the point below which remain-

ing time messages are sent.

Table 8 summarizes the meanings of the individual bits

in the BatteryMode() word and specifies the default val-

ues, where applicable, are noted.

Units: minutes

Range: 0 to 65,535 minutes

Granularity: Not applicable

I N T E R N AL _C H AR G E _C O N T R O L L E R bit is n ot

used by the bq2060A.

Accuracy: see AverageTimeToEmpty()

P RIMARY_BATTERY_SUP P ORT bit is not used by

the bq2060A.

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

Descr ip tion :

RELEARN_F LAG bit set indicates that the bq2060A is

requesting a capacity relearn cycle for the battery. The

bq2060A sets the RELEARN_FLAG under any of three

conditions: full reset, detection of 20 cycle counts with-

out an FCC update, or a midrange voltage correction.

The bq2060A clears this flag after a learning cycle has

been completed.

This function selects the various battery operational

modes and reports the battery’s mode and requests.

Defined modes include

n

Whether the battery’s capacity information is

specified in mAh or 10mWh (CAPACITY_MODE bit)

CHARGE_CONTROLLER_ENABLED bit is not used

by the bq2060A. The bq2060A forces this bit to zero.

n

Whether the ChargingCurrent() and ChargingVoltage()

values are broadcast to the Smart Battery Charger

when the bq2060A detects the battery requires charging

(CHARGER_MODE bit)

P RIMARY_BATTERY bit is not used by the bq2060A.

The bq2060A forces this bit to zero.

18

bq2060A

Table 8. Battery Mode Bits and Values

Battery Mode() Bits

INTERNAL_CHARGE_CONTROLLER

PRIMARY_BATTERY_SUPPORT

Reserved

Bits Used

Format

Allowable Values

0

1

Read only bit flag

2–6

0—Battery OK

1—Relearn cycle requested

RELEARN_FLAG

7

Read only bit flag

CHARGE_CONTROLLER_ENABLED

PRIMARY_BATTERY

Reserved

8

9

R/W bit flag

10–12

0—Enable alarm broadcast (default)

1—Disable alarm broadcast

ALARM_MODE

CHARGER_MODE

CAPACITY_MODE

13

14

15

R/W bit flag

0—Enable charging broadcast

(default)

1—Disable charging broadcast

0—Report in mA or mAh (default)

1—Report in 10mW or 10mWh

Charger. When set, the bq2060A does NOT transmit

ChargingCurrent() and ChargingVoltage() values to the

Smart Battery Charger. When cleared, the bq2060A

transmits the ChargingCurrent() and ChargingVoltage()

va lu e s t o t h e S m a r t B a t t e r y C h a r ge r . T h e

CHARGER_MODE bit defaults to a cleared state within

130ms after the bq2060A detects the SMBus Off-State.

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 bq2060A does NOT master the SMBus, and

AlarmWarning() messages are NOT sent to the SMBus

Host and the Smart Battery Charger for a per iod of n o

m or e th an 65s an d n o less th an 45s. 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.

CAPACITY_MODE bit indicates if capacity informa-

tion is reported in mA/mAh or 10mW/10mWh. When

set , t h e bq2060A r epor t s ca pa cit y in for m a t ion in

10m W/10m Wh a s a ppr opr ia t e. Wh en clea r ed, t h e

bq2060A reports capacity information in mA/mAh as ap-

propriate. The CAPACITY_MODE bit defaults to a

cleared state within 130ms after the bq2060A detects

the SMBus Off-State.

n

The bq2060A polls the ALARM_MODE bit at least

every 150ms. Whenever the ALARM_MODE bit is set,

the bq2060A resets the bit and starts or restarts a 55s

(nominal) timer. After the timer expires, the bq2060A

automatically enables alarm broadcasts to ensure that

the accidental deactivation of broadcasts does not

persist. To prevent the bq2060A from becoming a

master on the SMBus, an SMBus host must therefore

continually set this bit at least once per 50s to keep

the bq2060A from broadcasting alarms.

Note 1: The following functions are changed to accept or

return values in mA/mAh or 10mW/10mWh depending

on the CAPACITY_MODE bit:

n

RemainingCapacityAlarm()

AtRate()

n

The ALARM_MODE bit defaults to a cleared state

within 130ms after the bq2060A detects the SMBus

Off-State.

RemainingCapacity()

FullChargeCapacity()

DesignCapacity()

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 of

ChargingCurrent() and ChargingVoltage() to the

Smart Battery Charger.

Note 2: The following functions are calculated on the

basis of capacity and may be calculated differently de-

pending on the CAPACITY_MODE bit:

CHARGER_MODE bit enables or disables the bq2060’s

t r a n s m is s ion of C h a r gin gC u r r e n t () a n d

Ch a r gin gVolt a ge() m essa ges t o t h e Sm a r t Ba t t er y

19

bq2060A

n

AtRateOK()

SMBu s P r otocol: Read or Write Word

AtRateTimeToEmpty()

AtRateTimeToFull()

RunTimeToEmpty()

AverageTimeToEmpty()

AverageTimeToFull()

Remaining Time Alarm()

BatteryStatus()

In p u t /Ou t p u t : Signed integer—charge or discharge;

the AtRate() value is positive for charge, negative for

discharge, and zero for neither (default).

Battery Mode

CAPACITY_MODE CAPACITY_MODE

bit = 0

bit = 1

Units

mA

10mW

Charge

Range

1–32,767mA

1–32,768 10mW

The bq2060A updates the non-AtRate related register

values within 3s of changing the state of the CAPAC-

ITY_MODE bit. The AtRate() values will be updated af-

ter the next AtRate value is written to the bq2060A (or

after the next 20s scheduled refresh calculation).

Discharge

Range

-1– -32,768mA

-1– -32,768 10mW

Granularity

Accuracy

1 Unit

NA

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

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

Descr ip tion :

The AtRate() function is the first half of a two-function

call-set used to set the AtRate value used in calculations

m a d e b y t h e At R a t e Tim e ToF u ll(), At R a t e Tim e -

ToEmpty(), and AtRateOK() functions. The AtRate

value may be expressed in either current (mA) or power

(10mW) depending on the setting of the BatteryMode()’s

CAPACITY_MODE bit.

Returns the predicted remaining time to fully charge

the battery at the AtRate( ) value (mA).

P u r p ose:

T h e At R a t e Tim e ToF u ll() fu n ct ion is p a r t of a

two-function call-set used to determine the predicted

remaining charge time at the AtRate value in mA. The

bq2060A updates AtRateTimeToFull() within 1.3s after

the SMBus Host sets the AtRate value. If read before

this delay, the command is No Acknowledged and the er-

ror code in BatteryStatus is set to not rea dy. The

bq2060A automatically updates AtRateTimeToFull()

based on the AtRate() value every 20s.

P u r p ose:

Sin ce t h e At Ra t e() fu n ct ion is t h e fir st h a lf of a

two-function call-set, it is followed by the second func-

tion 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 1.3s is required after writing

AtRate() before the bq2060A can acknowledge the re-

quested AtRate function.

SMBu s P r otocol: Read Word

n

When the AtRate() value is positive, the AtRate-

TimeToFull() function returns the predicted time to

full-charge at the AtRate value of charge.

Ou tp u t:

Unsigned integer—predicted time in minutes to

fully charge the battery.

n

When the AtRate() value is negative, the

AtRateTimeToEmpty() function returns the predicted

operating time at the AtRate value of discharge.

Units: minutes

n

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.

Range: 0 to 65,534 min

Granularity: 2 min or better

Accuracy: ±MaxError() _*

FullChargeCapacity()/| AtRate()|

Th e defa u lt va lu e for At Ra t e() is zer o. Wr it in g

AtRate() values over the HDQ16 serial port does NOT

Invalid Data Indication: 65,535 indicates the bat-

tery is not being charged.

t r igger

a r e-ca lcu la t ion of At Ra t eTim eToF u ll(),

AtRateTimeToEmpty(), and AtRateOK() functions.

It is recommended that AtRate() requests should be lim-

ited to one request every 4s.

20

bq2060A

Range: TRUE, FALSE

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

Granularity: not applicable

Accuracy: not applicable

Descr ip tion :

Returns the predicted remaining operating time if the

battery is discharged at the AtRate() value.

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

P u r p ose:

Th e At Ra t eTim eToE m p t y() fu n ct ion is p a r t of a

two-function call-set used to determine the remaining

operating time at the AtRate()value. The bq2060A up-

da t es At Ra t eTim eToE m pt y() wit h in 1.3s a ft er t h e

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 bq2060A

automatically updates AtRateTimeToEmpty() based on

the AtRate() value every 20s.

Descr ip tion :

Returns the temperature (K) measured by the bq2060A.

P u r p ose:

The Temperature() function provides accurate cell tem-

peratures for use by battery chargers and thermal man-

agement systems. A battery charger can use the tem-

perature as a safety check. Thermal management sys-

tems may use the temperature because the battery is

one of the largest thermal sources in a system.

SMBu s P r otocol: Read Word

Ou tp u t:

SMBu s P r otocol: Read Word

Ou tp u t:

Unsigned integer — estimated operating time left.

Units: minutes

U n s ign e d in t e ge r —ce ll t e m p e r a t u r e in

tenth-degree Kelvin increments.

Range: 0 to 65,534 min

Units: 0.1°K

Granularity: 2 min or better

Range: 0 to +6553.5°K {real range}

Granularity: 0.1°K

Accuracy: -0, +MaxError() _*

FullChargeCapacity/| AtRate()|

Accuracy: ±1.5°K (from ideal 103AT thermistor

performance, after calibration)

Invalid Data Indication: 65,535 indicates the bat-

tery is not being discharged.

