Datasheet

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COMMUNICATIONS

SMBus On and Off State

SBS Commands

bq20z45

SLUS800 – MARCH 2009 ..................................................................................................................................................................................................

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

specification.

The bq20z45 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.

Table 1. 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 —

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

Product Folder Link(s): bq20z45