Datasheet

bq20z655
SLUSAH8A –APRIL 2011–REVISED MAY 2012 www.ti.com
COMMUNICATIONS
The bq20z655 uses SMBus v1.1 with Master Mode and package error checking (PEC) options per the SBS
specification.
SMBus On and Off State
The bq20z655 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
VALUE
CMD BYTES VALUE VALUE
0x00 R/W ManufacturerAccess Hex 2 0x0000 0xffff — —
0x01 R/W RemainingCapacityAlarm Integer 2 0 700 or 1000 300 or 432 mAh or 10 mWh
0x02 R/W RemainingTimeAlarm Unsigned 2 0 30 10 min
integer
0x03 R/W BatteryMode Hex 2 0x0000 0xffff — —
0x04 R/W AtRate Integer 2 –32,768 32,767 — mA or 10 mW
0x05 R AtRateTimeToFull Unsigned 2 0 65,535 — min
integer
0x06 R AtRateTimeToEmpty Unsigned 2 0 65,535 — min
integer
0x07 R AtRateOK Unsigned 2 0 65,535 — —
integer
0x08 R Temperature Unsigned 2 0 65,535 — 0.1°K
integer
0x09 R Voltage Unsigned 2 0 20,000 — mV
integer
0x0a R Current Integer 2 –32,768 32767 — mA
0x0b R AverageCurrent Integer 2 –32,768 32,767 — mA
0x0c R MaxError Unsigned 1 0 100 — %
integer
0x0d R RelativeStateOfCharge Unsigned 1 0 100 — %
integer
0x0e R AbsoluteStateOfCharge Unsigned 1 0 100+ — %
integer
0x0f R/W RemainingCapacity Unsigned 2 0 65,535 — mAh or 10 mWh
integer
0x10 R FullChargeCapacity Unsigned 2 0 65,535 — mAh or 10 mWh
integer
0x11 R RunTimeToEmpty Unsigned 2 0 65,534 — min
integer
0x12 R AverageTimeToEmpty Unsigned 2 0 65,534 — min
integer
0x13 R AverageTimeToFull Unsigned 2 0 65,534 — min
integer
0x14 R ChargingCurrent Unsigned 2 0 65,534 — mA
integer
0x15 R ChargingVoltage Unsigned 2 0 65,534 — mV
integer
0x16 R BatteryStatus Hex 2 0x0000 0xdbff — —
0x17 R/W CycleCount Unsigned 2 0 65,535 0 —
integer
0x18 R/W DesignCapacity Integer 2 0 32,767 4400 or 6336 mAh or 10 mWh
0x19 R/W DesignVoltage Integer 2 7000 18,000 14,400 mV
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