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

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

Descr ip tion :

Returns the cell-pack voltage (mV).

Descr ip tion :

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 re-

turn-true.

P u r p ose:

The Voltage() function provides power management sys-

tems 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.

P u r p ose:

Th e At Ra t eOK() fu n ct ion is pa r t of a t wo-fu n ct ion

call-set used by power management systems to deter-

mine if the battery can safely supply enough energy for

an additional load. The bq2060A updates AtRateOK()

within 1.3s after the SMBus Host sets the AtRate( )

value. If read before this delay, the command is No Ac-

knowledged, and the error code in BatteryStatus is set

t o n ot r ea d y. Th e bq2060A a u t om a t ica lly u pda t es

AtRateOK() based on the At Rate() value every 20s.

SMBu s P r otocol: Read Word

Ou tp u t:

Unsigned integer—battery terminal

voltage in mV.

Units: mV

SMBu s P r otocol: Read Word

Range: 0 to 20,000 mV

Granularity: 1mV

Ou tp u t:

Boolean—indicates if the battery can

supply the additional energy requested.

Accuracy: ±0.65% (after calibration)

Units: Boolean

21

bq2060A

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

the Relative StateOfCharge() is more likely between 50

and 60%. The bq2060A sets MaxError() to 100% on a

full reset. The bq2060A sets MaxError() to 2% on com-

pletion of a learning cycle, unless the bq2060A limits

the learning cycle to the +512/-256mAh maximum ad-

justment values. If the learning cycle is limited, the

bq2060A sets MaxError() to 8% unless MaxError() was

already below 8%. In this case MaxError() does not

change. The bq2060A increments MaxError() by 1% af-

ter four increments of CycleCount() without a learning

cycle.

Descr ip tion :

Ret u r n s t h e cu r r en t bein g su pplied (or a ccept ed)

through the battery’s terminals (mA).

P u r p ose:

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 charac-

terize individual devices and tune their operation to ac-

tual system power behavior.

If voltage-based corrections are applied to the coulomb

counter, MaxError() is set to 25%.

SMBu s P r otocol: Read Word

Ou tp u t:

P u r p ose:

The MaxError() function has real value in two ways:

first, to give the user a confidence level about 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.

Signed integer—charge/discharge rate in mA incre-

ments—positive for charge, negative for discharge.

Units: mA

Range: (± 250mV/R_S) mA

SMBu s P r otocol: Read Word

Granularity: 0.038mV/R_S(integer value)

Accuracy: ±1mV/R_S(after calibration)

Ou tp u t:

Unsigned integer—percent uncertainty for selected

information.

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

Descr ip tion :

Units: %

Returns a value that approximates a one-minute rolling

average of the current being supplied (or accepted)

t h r ou gh t h e b a t t e r y’s t e r m in a ls (m A).

Range: 2 to 100%

T h e

AverageCurrent() function will return meaningful val-

ues during the battery’s first minute of operation.

Granularity: 1%

Accuracy: not applicable

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

P u r p ose:

The AverageCurrent() function provides the average cur-

rent flowing into or out of the battery for the power

management system.

Descr ip tion :

Returns the predicted remaining battery capacity ex-

pressed as a percentage of FullChargeCapacity() (%).

SMBu s P r otocol: Read Word

P u r p ose:

Ou tp u t:

The RelativeStateOfCharge() function is used to esti-

mate the amount of charge remaining in the battery rel-

ative to the last learned capacity.

Signed integer—charge/discharge rate in mA incre-

ments—positive for charge, negative for discharge.

SMBu s P r otocol: Read Word

Ou tp u t:

Units: mA

Range: (± 250mV/R_S) mA

Unsigned integer—percent of remaining capacity.

Units: %

Granularity: 0.038mV/R_S(integer value)

Accuracy: ±1mV/R_S(after calibration)

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

Range: 0 to 100%

Granularity: 1%

Descr ip tion :

Returns the expected margin of error (%) in the state of

charge calculation. For example, when MaxError() re-

turns 10% and RelativeStateOfCharge() returns 50%,

Accuracy: -0, +MaxError()

22

bq2060A

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

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

Descr ip tion :

Returns the predicted remaining battery capacity ex-

pressed as a percentage of DesignCapacity() (%). Note

that AbsoluteStateOfCharge() can return values greater

than 100%.

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

(10mWh at a P/5 discharge rate) depending on the set-

ting of the BatteryMode()’s CAPACITY_MODE bit.

P u r p ose:

The AbsoluteStateOfCharge() function is used to esti-

mate the amount of charge remaining in the battery rel-

ative to the nominal or DesignCapacity().

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.

SMBu s P r otocol: Read Word

Ou tp u t:

SMBu s P r otocol: Read Word

Unsigned integer—percent of remaining capacity.

Units: %

Ou tp u t:

Unsigned integer—estimated full-charge capacity

in mAh or 10mWh.

Range: 0 to 100+%

Granularity: 1%

Battery Mode

Accuracy: -0, +MaxError()

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

CAPACITY_MODE CAPACITY_MODE

bit = 0

bit = 1

Units

Range

mAh

10mWh

Descr ip tion :

0–65,535mAh

mAh

0–65,535 10mWh

10mWh

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

(10mWh at a P/5 discharge rate) depending on the set-

ting of the BatteryMode()’s CAPACITY_MODE bit.

Granularity

Accuracy

-0, +MaxError() FullChargeCapacity()

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

P u r pose:

Descr ip tion :

The RemainingCapacity() function returns the battery’s

remaining capacity. This information is a numeric indica-

tion 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.

Returns the predicted remaining battery life at the pres-

e n t

r a t e of d is ch a r ge (m in u t e s ).

T h e

RunTimeToEmpty() value is calculated based on either

cu r r en t or power depen din g on t h e set t in g of t h e

BatteryMode()’s CAPACITY_MODE bit.

SMBu s P r otocol: Read Word

P u r p ose:

Ou tp u t:

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. Th is in for m a t ion is N OT t h e sa m e a s t h e

AverageTimeToEmpty(), which is not suitable to deter-

mine the effects that result from a change in power policy.

Unsigned integer—remaining charge in mAh or

10mWh.

Battery Mode

CAPACITY_MODE CAPACITY_MODE

SMBu s P r otocol: Read Word

Ou tp u t:

bit = 0

bit = 1

Units

Range

mAh

10mWh

0–65,535mAh

mAh

0–65,535 10mWh

10mWh

Unsigned integer—minutes of operation left.

Units: minutes

Granularity

Accuracy

-0, +MaxError() FullChargeCapacity()

Range: 0 to 65,534 min

Granularity: 2 min or better

23

bq2060A

Accuracy: -0, +MaxError() FullChargeCapacity()

/ Current()

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

Descr ip tion : Returns the desired charging rate in mA.

Invalid Data Indication: 65,535 indicates battery is

not being discharged.

P u r p ose : The ChargingCurrent() function sets the

m a xim u m ch a r ge cu r r e n t of t h e b a t t e r y. T h e

ChargingCurrent() value should be used in combination

with the ChargingVoltage() value to set the charger ’s op-

erating point. Together, these functions permit the

bq2060A to dynamically control the charging profile

(current/voltage) of the battery. The bq2060A can effec-

tively turn off a charger by returning a value of 0 for

this function. The charger may be operated as a con-

stant-voltage source above its maximum regulated cur-

rent range by returning a ChargingCurrent() value of

65,535.

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

Descr ip tion : Returns a one-minute rolling average of

the predicted remaining battery life (minutes). The

AverageTimeToEmpty() value is calculated based on ei-

ther current or power depending on the setting of the

BatteryMode()’s CAPACITY_MODE bit.

P u r p ose:

The AverageTimeToEmpty() displays state-of-charge in-

formation in a more useful way. It averages the instan-

taneous estimations so the remaining time does not ap-

pear to jump around.

SMBu s P r otocol: Read Word

Ou tp u t:

SMBu s P r otocol: Read Word

Ou tp u t:

Unsigned integer—maximum charger output cur-

rent in mA.

Unsigned integer — minutes of operation left.

Units: minutes

Units: mA

Range: 0 to 65,535mA

Granularity: 1mA

Accuracy: not applicable

Range: 0 to 65,534 min

Granularity: 2 min or better

Accuracy: -0, +MaxError() FullChargeCapacity()

/ AverageCurrent()

Invalid Data Indication: 65,535 indicates that a

charger should operate as a voltage source outside

its maximum regulated current range.

Invalid Data Indication: 65,535 indicates battery is

not being discharged.

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

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

Descr ip tion : Returns the desired charging voltage in

mV.

Descr ip tion : Returns a one-minute rolling average of

the predicted remaining time until the battery reaches

full charge (minutes).

P u r p ose: The ChargingVoltage() function sets the max-

im u m ch a r ge volt a ge of t h e b a t t e r y. T h e

ChargingVoltage() value should be used in combination

with the ChargingCurrent() value to set the charger ’s

operating point. Together, these functions permit the

bq2060A to dynamically control the charging profile

(current/voltage) of the battery. The charger may be op-

erated as a constant-current source above its maximum

P u r p ose: 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.

SMBu s P r otocol: Read Word

Ou tp u t:

r e gu la t e d volt a ge r a n ge b y r e t u r n in g

ChargingVoltage() value of 65,535.

a

Unsigned integer —remaining time in minutes.

