bq20z45-R1

SLUS992 – DECEMBER 2009

www.ti.com

COMMUNICATIONS

The bq20z45-R1 uses SMBus v1.1 with Master Mode and package error checking (PEC) options per the SBS

specification.

SMBus On and Off State

The bq20z45-R1 detects an SMBus off state when SMBC and SMBD are logic-low for

≥ 2 seconds. Clearing this

state requires either SMBC or SMBD to transition high. Within 1 ms, the communication bus is available.

SBS Commands

Table 2. SBS COMMANDS

SBS

Size in

Min

Max

Mode

Name

Default Value

Unit

Cmd

Format

Bytes

Value

Value

0x00

R/W

ManufacturerAccess

hex

2

0x0000

0xffff

—

—

0x01

R/W

RemainingCapacityAlarm

unsigned int

2

0

65535

300

mAh or 10mWh

0x02

R/W

RemainingTimeAlarm

unsigned int

2

0

65535

10

min

0x03

R/W

BatteryMode

hex

2

0x0000

0xe383

—

—

0x04

R/W

AtRate

signed int

2

–32768

32767

—

mA or 10mW

0x05

R

AtRateTimeToFull

unsigned int

2

0

65534

—

min

0x06

R

AtRateTimeToEmpty

unsigned int

2

0

65534

—

min

0x07

R

AtRateOK

unsigned int

2

0

65535

—

—

0x08

R

Temperature

unsigned int

2

0

65535

—

0.1°K

0x09

R

Voltage

unsigned int

2

0

65535

—

mV

0x0a

R

Current

signed int

2

–32768

32767

—

mA

0x0b

R

AverageCurrent

signed int

2

–32768

32767

—

mA

0x0c

R

MaxError

unsigned int

1

0

100

—

%

0x0d

R

RelativeStateOfCharge

unsigned int

1

0

100

—

%

0x0e

R

AbsoluteStateOfCharge

unsigned int

1

0

100+

—

%

0x0f

R/W

RemainingCapacity

unsigned int

2

0

65535

—

mAh or 10mWh

0x10

R

FullChargeCapacity

unsigned int

2

0

65535

—

mAh or 10mWh

0x11

R

RunTimeToEmpty

unsigned int

2

0

65534

—

min

0x12

R

AverageTimeToEmpty

unsigned int

2

0

65534

—

min

0x13

R

AverageTimeToFull

unsigned int

2

0

65534

—

min

0x14

R

ChargingCurrent

unsigned int

2

0

65534

—

mA

0x15

R

ChargingVoltage

unsigned int

2

0

65534

—

mV

0x16

R

BatteryStatus

unsigned int

2

0x0000

0xffff

—

—

0x17

R/W

CycleCount

unsigned int

2

0

65535

—

—

0x18

R/W

DesignCapacity

unsigned int

2

0

65535

4400

mAh or 10mWh

0x19

R/W

DesignVoltage

unsigned int

2

7000

16000

14400

mV

0x1a

R/W

SpecificationInfo

unsigned int

2

0x0000

0xffff

0x0031

—

0x1b

R/W

ManufactureDate

unsigned int

2

0

65535

01-Jan-1980

—

0x1c

R/W

SerialNumber

hex

2

0x0000

0xffff

0x0001

—

0x20

R/W

ManufacturerName

String

20+1

—

—

Texas Inst.

—

0x21

R/W

DeviceName

String

20+1

—

—

bq20z45-R1

—

0x22

R/W

DeviceChemistry

String

4+1

—

—

LION

—

0x23

R

ManufacturerData

String

14+1

—

—

—

—

0x2f

R/W

Authenticate

String

20+1

—

—

—

—

0x3c

R

CellVoltage4

unsigned int

2

0

65535

—

mV

0x3d

R

CellVoltage3

unsigned int

2

0

65535

—

mV

0x3e

R

CellVoltage2

unsigned int

2

0

65535

—

mV

0x3f

R

CellVoltage1

unsigned int

2

0

65535

—

mV

14

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