BQ27541-V200_1007 Datasheet, PDF (16/43 Pages) Texas Instruments – Single Cell Li-Ion Battery Fuel Gauge for Battery Pack Integration

bq27541-V200
SLUSA11 – FEBRUARY 2010
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StateOfHealth( ): 0x2e/0x2f
0x2e SOH percentage: this read-only function returns an unsigned integer value, expressed as a percentage of
the ration of predicted FCC(25°C, SOH current rate) over the DesignCapacity(). The FCC(25°C, SOH current
rate) is the calculated full charge capacity at 25°C and the SOH current rate which is specified in the data flash
(State of Health Load I). The range of the returned SOH percentage is 0x00 to 0x64, indicating 0 to 100%
correspondingly.
0x2f SOH Status: this read-only function returns an unsigned integer value, indicating the status of the SOH
percentage. The meanings of the returned value are:
• 0x00: SOH not valid (initialization)
• 0x01: Instant SOH value ready
• 0x02: Initial SOH value ready
– Calculation based on uncompensated Qmax
– Updated at first grid point update after cell insertion
• 0x03: SOH value ready
– Utilize the updated Qmax update
– Calculation based on compensated Qmax
– Updated after complete charge and relax is complete
• 0x04-0xFF: Reserved
PassedCharge( ): 0x34/0x35
This signed integer indicates the amount of charge passed through the sense resistor since the last IT simulation
in mAh.
DOD0( ): 0x36/0x37
This unsigned integer indicates the depth of discharge during the most recent OCV reading.
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