Units: minutes

SMBu s P r otocol: Write Word

Ou tp u t:

Range: 0 to 65,534 minutes

Granularity: 2 minutes or better

Unsigned integer—charger output voltage in mV.

Units: mV

Accuracy: MaxError()

AverageCurrent()

FullChargeCapacity() /

Range: 0 to 65,535mV

Granularity: 1mV

Invalid Data Indication: 65,535 indicates the bat-

tery is not being charged.

24

bq2060A

Accuracy: not applicable

Alarm Bits

OVE R _CH AR GE D_ALAR M bit is set whenever the

bq2060A detects that the battery is being charged be-

yond the Maximum Overcharge limit. This bit is cleared

when the bq2060A detects that the battery is no longer

being charged (i.e., the bq2060A detects discharge activ-

ity or no activity for the digital filter timeout periods.

The digital filter timeout period (seconds) equates to 10

time the value shared in Digital Filter EE0x52.)

Invalid Data Indication: 65,535 indicates that the

charger should operate as a current source outside

its maximum regulated voltage range.

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

Descr ip tion : Returns the bq2060’s status word (flags).

Some of the BatteryStatus() flags (REMAINING_CA-

PACITY_ALARM and REMAINING_TIME_ALARM)

are calculated based on either current or power depend-

in g on t h e set t in g of t h e Ba t t er yMode()’s CAPAC-

ITY_MODE bit. This is important because use of the

wrong calculation mode may result in an inaccurate

alarm.

TERMINATE_CHARGE_ALARM bit is set when the

bq2060A detects that one or more of the battery’s charg-

ing parameters are out of range (e.g., its voltage, cur-

rent, or temperature is too high) or when the bq2060A

det ect s a pr im a r y ch a r ge t er m in a t ion . Th is bit is

cleared when the parameter falls back into the allow-

able range, the termination condition ceases, or when

the bq2060A detects that the battery is no longer being

charged.

P u r p ose: The BatteryStatus() function is used by the

power-management system to get alarm and status bits,

as well as error codes from the bq2060A. This is basi-

cally the same information broadcast to both the SMBus

H os t a n d t h e S m a r t B a t t e r y C h a r ge r b y t h e

Ala r m Wa r n in g() fu n ct ion e xce p t t h a t t h e

AlarmWarning() function sets the Error Code bits all

high before sending the data.

OVER_TEMP _ALARM bit is set when the bq2060A de-

tects 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 ac-

ceptable range.

TERMINATE_DISCHARGE_ALARM bit is set when

the bq2060A detects Voltage() ≤ EDV0, the CVUV bit in

Pack Status is set (Li-Ion cell voltage has dropped below

the limit programmed in Cell Under / Over Voltage), or

RemainingCapacity() = 0. The bit is cleared when Volt-

SMBu s P r otocol: Read Word

Ou tp u t:

Unsigned integer—Status Register with alarm con-

ditions bit mapped as follows:

a ge ()

> E D V0 or C VU V b it is cle a r e d , a n d

RemainingCapacity() > 0.

REMAINING_CAPACITY_ALARM bit is set when the

bq2060A detects that RemainingCapacity() is less than

that set by the RemainingCapacityAlarm() function.

This bit is cleared when either the value set by the

Rem a in in gCa pa cit yAla r m () fu n ct ion is lower t h a n

RemainingCapacity() or when the RemainingCapacity()

is increased by charging.

Alarm Bits

0x8000

0x4000

0x2000

0x1000

0x0800

0x0400

0x0200

0x0100

OVER_CHARGED_ALARM

TERMINATE_CHARGE_ALARM

reserved

OVER_TEMP_ALARM

TERMINATE_DISCHARGE_ALARM

reserved

REMAINING_CAPACITY_ALARM

REMAINING_TIME_ALARM

Status Bits

R E MAI N I N G _T I ME _AL AR M bit is set wh en t h e

bq2060A 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() func-

tion is lower than the AverageTimeToEmpty() or when the

AverageTimeToEmpty() is increased by charging.

0x0080

0x0040

0x0020

0x0010

INITIALIZED

DISCHARGING

FULLY_CHARGED

FULLY_DISCHARGED

Error Codes

Status Bits

0x0007

0x0006

0x0005

0x0004

0x0003

0x0002

0x0001

0x0000

Unknown Error

INITIALIZED bit is set when the bq2060A is has de-

tected a valid load of EEPROM. It is cleared when the

bq2060A detects an improper EEPROM load.

BadSize

Overflow/Underflow

AccessDenied

UnsupportedCommand

ReservedCommand

Busy

DISCH AR GING bit is set when the bq2060A deter-

mines that the battery is not being charged. This bit is

cleared when the bq2060A detects that the battery is be-

ing charged.

OK

25

bq2060A

Granularity: 1 cycle

F ULLY_CHARGED bit is set when the bq2060A de-

tects a primary charge termination or an overcharged

condition. It is cleared when RelativeStateOfCharge() ≤

the programmed Fully Charged Clear % in EE 0x4c.

Accuracy: absolute count

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

F ULLY_DISCH AR GE D bit is set when Voltage() ≤

EDV2 threshold, or RemainingCapacity() < Full Charge

Descr ip tion : Returns the theoretical or nominal capac-

ity of a new pack. The DesignCapacity() value is ex-

pressed in either current (mAh at a C/5 discharge rate)

or power, (10mWh at a P/5 discharge rate) depending on

the setting of the BatteryMode()’s CAPACITY_MODE

bit.

Capacity

Relative StateOfCharge() is ≥ 20%.

BatteryLow%. This bit is cleared when the

*

Error Codes

Description

The bq2060A processed the function

code without detecting any errors.

OK

P u r p ose: The DesignCapacity() function is used by the

SMBus Host’s power management in conjunction with

FullChargeCapacity() to determine battery wear. The

power management system may present this informa-

tion to the user and also adjust its power policy as a re-

sult.

The bq2060A is unable to process the

function code at this time.

Busy

The bq2060A 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.

Reserved

SMBu s P r otocol: Read Word

Ou tp u t:

The bq2060A does not support this

function code which is defined in this

version of the specification.

Unsupported

Unsigned integer—ba ttery ca pa city in mAh or

10mWh.

The bq2060A detected an attempt to

write to a read-only function code.

AccessDenied

Battery Mode

CAPACITY_MODE CAPACITY_MODE

The bq2060A detected a data overflow

or underflow.

Over/Underflow

bit = 0

bit = 1

The bq2060A detected an attempt to

write to a function code with an

incorrect data block.

Units

Range

Granularity

Accuracy

mAh

10mWh

0–65,535 10mWh

BadSize

0–65,535mAh

Not applicable

The bq2060A detected an

unidentifiable error.

UnknownError

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

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

Descr ip tion : Returns the theoretical voltage of a new

pack (mV). The bq2060A sets DesignVoltage() to the

value programmed in Design Voltage EE0x12–0x13.

Descr ip tion : Returns the number of cycles the battery

has experienced. The mAh value of each count is deter-

mined by programming the Cycle Count Threshold value

in EE 0x3c–0x3d. The bq2060A saves the cycle count

value to Cycle Count EE 0x0e–0x0f after an update to

CycleCount().

P u r p ose: The DesignVoltage() function can be used to

give additional information about a particular Smart

Battery’s expected terminal voltage.

SMBu s P r otocol: Read Word

P u r p ose: 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.

Ou tp u t:

Unsigned integer—the battery’s designed terminal

voltage in mV

SMBu s P r otocol: Read Word

Units: mV

Ou tp u t:

Range: 0 to 65,535 mV

Granularity: not applicable

Accuracy: not applicable

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.

26

bq2060A

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

Field Bits Used

Format

Allowable Values

5-bit binary 0–31 (corresponds to

value date)

4-bit binary 1–12 (corresponds to

value month number)

7-bit binary 0–127 (corresponds to

value year biased by 1980)

Day

Month

Year

0...4

5...8

Descr ip tion : Returns the version number of the Smart

Battery specification the battery pack supports, as well

as voltage and current scaling information in a packed

unsigned integer. Power scaling is the product of the

volt a ge s ca lin g t im es t h e cu r r en t s ca lin g. Th e

SpecificationInfo is packed in the following fashion:

9...15

(SpecID_H

0x10) 0x100.

0x10 + SpecID_L) + (VScale + IPScale

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

Descr ip tion : This function is used to return a serial

n u m ber. Th is n u m ber, wh en com bin ed wit h t h e

Ma n u fa ct u r er N a m e(), t h e DeviceN a m e(), a n d t h e

ManufactureDate(), uniquely identifies the battery (un-

signed int). The bq2060A sets SerialNumber() to the

value programmed in Serial Number EE 0x18–0x19.

The bq2060A VScale (voltage scaling) and IPScale (cur-

rent scaling) should always be set to zero. The bq2060A

sets SpecificationInfo() to the value programmed in

Specification Information EE 0x14–0x15.

P u r p ose: The SpecificationInfo() function is used by

the SMBus Host’s power management system to deter-

mine what information the Smart Battery can provide.

P u r p ose: 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.

SMBu s P r otocol: Read Word

Ou tp u t:

SMBu s P r otocol: Read Word

Ou tp u t:

Unsigned integer—packed specification number

and scaling information.

Unsigned integer

Bits

Field

Used

Format

4-bit binary

value

4-bit binary

value

4-bit binary 0 (multiplies voltage

value by 10^ VScale)

4-bit binary 0 (multiplies current

value by 10 ^ IPScale)

Allowable Values

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

SpecID_L

0...3

0–15

Descr ip tion : This function returns a character array

containing the battery’s manufacturer ’s name. For ex-

ample, MyBattCo would identify the Smart Battery’s

m a n u fa ct u r e r a s M yB a t t C o. T h e b q 2 0 6 0 A s e t s

ManufacturerName() to the value programmed in Man-

ufacturer Name EE 0x20–0x2a.

