BQ27425-G2_14 Datasheet, PDF (13/35 Pages) Texas Instruments – System-Side Impedance Track™ Fuel Gauge With Integrated Sense Resistor

bq27425-G2
www.ti.com
SLUSB23A – OCTOBER 2012 – REVISED FEBRUARY 2013
NominalAvailableCapacity( ): 0x08/0x09
This read-only command pair returns the uncompensated (less than C/20 load) battery capacity remaining. Units
are mAh.
FullAvailableCapacity( ): 0x0a/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.
RemainingCapacity( ): 0x0c/0x0d
This read-only command pair returns the compensated battery capacity remaining. Units are mAh.
FullChargeCapacity( ): 0x0e/0f
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.
AverageCurrent( ): 0x10/0x11
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.
AveragePower( ): 0x18/0x19
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.
StateOfCharge( ): 0x1c/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%.
IntTemperature( ): 0x1e/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 OpConfig[TEMPS] = 0, this command will return the same value as
Temperature( ).
StateOfHealth( ): 0x20/0x21
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 = –400mA).
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
• 0x04-0xFF: Reserved
Copyright © 2012–2013, Texas Instruments Incorporated
Product Folder Links: bq27425-G2
Submit Documentation Feedback
13