BQ27425-G2_15 Datasheet, PDF (20/39 Pages) Texas Instruments – Fuel Gauge With Integrated Sense Resistor

bq27425-G2
SLUSB23B – OCTOBER 2012 – REVISED JUNE 2015
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8.5.1.5 NominalAvailableCapacity( ): 0x08 and 0x09
This read-only command pair returns the uncompensated (less than C/20 load) battery capacity remaining. Units
are mAh.
8.5.1.6 FullAvailableCapacity( ): 0x0A and 0x0B
This read-only command pair returns the uncompensated (less than C/20 load) capacity of the battery when fully
charged. Units are mAh. FullAvailableCapacity( ) is updated at regular intervals, as specified by the IT algorithm.
8.5.1.7 RemainingCapacity( ): 0x0C and 0x0D
This read-only command pair returns the compensated battery capacity remaining. Units are mAh.
8.5.1.8 FullChargeCapacity( ): 0x0E and 0x0F
This read-only command pair returns the compensated capacity of the battery when fully charged. Units are
mAh. FullChargeCapacity( ) is updated at regular intervals, as specified by the IT algorithm.
8.5.1.9 AverageCurrent( ): 0x10 and 0x11
This read-only command pair returns a signed integer value that is the average current flow through the sense
resistor. In NORMAL mode, it is updated once per second and is calculated by dividing the 1-second change in
coulomb counter data by 1 second. Large current spikes of short duration will be averaged out in this
measurement. Units are mA.
8.5.1.10 AveragePower( ): 0x18 and 0x19
This read-only function returns an signed integer value of the average power during battery charging and
discharging. It is negative during discharge and positive during charge. A value of 0 indicates that the battery is
not being discharged. The value is reported in units of mW.
8.5.1.11 StateOfCharge( ): 0x1C and 0x1D
This read-only function returns an unsigned integer value of the predicted remaining battery capacity expressed
as a percentage of FullChargeCapacity( ), with a range of 0 to 100%.
8.5.1.12 IntTemperature( ): 0x1E and 0x1F
This read-only function returns an unsigned integer value of the internal temperature sensor in units of 0.1°K
measured by the fuel gauge. If Op Config [TEMPS] = 0, this command will return the same value as
Temperature( ).
8.5.1.13 StateOfHealth( ): 0x20 and 0x21
0x20 SOH percentage: this read-only function returns an unsigned integer value, expressed as a percentage of
the ratio of predicted FCC(25°C, SOH LoadI) over the DesignCapacity(). The FCC(25°C, SOH LoadI) is the
calculated full charge capacity at 25°C and the SOH LoadI which is programmed in factory (default = –400 mA).
The range of the returned SOH percentage is 0x00 to 0x64, indicating 0 to 100% correspondingly.
0x21 SOH Status: this read-only function returns an unsigned integer value, indicating the status of the SOH
percentage:
• 0x00: SOH not valid (initialization)
• 0x01: Instant SOH value ready
• 0x02: Initial SOH value ready
– Calculation based on default Qmax
– May not reflect SOH for currently inserted pack
• 0x03: SOH value ready
– Calculation based on learned Qmax
– Most accurate SOH for currently inserted pack following a Qmax update
• 0x04 through 0xFF: Reserved
20
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