SpecID_H

VScale

4...7

8...11

12...15

0–15

IPScale

P u r p ose: 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 manufac-

turer. The name is also useful as part of the informa-

tion required to uniquely identify a battery.

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

Descr ip tion : 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 bq2060A sets ManufactureDate()

t o t h e va lu e pr ogr a m m ed in Ma n u fa ctu r e Da te E E

0x16–0x17.

SMBu s P r otocol: Read Block

Ou tp u t:

String—character string with maximum length of

11 characters (11+length byte).

P u r p ose: The ManufactureDate() provides the system

with information that can be used to uniquely identify a

particular battery pack when used in conjunction with

SerialNumber().

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

Descr ip tion : This function returns a character string

t h a t con t a in s t h e ba t t er y’s n a m e. F or exa m ple, a

DeviceNa me() of BQ2060A would indica te tha t the

ba t t er y is a m od el BQ2060A. Th e bq2060A s et s

DeviceName() to the value programmed in Device Name

EE 0x30–0x37.

SMBu s P r otocol: Read Word

Ou tp u t:

Unsigned integer—packed date of manufacture.

27

bq2060A

P u r p ose: The DeviceName() function returns the bat-

tery’s name for identification purposes.

Ou tp u t:

Block data—data that reflects EEPROM program-

SMBu s P r otocol: Read Block

ming as assigned by the manufacturer with maxi-

mum length of 7 characters (7+length byte).

Ou tp u t:

String—character string with maximum length of 7

characters (7+length byte).

Pack Status and Pack Configuration (0x2f);

[0x2f]

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

This function returns the Pack Status and Pack Config-

uration registers. The Pack Status register contains a

number of status bits relating to bq2060A 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

bq2060A is configured as defined by the value pro-

grammed in Pack Configuration in EE 0x3f.

Descr ip tion : This function returns a character string

that contains the battery’s chemistry. For example, if

t h e DeviceCh em ist r y() fu n ct ion r et u r n s NiMH , t h e

battery pack would contain nickel metal hydride cells.

Th e bq2060A set s DeviceCh em ist r y() t o t h e va lu e

programmed in Device Chemistry EE 0x40–0x44.

P u r p ose: The DeviceChemistry() function gives cell

chemistry information for use by charging systems. The

bq2060A does not use DeviceChemisty() values for inter-

nal charge control or fuel gauging.

The Pack Status Register consists of the following bits:

b7

b6

b5

b4

b3

b2

b1

b0

SMBu s P r otocol: Read Block

OCE

EDV2 EINT VDQ COK DOK CVOV CVUV

Ou tp u t:

OCE

String—character string with maximum length of 4

characters (4+length byte).

The OCE bit indicates that offset cancellation is en-

abled. The bq2060A sets this bit after VFC offset cali-

bration is complete.

Note: The following is a partial list of chemistries and

their expected abbreviations. These abbreviations are

NOT case sensitive.

0

1

Offset calibration is not enabled

Offset calibration is enabled

Lead acid

PbAc

LION

NiCd

NiMH

NiZn

RAM

ZnAr

Lithium ion

EDV2

Nickel cadmium

Nickel metal hydride

Nickel zinc

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

EDV2 threshold.

0

1

Voltage() > EDV2 threshold (discharging)

Rechargeable alkaline-manganese

Zinc air

Voltage() ≤ EDV2 threshold

EINT

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

The EINT bit indicates that the VFC has detected a

charge or discharge pulse.

Descr ip tion : This function allows access to the manu-

fa ct u r er da t a con t a in ed in t h e ba t t er y (da t a ). Th e

bq2060A stores seven critical operating parameters in

this data area.

0

No charge/discharge activity detected

Charge/discharge activity detected.

1

P u r p ose: 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 bq2060A under various programming sets.

The ManufacturerData() function returns the following

in for m a t ion in or der : Con tr ol Mod e, Digita l F ilter,

Self-Discharge Rate, Battery Low %, Near Full, and the

pending EDV threshold voltage (low byte and high byte.)

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

SMBu s P r otocol: Read Block

28

bq2060A

EEPROM Programming

COK

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

bq2060A.

The following sections describes the function of each

EEPROM location and how the data is to be stored.

0

1

CFC pin is low

CFC pin is high

Fundamental Parameters

DOK

Sense Resistor Value

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

bq2060A.

Two factors are used to scale the current related mea-

surements. 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 pro-

vides a method to calibrate the current readings for sys-

tem errors and the sense resistor value (R_S) . The nomi-

nal value is set by

0

1

DFC pin is low

DFC pin is high

CVOV

The CVOV bit indicates that a secondary Li-Ion protec-

tion 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.

625

(4)

(Rs)

ADC Sense Resistor Gain =

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 resis-

tor. The following formula computes a nominal or start-

ing value for VFC Sense Resistor Gain from the sense

resistor value.

0

1

No secondary protection limits exceeded

A secondary protection limit exceeded

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.

409.6

(Rs)

(5)

VFC Sense Resistor Gain =

Sense resistor values are limited to the range of 0.00916

0

1

All series cells are above the low-voltage limit

A series cell is below the low voltage limit

to 0.100Ω.

Digital Filter

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

The digital filter threshold, VDF (µV), is set by the

value stored in Digital Filter EE 0x52.

These functions return the calculated voltages in mV at

the VCELL₄through VCELL₁inputs.

2250

VDF

(6)

Digital Filter =

EEPROM

Cell Characteristics

General

Battery Pack Capacity and Voltage

The bq2060A accesses the external EEPROM during a

full reset and when storing historical data. During an

EEPROM access, the V_OUTpin becomes active and the

bq2060A uses the ESCL and ESDA pins to communicate

with the EEPROM. The EEPROM stores basic configu-

r a t ion in for m a t ion for u se by t h e bq2060A. Th e

EEPROM must be programmed correctly for proper

bq2060A operation.

Pack capacity in mAh units is stored in Pack Capacity

EE 0x3a–0x3b. In mAh mode, the bq2060A copies Pack

Ca pa city t o Design Ca pa cit y(). In m Wh m ode, t h e

bq2060A multiplies Pack Capacity by Design Voltage EE

0x12–0x13 t o ca lcu la t e Design Ca pa cit y() sca led t o

10mWh. 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 bq2060A

u pda t es La st Mea su r ed Disch a r ge in m Ah a ft er a

ca p a cit y le a r n in g cycle . T h e b q 2 0 6 0 A u s e s t h e

L a s t M ea s u r ed D i s ch a r ge va lu e t o ca lcu la t e

FullChargeCapacity() in mAh or 10mWh mode.

Memory Map

Table 9 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 0.05Ω sense resistor.

29

bq2060A

Table 9. EEPROM Memory Map

EEPROM

Address

NiMH

Data

Li-Ion

Example

Data

Name

Chemistry

Example

MSB LSB

0x00 0x01

0x02 0x03

Check Byte 1

Li-Ion, Nickel

15487

3c

00

01

7f

0a

5e

15487

10 minutes

400mAh

3c

00

01

7f

0a

90

Remaining Time Alarm

Li-Ion, Nickel 10 minutes

0x04 0x05 Remaining Capacity Alarm Li-Ion, Nickel

350mAh

EDV A0 Impedance Age

0x06

0x07

Li-Ion, Nickel

-

0

-

00

0

3

-

00

03

Factor

EDV TC Cold Impedance

Factor

0

0x08

Misc Options

Safety Overtemperature

Charging Voltage

Reserved

-

0

-

00

50

80

00

e0

31

0

-

00

38

80

00

30

31

59

01

b8

0x09

-

0

12600mV

128

-

0x0a 0x0b

0x0c 0x0d

0x0e 0x0f

0x10 0x11

0x12 0x13

0x14 0x15

0x16 0x17

0x18 0x19

0x1a 0x1b

Li-Ion, Nickel 18000mV

46

00

2e

00

31

00

2a

00

26

00

0b

-

128

0

Cycle Count

Li-Ion, Nickel

-

0

Reserved

0

Design Voltage

Li-Ion, Nickel 12000mV

v1.1/PEC

10800mV

v1.1/PEC

Specification Information Li-Ion, Nickel

Manufacture Date

Serial Number

Li-Ion, Nickel 2/25/99=9817 26

59 2/25/99=9817

Li-Ion, Nickel

1

00

0f

01

a0

1

Fast-Charging Current

4000mA

3000mA

Maintenance Charging

Current

0x1c 0x1d

Li-Ion, Nickel

200mA

00

c8

0mA

00

0x1e 0x1f

0x20

Pre-Charge Current

Li-Ion, Nickel

800mA

03

-

20

09

42

45

4e

43

48

4d

41

52

51

00

38

07

42

51

32

30

100mA

00

-

64

09

42

45

4e

43

48

4d

41

52

51

00

07

42

51

32

30

Manufacturer Name Length Li-Ion, Nickel

9

0x21

Character 1

Character 2

Li-Ion, Nickel

-

B

-

B

-

0x22

E

-

E

-

0x23

Character 3

N

-

N

-

0x24

Character 4

C

-

C

-

0x25

Character 5

H

-

H

-

0x26

Character 6

M

-

M

-

0x27

Character 7

A

-

A

-

0x28

Character 8

R

-

R

-

0x29

Character 9

Q

-

Q

-

0x2a

Character 10

Light Discharge Current

Reserved

0

-

0

-

0x2b

0

-

0

-

0x2c 0x2d

0x2e 0x2f

0x30

0

00

ff

-

0

00

ff

-

Maximum Overcharge

Device Name Length

Character 1

Li-Ion, Nickel

200mAh

256mAh

7

B

Q

2

7

B

Q

2

0x31

-

0x32

Character 2

-

0x33

Character 3

-

0x34

Character 4

0

-

0

-

(Continued on next page)

