bq20z95

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SLUS757C – JULY 2007 – REVISED OCTOBER 2013

COMMUNICATIONS

The bq20z95 uses SMBus v1.1 with MASTER mode and package error checking (PEC) options per the SBS

specification.

SMBus On and Off State

The bq20z95 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

Default

Mode

Name

Format

Unit

Cmd

Bytes

Value

Value

Value

0x00

R/W

ManufacturerAccess

hex

2

0x0000

0xffff

—

0x01

R/W

RemainingCapacityAlarm

unsigned int

2

0

65535

—

mAh or

10 mWh

0x02

R/W

RemainingTimeAlarm

unsigned int

2

0

65535

—

min

0x03

R/W

BatteryMode

hex

2

0x0000

0xffff

—

0x04

R/W

AtRate

signed int

2

–32768

32767

—

mA or 10

mW

0x05

R

AtRateTimeToFull

unsigned int

2

0

65535

—

min

0x06

R

AtRateTimeToEmpty

unsigned int

2

0

65535

—

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

20000

—

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

10 mWh

0x10

R

FullChargeCapacity

unsigned int

2

0

65535

—

mAh or

10 mWh

0x11

R

RunTimeToEmpty

unsigned int

2

0

65535

—

min

0x12

R

AverageTimeToEmpty

unsigned int

2

0

65535

—

min

0x13

R

AverageTimeToFull

unsigned int

2

0

65535

—

min

0x14

R

ChargingCurrent

unsigned int

2

0

65535

—

mA

0x15

R

ChargingVoltage

unsigned int

2

0

65535

—

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

—

mAh or

10 mWh

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

0

0x1c

R/W

SerialNumber

hex

2

0x0000

0xffff

0x0001

0x20

R/W

ManufacturerName

String

11+1

—

—

Texas

ASCII

Instruments

0x21

R/W

DeviceName

String

7+1

—

—

bq20z95

ASCII

0x22

R/W

DeviceChemistry

String

4+1

—

—

LION

ASCII

0x23

R

ManufacturerData

String

14+1

—

—

—

ASCII

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