Note:

Reserved locations must be set as shown. Locations marked with an * are calibration values that can be

adjusted for maximum accuracy. For these locations the table shows the appropriate default or initial

30

bq2060A

Table 9. EEPROM Memory Map (Continued)

EEPROM

Address

NiMH

Example

Data

Li-Ion

Example

Data

Name

Chemistry

MSB LSB

0x35

0x36

0x37

Character 5

Character 6

Character 7

Li-Ion, Nickel

6

0

-

36

30

41

a0

0c

00

e8

04

4e

49

4d

48

c7

70

00

20

00

-

6

-

36

30

41

d2

58

00

f6

0

A

-

A

-

0x38 0x39 Last Measured Discharge Li-Ion, Nickel 4000mAh

0f

fe

-

4050mAh

0f

f3

-

0x3a 0x3b

0x3c 0x3d

0x3e

Pack Capacity

Cycle Count Threshold

Reserved

Li-Ion, Nickel 4000mAh

Li-Ion, Nickel 500mAh

4050mAh

3240mAh

-

0

232

4

0

0x3f

Pack Configuration

Device Chemistry Length

Character 1

Li-Ion, Nickel

-

246

-

0x40

-

4

-

04

4c

49

4f

4e

cf

0x41

N

-

L

-

0x42

Character 2

I

-

I

-

0x43

Character 3

M

H

-

O

-

0x44

Character 4

-

N

50C, 4.6

6000mA

800mV

512mA

-

0x45

MaxT DeltaT

Li-Ion, Nickel 50C, 3.0

Li-Ion, Nickel 6000mA

-

0x46 0x47

0x48

Overload Current

Overvoltage Margin

Overcurrent Margin

Reserved

17

-

17

-

70

32

20

-

Li-Ion, Nickel

Nickel

0

512mA

0

0x49

-

0x4a

Cell Under/ Over Voltage

Li-Ion

-

118

-

76

9c

a1

ff

0x4b

0x4c

0x4d

Fast Charge Termination % Li-Ion, Nickel

96%

90%

97%

-

a0

a6

el

100%

95%

100%

200mA

-

Fully Charged Clear %

Charge Efficiency

Li-Ion, Nickel

Li-Ion

-

Current Taper Threshold

DeltaT Time

-

12

-

0x4e

0x4f

Nickel

180s

240s

-

07

04

-

Holdoff Time

Nickel

-

Current Taper Qual Voltage

Li-Ion

-

128mV

7

-

40

07

04

2d

05

12

64

00

0x50

Manufacturers Data Length Li-Ion, Nickel

7

-

07

04

2d

cb

12

64

00

-

0x51

Control Mode

Digital Filter

Self-Discharge Rate

Battery Low %

Near Full

Li-Ion, Nickel

4

0x52

50µV

1%

7%

-

50µV

0.21%

7%

-

0x53

0x54

0x55

Li-Ion, Nickel 200mAh

200mAh

0

0x56 0x57

0x58 0x59

0x5a 0x5b

Reserved

-

0

Reserved

0

Reserved

0

(Continued on next page)

Note:

Reserved locations must be set as shown. Locations marked with an * are calibration values that can be

adjusted for maximum accuracy. For these locations the table shows the appropriate default or initial

setting.

31

bq2060A

Table 9. EEPROM Memory Map (Continued)

EEPROM

Address

NiMH

Example

Data

Li-Ion

Example

Data

Description

Chemistry

MSB LSB

0x5c 0x5d

0x5e 0x5f

0x60

Reserved

VFC Offset*

-

0

-

00

-

00

-

0

00

-

00

Li-Ion, Nickel

Li-Ion

VFC Offset*

0x61

Temperature Offset*

ADC Offset*

-

0x62

-

Cell 2 Calibration Factor*

-

0x63

0x64

Efficiency Temperature

Compensation

Nickel

Li-Ion

Nickel

0.25%

-

20

-

0

-

00

-

Cell 3 Calibration Factor*

Efficiency Drop Off

Percentage

96%

a0

Cell 4 Calibration Factor*

Efficiency Reduction Rate

ADC Voltage Gain*

Li-Ion

Nickel

-

0

-

00

-

0x65

1%

-

50

20

d4

00

14

2c

44

1c

10

00

-

0x66 0x67

Li-Ion, Nickel

16 : 1

0.05Ω

4e

30

20

d3

cf

16 : 1

4e

30

20

d6

d4

28

2d

11

20

d4

00

ca

02

40

19

1e

7b

0x68 0x69 ADC Sense Resistor Gain* Li-Ion, Nickel

0x6a 0x6b VFC Sense Resistor Gain* Li-Ion, Nickel

0.05Ω

0x6c 0x6d

0x6e 0x6f

0x70 0x71

0x72 0x73

0x74 0x75

0x76 0x77

VOC 25%

VOC 50%

Li-Ion, Nickel 11500mV

Li-Ion, Nickel 12500mV

Li-Ion, Nickel 13500mV

10550mV

10750mV

11200mV

10265mV

11550

VOC 75%

cb

25

27

00

EDVF/ EDV0

EMF/ EDV1

EDV T0 Factor

Li-Ion, Nickel

9500mV

10000mV

0

4475

C1 = 0

C0 = 235

0x78 0x79 EDV C1/ C0 Factor/ EDV2 Li-Ion, Nickel 10500mV

29

04

00

eb

0x7a 0x7b

0x7c 0x7d

0x7e 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

Note:

Reserved locations must be set as shown. Locations marked with an * are calibration values that can be adjusted

for maximum accuracy. For these locations the table shows the appropriate default or initial setting.

32

bq2060A

Residual Capacity Factor C1 =RESIDUAL% * 2.56

EDV Thresholds and Near Full Percentage

RESIDUAL % is the desired battery capacity remaining

at EDV0 (RM = 0).

The bq2060A uses three pack voltage thresholds to pro-

vide voltage-based warnings of low battery capacity.

The bq2060A 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, ca-

pacity, and rate adjustment factors stored in EEPROM.

If EDV compensation is disabled then EDV0, EDV1,

andEDV2 are stored directly in mV in EE 0x72–0x73,

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

n

T is the current temperature in °K

R0 F_TZrepresents the resistance of the battery as a

function of temperature and capacity.

F

_TZ= f ( R1 , T0, T, C + C1, TC)

(11)

n

R0 is the first order rate dependency factor stored in

EDV R0 Factor EE 0x7a–0x7b.

For capacity correction at EDV2, Battery Low % EE

0 x5 4 ca n b e s e t a t

a d e s ir e d s t a t e -of-ch a r ge ,

STATEOFCHARGE%, in the range of 5 to 20%. Typical

values for STATEOFCHARGE% are 7–12% representing

7 –12% capacity.

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).

(7)

Battery Low % = STATEOFCHARGE% 2.56

The bq2060A updates FCC if a qualified discharge oc-

curs from a near-full threshold to EDV2. The desired

near-full threshold window, NFW (mAh), is programmed

in Near Full in EE 0x55.

n

R1 adjusts the variation of impedance with battery

capacity. R1 is programmed in EDV R1 Rate Factor

EE 0x7c–0x7d.

n

T0 adjusts the variation of impedance with battery

temperature. T0 is programmed in EDV T0 Rate

Factor EE 0x76–0x77.

NFW

2

(8)

Near Full =

EDV Discharge Rate and Temperature Com-

pensation

n

TC adjusts the variation of impedance for cold

temperature (T < 23°C). TC is programmed in EDV

TC EE 0x07.

If EDV compensation is enabled, the bq2060A calculates

battery voltage to determine EDV0, EDV1, and EDV2

thresholds as a function of battery capacity, tempera-

ture, and discharge load. (See Figures 7 and 8.) The gen-

eral equation for EDV0, EDV1, and EDV2 calculation is

F_CYis the factor that adjusts for changing cell imped-

ance as the battery pack is cycled:

F

_CY= f(A0, CycleCount())

(12)

where A0 is the EDV aging factor that is stored in EDV

A0 Factor EE 0x06. It should be set to 0 for most appli-

cations.

(9)

EDV0,1,2 = EMF F_BL- | I_LOAD

where

|

R0 F_TZF_CY

Typical values for the EDV compensation factors for a

Li-Ion 3s3p 18650 pack are

n

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.

EMF = 11550

T0 = 4475

C0 = 235

C1 = 0

n

I_LOADis the current discharge load.

F_BLis the factor that adjusts the EDV voltage for bat-

tery capacity and temperature to match the no-load

characteristics of the battery.

R0 = 5350

R1 = 250

A0 = 0

F_BL= f ( C0, C + C1, T )

(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.

TC = 3

The graphs in Figures 7 and 8 show the calculated

EDV0, EDV1, and EDV2 thresholds versus capacity us-

in g t h e t ypica l com pen sa t ion va lu es for differ en t

temperatures and loads for a Li-Ion 3s3p 18650 pack.

The compensation values vary widely for different cell

The Residual Capacity Factor is stored in the upper 5

bits of EE 0x78–0x79.

33

bq2060A

types and manufacturers and must be matched exactly

to the unique characteristics for optimal performance.

(15)

Charge Efficiency = 10 (EFF% - 74.5)

74.5 ≤ EFF% ≤ 100

where

Overload Current Threshold

The Overload Current threshold is a 16-bit value stored

in EE 0x46-0x47 in mA units.

ERR% is encoded in Efficiency Reduction Rate EE 0x65

according to the following equation:

ERR%

(16)

0.0125

Midrange Capacity Corrections

Efficiency Reduction Rate =

Three voltage-based thresholds, VOC25 EE 0x6c–0x6d,

VOC50 EE 0x6e–0x6f, and VOC75 EE 0x70–0x71, are

u s e d t o t e s t t h e a ccu r a cy of t h e R M b a s e d on

open-circuit pack voltages. These thresholds are stored

in the EEPROM in 2’s complement of voltage in mV.

The values represent the open-circuit battery voltage at

which the battery capacity should correspond to the as-

sociated state of charge for each threshold.

where

0 ≤ ERR% ≤ 3.19

The Efficiency Drop Off Percentage is stored in 2’s com-

plement of percent.

The bq2060A also adjusts the efficiency factors for tem-

perature. TEFF% defines the percent efficiency reduc-

tion per degree C over 25°C. TEFF% is encoded in Effi-

ciency Temperature Compensation EE 0x63 according to

the following equation

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:

(17)

TEFF%*1.6

Efficiency Temperature Compensation =

0.0125

æ

ö

÷

ø

52.73

(13)

ç

Self -Discharge Rate=256 -

where

è

%PERDAY

0 ≤ TEFF% ≤1.99

Light Load Current

The bq2060A applies all four charge-compensation fac-

tors when the CHEM bit in Pack Configuration is not

set denoting a nickel pack.

The amount of light load current in mA, ILEAK, used

for compensation is stored in Light Discharge Current in

EE 0x2b as follows:

(18)

Effective Charge Efficiency Reduction (nickel only)

= ERR%[RSOC() – EFF%] + TEFF%[T(°C) – 25]

where

ILEAK * 1024

(14)

Light Discharge Current =

45

ILEAK is between 0.044 and 11.2mA.

Charge Efficiency

RSOC() ≥ EFF% and T ≥ 25°C

The bq2060A uses four charge-efficiency factors to com-

pensate for charge acceptance. These factors are coded

in Charge Efficiency, Efficiency Reduction Rate, Effi-

ciency Drop Off Percentage, and Efficiency Temperature

Compensation.

If CHEM is set denoting a Li-Ion pack, the bq2060A ap-

plies only the value coded in High Charge Efficiency and

makes no other adjustments for charge acceptance.

Charge Limits and Termination

Techniques

The bq2060A applies the efficiency factor, EFF%, when

RelativeStateOfCharge() is less than the value coded in

E fficien cy Dr op Off P er cen t a ge E E 0x64. Wh en

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 P er cen ta ge. E F F % is en coded in H igh Ch a r ge

Efficiency EE 0x4d according to the following equation:

Charging Voltage

The 16-bit value, Charging Voltage EE 0x0a-0x0b pro-

grams the ChargingVoltage() value broadcast to a Smart

Charger. It is also sets the base value for determining

overvoltage conditions during charging and voltage com-

pliance during a constant-voltage charging methodology.

It is stored in mV.

34

bq2060A

Battery Low % =7%,Temperature = 35 C

Battery Low %= 7%, Load = 500mA

11500

11000

EDV2

11000

EDV2

10500

EDV1

10500

10000

EDV1

10000

9500

9000

8500

8000

7500

9500

9000

8500

8000

7500

35C/500mA

45C/500mA

20C/500mA

35C/1A

35C/2A

EDV0

7000

10

9

8

7

6

5

4

3

2

1

0

10

9

8

7

6

5

4

3

2

1

0

% Capacity

Figure 8. EDV Calculations vs. Capacity

for Various Loads

Figure 7. EDV Calculations vs. Capacity

for Various Temperatures

Fast Charging Current, Maintenance Charging Current,

and Pre-Charge Current are stored in mA.

Overvoltage

The 8-bit value, Overvoltage Margin EE 0x48, sets the

limit over ChargingVoltage() that is to be considered as Charge Suspension

an overvoltage charge-suspension condition. The volt-

During charge, the bq2060A compares the current to the

age in mV above the ChargingVoltage(), VOVM, that

s h ou ld t r igge r ch a r ge s u s p e n d is e n cod e d in

Overvoltage Margin as follows:

ChargingCurrent() plus the value IOIM. If the pack is

charged at a current above the ChargingCurrent() plus

IOIM, the bq2060A sets ChargingCurrent() to zero to

stop charging. IOIM is programmed in the EEPROM

value, Overcurrent Margin, encoded as follows:

a

VOVM

16

(19)

Overvoltage Margin =

VOVM is between 0 and 4080mV.

IOIM

16

(20)

Overcurrent Margin =

Charging Current

Overcurrent Margin EE 0x49 may be used to program

ChargingCurrent() values are either broadcast to a

Level 2 Sm a r t Ba t t er y Ch a r ger or r ea d fr om t h e

bq2060A by a Level 3 Smart Battery Charger. The

bq2060A sets the value of ChargingCurrent(), depending

on the charge requirements and charge conditions of the

pack.

IOIM values of 0 to 4080mA in 16mA steps.

The desired temperature threshold for charge suspen-

sion, MAXTEMP, may be programmed between 45°C

and 69°C in 1.6°C steps. Charge-suspension tempera-

ture is increased by 16° above the programmed value of

bit 5 in Miscellaneous Option EE 0x08 is set. MaxT

DeltaT EE 0x45 (most significant nibble) is stored in a

4-bit value as shown:

Wh en fa s t ch a r ge is a llowed , t h e bq2060A s et s

ChargingCurrent() to the rate programmed in Fa st

Charging Current EE 0x1a-0x1b.

é 69 -MAXTEMP ù

MaxT =

(21)

Wh en fa s t ch a r ge t er m in a t es , t h e bq2060A s et s

ChargingCurrent() to zero and then to the Maintenance

Charging Current EE 0x1c-0x1d when the termination

condition ceases.

ê

ú

û

ë

1.6

The bq2060A suspends fast charge when fast charge

continues past full by the amount programmed in Maxi-

mum Overcharge EE 0x2e-0x2f. Maximum Overcharge

is programmed in 2s complement form of charge in

mAh.

When Voltage() is less than EDV0, the bq2060A 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.

35

bq2060A

Hold-off

Time

Hold-off

Time (s)

Hold-off

Time

Hold-off

Time (s)

FULLY_CHARGED Bit Clear Threshold

Th e bq2060A clea r s t h e F ULLY_CH ARGE D bit in

BatteryStatus() when RelativeStateOfCharge() reaches

t h e va lu e, F u lly Ch a r ged Clea r % E E 0x4c. F u lly

Charged Clear % is an 8-bit value and is stored as a 2’s

complement of percent.

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

Fast Charge Termination Percentage

The bq2060A sets RM to a percentage of FCC on charge

termination if the CSYNC bit is set in the Pack Configu-

ration register. The percentage of FCC is stored in Fast

Charge Termination % in EE 0x4b. The value is stored

in 2’s complement of percent.

Current Taper Termination Characteristics

Two factors in the EEPROM set the current taper termi-

nation 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 oc-

curs 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 80s.

Cycle Count Threshold

Cycle Count Threshold 0x3c–0x3d sets the number of

mAh that must be removed from the battery to incre-

ment CycleCount(). Cycle Count Threshold is a 16-bit

value stored in 2’s complement of charge in mAh.

∆T/Dt 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.

CELLV

2

(23)

Current Taper Qual Voltage =

Current Taper Threshold =

RS* i

(24)

[

]

DeltaT*2 +16 / 10 é° Cù

0.5625

(22)

∆T/∆t =

ê

ú

ë

]

s

û

[

320 - DeltaT Time*20

where i = the desired current termination threshold in

mA, and R_S= VFC sense resistor in ohms.

DeltaT

D(°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

Pack Options

Pack Configuration

Pack Configuration EE 0x3f contains bit-programmable

features.

b3

b2

b1

b0

b7

b6

b5

b4

SEAL

DMODE

CSYNC CEDV

VCOR

CHEM LCC1 LCC0

DMODE

The DMODE bit determines whether the LED outputs

will in d ica t e Abs olu t eS t a t eOfCh a r ge() or

RelativeStateOfCharge()

60

40

20

0

1

LEDs reflect AbsoluteStateOfCharge()

LEDs reflect RelativeStateOfCharge()

DT/Dt Hold-off Timer Programming

The hold-off timer is programmed in the lower nibble of

Holdoff Time EE 0x4f. The hold-off time is 320s minus

20 times the Holdoff Time value.

36

bq2060A

SEAL

LCC0 and LCC1

The LCC0 and LCC1 bits configure the cell voltage in-

puts (VCELL_1–4).

The SEAL bit determines the SMBus access state of the

bq2060A on reset

0

SMBus commands (0x00–0xff) are accessible for

both read and write.

No. of Series

Cells

Cell Voltage

Inputs

LCC1 LCC0

NA

00

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

1

S MBu s r ea d a cces s is lim it ed t o com m a n d s

(0x05–0x1c) and (0x20–0x23). SMBus read/write

access is limited to commands (0x00–0x04), (0x2f),

and (0x3c–0x3f).

2

01

3

4

10

CSYNC

In usual operation of the bq2060A, the CSYNC bit is set

so that the coulomb counter is adjusted when a fast

charge termination is detected. In some applications, es-

pecially 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.

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 bq2060A uses the highest numbered cell voltage

input to measure the pack voltage measurement as re-

turned with Voltage(). For nickel chemistries or Li-Ion

without single-cell measurements, LCC0 and LCC1

must be set to 00. VCELL₄is the pack voltage input for

this programming.

0

The bq2060A does not alter RM at the time of a

valid charge termination.

1

The bq2060A updates RM with a programmed per-

centage of FCC at a valid charge termination.

CEDV

The CEDV bit determines whether the bq2060A imple-

ments automatic EDV compensation to calculate the

EDV0, EDV1 and EDV2 thresholds base on rate, tem-

perature, and capacity. If reset, the bq2060A uses the

fixed values programmed in EEPROM for EDV0, EDV1

and EDV2. If set the bq2060A calculates EDV0, EDV1

and EDV2.

Remaining Time and Capacity Alarms

Rem a in in g Tim e Ala r m in E E 0x02–0x03 a n d Re-

maining Capacity Alarm in 0x04–0x05set 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.

0

1

EDV compensation disabled

EDV compensation enabled

Secondary Protection Limits for Li-Ion

VCOR

The cell undervoltage (V_UV) and overvoltage (V_OV) limits

are programmed in Cell Undervoltage/ Over Voltage EE

0x4a according to the equations:

The VCOR bit enables the midrange voltage correction

algorithm. When set, the bq2060A compares the pack

voltage to RM and may adjust RM according to the val-

ues programmed in VOC25, VOC50, and VOC75.

VOV - 4096

32

(25)

Cell Undervoltage/ Overvoltage (lower) =

Cell Undervoltage/ Overvoltage (upper) =

0

1

Midrange corrections disabled

Midrange corrections enabled

VUV - 2048

(26)

64

CHEM

The CHEM bit configures the bq2060A for nickel packs

(NiCd or NiMH) or Li-Ion packs. When set the bq2060A

employs the configuration parameters in EEPROM des-

ignated for Li-Ion. When not set, the bq2060A employs

the configuration parameters designated for nickel.

0

1

The bq2060A uses nickel configuration parameters.

The bq2060A uses Li-Ion configuration parameters.

37

bq2060A

Cell Under/Over

Voltage

(upper nibble)

Cell Under/Over

Voltage

(lower nibble)

HIT

V_UV

(mV)

V_OV

(mV)

The HIT bit controls the available temperature range

for maximum temperature.

0

1

2

3

4

5

6

7

8

9

a

b

c

d

e

f

2048

2112

2176

2240

2304

2368

2432

2496

2560

2624

2688

2752

2816

2880

2944

3008

0

1

2

3

4

5

6

7

8

9

a

b

c

d

e

f

4096

4128

4160

4192

4224

4256

4288

4320

4352

4384

4416

4448

4480

4512

4544

4576

0

Ma xim u m t em per a t u r e set in n or m a l 45–85°C

range

1

Maximum temperature set in elevated 61–85°C

range

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 EE0x51 contains additional bit program-

mable features.

b7

b6

b5

b4

b3

b2

b1

b0

NDF

-

HPE CPE LED

SC

-

SM

S a fet y O ver t em p er a t u r e E E 0 x0 9 s e t s S a fe t y

Overtemperature Threshold (SOT) level for the CFC pin.

It can be programmed for a threshold of 69° to 85°C.

This range is increased by 16° if Miscellaneous Options

bit 5 = 1.

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

SafetyOvertemperature=(94.5 -SOT)*10

if Miscellaneous Options bit 5 = 0.

Digital filter disabled if SMBC and SMBD are high

SafetyOvertemperature=(110.5 -SOT)*10

if Miscellaneous Options bit 5 = 1.

HPE

The HPE bit enables/disables PEC transmissions to the

Smart Battery host for master mode alarm messages.

Miscellaneous Options

M i s cel l a n eou s

bit -pr ogr a m m a ble opt ion s. Bit s 0–4 sh ou ld be pr o-

grammed to zero.

O p t i on s

E E

0 x0 8

con t a in s

0

1

No PEC byte on alarm warning to host

PEC byte on alarm warning to host

CPE

b7

b6

b5

b4

b3

b2

b1

b0

The CPE bit enables/disables PEC transmissions to the

Smart Battery Charger for master mode alarm mes-

sages.

NE1 SOT HIT

0

NE1

0

1

No PEC byte on broadcasts to charger

PEC byte on broadcasts to charger

The NE1 bit disables the EDV1 threshold.

0

1

EDV1 enabled

EDV1 disabled

LED

SOT

The LED bit configures the bq2060A for 4 or 5 LED indi-

cation

The SOT bit controls override of the CFC pin for Safety

Overtemperature threshold.

0

1

Selects the 5 LED indication mode

Selects the 4 LED indication mode

0

CFC control with overvoltage, maximum tempera-

ture, and safety overtemperature.

1

CFC control; only with safety overtemperature.

38

bq2060A

The bq2060A compute the node voltages as follows:

SC

(27)

The SC bit enables learning cycle optimization for a

Smart Charger or independent charge

é

ùé

ù

ADC Voltage Gain

VCELL¹*32768

Vn1=

+ ADC Offset *

ê

úê

ú

ë

ûë

û

1250

65536

0

1

Learning cycle optimized for independent charger

Learning cycle optimized for Smart Charger

(28)

é

ù

VCELL2*32768

SM

Vn2=

+ ADC Offset *

ê

ú

ë

û

1250

The SM bit enables/disables master mode broadcasts by

the bq2060A

é

ù

ADC Voltage Gain + 8*(Cell 2 CalibrationFactor)

ê

ú

ë

û

65536

0

1

Broadcasts to host and charger enabled

Broadcasts to host and charger disabled

(29)

é

ù

VCELL³*32768

Vn3=

+ ADC Offset

*

ê

ú

I f t h e S M b it is s e t , m od ifica t ion s t o b it s in

BatteryMode() will not re-enable broadcasts.

ë

û

1250

ADC Voltage Gain + 8*(Cell 3 CalibrationFactor) *

[

]

é

ù

2

Measurement Calibration

ê

ú

ë

û

65536

ADC

(30)

To describe how the bq2060A calculates reported battery

and individual cell voltages, the following abbreviations

and designations are used:

é

ù

VCELL⁴*32768

Vn4=

+ ADC Offset *

ê

ú

ë

û

1250

ADC Voltage Gain + 8*(Cell 4 CalibrationFactor) *

[

]

VCE LL_1–4= volt a ges a t t h e in pu t pin s of t h e

bq2060A

é

ù

2

ê

ú

ë

û

65536

VCELL1–4 = reported cell voltages

Note: With LCC1-LCC0 = 00, Cell 4 Calibration

Factor = 0.

Vnl–4 = voltages at the different series nodes in the

battery

ADC Offset adjusts the ADC reading for voltage and cur-

rent measurements. ADC Offset is a signed 8-bit value

that cancels offset present in the circuit with no poten-

tial or current flow. ADC Offset is typically set between

-20 and 20.

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 bq2060A uses the computed node voltages to calcu-

late the reported voltages. It does not compute reported

cell voltages greater than the selected number of nodes.

If n o in dividu a l cell volt a ges a r e t o be m ea su r ed,

LCC1–LCC0 should be set to 00 and the top of the bat-

tery stack should be connected to a voltage divider to

the VCELL₄input.

The bq2060A 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 bq2060A. The bq2060A computes node voltages to

calculate the five reported voltages by the bq2060A:

Voltage(), VCELL1, VCELL2, VCELL3, and VCELL4.

The bq2060A computes the reported voltages as follows:

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

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 bq2060A

subtracts the voltage across the sense resistor from the

measurements so that the reported voltages reflect the

cell-stack voltages only.

VCELL3 = Vn3 - Vn2

VCELL2 = Vn2 - Vn1

VCELL1 = Vn1 - V_sr

39

bq2060A

Current

Constants and String Data

The bq2060A scales Current() to mA units by the 16-bit

va lu e ADC S en se Resistor Ga in in E E 0x68–0x69.

Adjusting ADC Sense Resistor Gain from its nominal

value provides a method to calibrate the current read-

ings for variances in the ADC gain, internal voltage ref-

erence, and sense resistor value. The bq2060A calculates

Current() by

EEPROM Constants

Check/ Byte 1 EE 0x00–0x01 and Check Byte 2 EE

0x7e–0x7f must be programmed to 0x3c7f and 0xa55a,

respectively.

Specification Information

Specification Information EE 0x14–0x15 stores the de-

fault value for the SpecificationInfo() function. It is

stored in EEPROM in the same format as the data re-

turned by the SepcificationInfo().

(31)

Current() =

[

]

(ADC Reading + ADC Offset)* ADC Sense Resistor Gain

16,384

Manufacture Date

Ma nufa cture Da te 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().

The nominal value for ADC Sense Resistor Gain is given

by equation (6).

VFC

Serial Number

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.

Serial Number EE 0x18–0x19 stores the default value

for t h e S er ia lN u m ber () fu n ct ion . I t is s t or ed in

EEPROM in the same format as the data returned by

the SerialNumber().

The nominal value of VFC Sense Resistor Gain is given

by equation (5).

Manufacturer Name Data

Manufacturer Name Length EE 0x20 stores the length

of t h e d e s ir e d s t r in g t h a t is r e t u r n e d b y t h e

ManufacturerName() function. Locations EE 0x21–0x2a

store the characters for ManufacturerName() in ASCII

code.Device Name Data

The bq2060A 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 ini-

tiated with commands to ManufacturerAccess().

The bq2060A calculates the offset with the calibration

routine and stores the calibration value using the least

21 bits of VFC Offset in EE 0x5e–0x60.

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.

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.

Device Chemistry Data

0.6V

(32)

Device Chemistry Length EE 0x40 stores the length of

t h e d e s ir e d s t r in g t h a t is r e t u r n e d b y t h e

DeviceChemistry() function. Locations EE 0x41–0x44

store the characters for DeviceChemistry() in ASCII

code.

OCV =

VFCuOffset19 – 0

Temperature

The bq2060A uses Temperature Offset in EE 0x61 to cali-

brate the Temperature() function for offset. The required

offset adjustment, TOFF (C), sets Temperature Offset ac-

cording to the equation

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.

Temperature Offset = TOFF _*10

(33)

where

-12.8 ≤ TOFF ≤12.7

40

bq2060A

Absolute Maximum Ratings

Symbol

Parameter

Minimum

-0.3

Maximum

+6.0

Unit

V

Notes

V

_CC—Supply voltage Relative to V_SS

V_IN–All other pins

T_OPR

Relative to V_SS

-0.3

+6.0

V

Operating

temperature

-20

+70

°C

Commercial

Note: Permanent device damage may occur if Absolu te Ma xim u m Ra tin gs are exceeded. Functional operation

should be limited to the Recommended DC Operating Conditions detailed in this data sheet. Exposure to

conditions beyond the operational limits for extended periods of time may affect device reliability.

DC Electrical Characteristics (V = 2.7–3.7V, T

= -20–70°C, Unless Otherwise Noted)

Minimum Typical Maximum

CC

OPR

Parameter

Conditions

Unit

Symbol

V_CC

Supply voltage

Operating current

2.7

3.3

180

5

3.7

235

10

V

I_CC

V_OUTinactive

1.5V < V_CC< 3.7V

V_OUTinactive

µA

I_SLP

Low-power storage mode current

V_OUTleakage current

I_LVOUT

-0.2

-5.0

0.2

V_OUTactive,

V_OUT= V_CC- 0.6V

I_VOUT

V_OUTsource current

mA

V

Output voltage low: LED₁–LED₅, CFC,

DFC

I_OLS= 5mA

0.4

V_OLS

Output voltage low: THON, CVON

Input voltage low DISP

0.36

0.8

V

V_IL

V_IH

-0.3

2.0

Input voltage high DISP

V_CC+ 0.3

Output voltage low SMBC, SMBD,

HDQ16, ESCL, ESDA

V_OL

V_ILS

V_IHS

V_AI

I_OL= 1.0mA

0.4

0.8

6.0

V

Input voltage low SMBC, SMBD,

HDQ16, ESCL, ESDA

-0.3

1.7

Input voltage high SMBC, SMBD,

HDQ16, ESCL, ESDA

Input voltage range VCELL_1–4, TS,

SRC

V_SS- 0.3

1.25

50

I_RB

V_RBI

Z_AI1

Z_AI2

RBI data-retention input current

RBI data-retention voltage

V_RBI> 3.0V, V_CC< 2.0V

10

nA

V

1.3

10

5

Input impedance: SR1, SR2

0–1.25V

MΩ

Input impedance: VCELL_1–4, TS, SRC

Note:

Z_AIspecifications are reference numbers based on process data.

41

bq2060A

VFC Characteristics (V_CC= 3.1–3.5V, T_OPR= 0–70°C Unless Otherwise Noted))

Symbol

Parameter

Conditions

Minimum Typical Maximum

Unit

Input voltage range, V_SR2

and V_SR1

V_SR

V_SR= V_SR2– V_SR1

–0.25

+0.25

V

_SR2= V_SR1, autocorrection

V_SROS

V_SRCOS

RM_VCO

V_SRinput offset

–250

–16

–50

0.8

250

+16

1.2

µV

disabled

Calibrated offset

Supply voltage gain

coefficient (see Note)

V_CC= 3.3V

%/V

Slope for T_OPR= –20 to 70°C

Total Deviation T_OPR= –20 to 70°C

Slope for T_OPR= –0 to 50°C

–0.09

–1.6

+0.09

0.1

%/°C

%

Temperature gain

coefficient (see note)

RM_TCO

–0.05

–0.6

+0.05

0.1

%/°C

%

Total Deviation T_OPR= –0 to 50°C

Integral nonlinearity

error

T_OPR= 0–50C

INL

0.21

%

Note: RM_TCOtotal deviation is from the nominal gain at 25°C.

REG Characteristics (T_OPR= -20–70°C)

Symbol

V_RO

Parameter

Conditions

Minimum Typical Maximum

Unit

V

J FET: R_ds(on) < 150Ω

V_gs(off) < –3.0V @ 10µA

REG controlled output voltage

REG output current

3.1

1.0

3.3

3.5

I_REG

µA

42

bq2060A

SMBus AC Specifications (V = 2.7–3.7V, T

= -20–70°C, Unless Otherwise Noted)

CC

OPR

Symbol

Parameter

Conditions

Min. Typ. Max. Unit

F_SMB

SMBus operating frequency

Slave mode, SMBC 50% duty cycle

10

100

kHz

µs

Master mode, no clock low slave

extend

F_MAS

T_BUF

SMBus master clock frequency

51.2

Bus free time between start and

stop

4.7

T_HD:STA

T_SU:STA

T_SU:STO

Hold time after (repeated) start

Repeated start setup time

Stop setup time

4.0

4.7

4.0

0

300

250

25

µs

ns

ms

µs

Receive mode

Transmit mode

T_HD:DAT

Data hold time

T_SU:DAT

T_TIMEOUT

T_LOW

Data setup time

Error signal/detect

Clock low period

Clock high period

See Note 1

35

4.7

4.0

T_HIGH

See Note 2

See Note 3

50

25

Cumulative clock low slave

extend time

Cumulative clock low master

extend time

T_LOW:SEXT

T_LOW:MEXT

Notes:

ms

See Note 4

10

1. The bq2060A will time out when any clock low exceeds T_TIMEOUT

.

2. T_HIGHMax. is minimum bus idle time. SMBC = SMBD = 1 for t > 50µs will cause reset of any

transaction involving bq2060A 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 bq2060A typically extends the clock only 20µs 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 mes-

sage from initial start to the stop. The bq2060A typically extends the clock only 20µs as a master in

the read byte or write byte protocol.

HDQ16 AC Specifications (V = 2.7–3.7V, T

= -20–70 C, Unless Otherwise Noted)

CC

OPR

Symbol

t_CYCH

Parameter

Conditions

Min. Typ. Max. Unit

Cycle time, host to bq2060A (write)

Cycle time, bq2060A to host (read)

190

-

µs

t_CYCB

205

250

Start hold time, host to bq2060A

(write)

t_STRH

5

-

ns

t_STRB

t_DSU

t_DSUB

t_DH

Start hold time, bq2060A to host (read)

Data setup time

32

-

50

-

µs

Data setup time

-

Data hold time

100

80

-

t_DV

Data valid time

-

t_SSU

t_SSUB

t_RSPS

t_B

Stop setup time

145

320

-

Stop setup time

-

Response time, bq2060A to host

Break time

190

40

t_BR

Break recovery time

-

43

bq2060A

SMBus Timing Data

HDQ16 Break Timing

t

BR

B

TD201803.eps

HDQ16 Host to bq2060A

Write "1"

Write "0"

t

STRH

t

DSU

t

DH

t

SSU

t

CYCH

HDQ16 bq2060A to Host

Read "1"

Read "0"

t

STRB

DSUB

t

DV

t

SSUB

t

CYCB

TD201805.eps

44

bq2060A

Ordering Information

bq2060A-E619 DBQ

Ta p e a n d Reel

blank = tubes

R = tape and reel

P a ck a ge Op tion :

DBQ = 28-pin SSOP

Device:

bq2060A SBS v1.1-Compliant Gas Gauge IC

45

IMPORTANT NOTICE

Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to dis-

continue any product or service without notice, and advise customers to obtain the latest version of rele-

vant information to verify, before placing orders, that information being relied on is current and complete.

All products are sold subject to the terms and conditions of sale supplied at the time of order acknowl-

edgement, including those pertaining to warranty, patent infringement, and limitation of liability.

TI warrants performance of its semiconductor products to the specifications applicable at the time of

sale in accordance with TI’s standard warranty. Testing and other quality control techniques are utilized

to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each de-

vice is not necessarily performed, except those mandated by government requirements.

CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL

RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE

(“CRITICAL APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHO-

RIZED, OR WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS

OR OTHER CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS

UNDERSTOOD TO BE FULLY AT THE CUSTOMER’S RISK.

In order to minimize risks associated with the customer’s applications, adequate design and operating

safeguards must be provided by the customer to minimize inherent or procedural hazards.

TI assumes no liability for applications assistance or customer product design. TI does not warrant or

represent that any license, either express or implied, is granted under any patent right, copyright, mask

work right, or other intellectual property right of TI covering or relating to any combination, machine, or

process in which such semiconductor products or services might be or are used. TI’s publication of in-

formation regarding any third party’s products or services does not constitute TI’s approval, warranty or

endorsement thereof.

46


型号：	BQ2060A-E619DBQG4
厂家：	TEXAS INSTRUMENTS
描述：	符合 SBS 1.1 标准的多化合物电量监测计，具有 5 个 LED 驱动器和其他电池管理控制 \| DBQ \| 28 \| -20 to 70 电池驱动光电二极管电源管理电路电源电路驱动器
文件：	总46页 (文件大小：716K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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