BQ27425-G2_14 Datasheet, PDF (12/35 Pages) Texas Instruments – System-Side Impedance Track™ Fuel Gauge With Integrated Sense Resistor

bq27425-G2
SLUSB23A – OCTOBER 2012 – REVISED FEBRUARY 2013
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Temperature( ): 0x02/0x03
This read-/write-word function returns an unsigned integer value of the temperature in units of 0.1 K measured by
the fuel gauge. If Op Config[TEMPS] bit = 0 (default), a read command will return the internal temperature sensor
value and write command will be ignored. If Op Config[TEMPS] bit = 1, a write command sets the temperature to
be used for gauging calculations while a read command returns to temperature previously written.
Voltage( ): 0x04/0x05
This read-only function returns an unsigned integer value of the measured cell-pack voltage in mV with a range
of 0 to 6000 mV.
Flags( ): 0x06/0x07
This read-word function returns the contents of the gas-gauge status register, depicting the current operating
status.
High Byte
Low Byte
bit7
OT
OCVTAKEN
bit6
UT
RSVD
Table 4. Flags Bit Definitions
bit5
RSVD
ITPOR
bit4
RSVD
CFGUPMODE
bit3
RSVD
BAT_DET
bit2
EEFAIL
SOC1
bit1
FC
SOCF
bit0
CHG
DSG
OT = Over-Temperature condition is detected. [OT] is set when Temperature( ) ≥ Over Temp (default = 55 °C). [OT] is cleared
when Temperature( ) < Over Temp - Temp Hys.
UT = Under-Temperature condition is detected. [UT] is set when Temperature( ) ≤ Under Temp (default = 0 °C). [UT] is
cleared when Temperature( ) > Under Temp + Temp Hys.
RSVD = Reserved.
RSVD = Reserved.
RSVD = Reserved.
EEFAIL = EEPROM Write Fail. True when set. This bit is set after a single EEPROM write failure. All subsequent EEPROM writes
are disabled. A power on reset or RESET subcommand is required to clear the bit to re-enable EEPROM writes.
FC = Full-charge is detected. If the FC Set% (default =100%) is a positive threshold , [FC] is set when SOC ≥ FC Set % and is
cleared when SOC ≤ FC Clear % (default = 98%). Alternatively, if FC Set% = -1, [FC] is set when the fuel gauge has
detected charge termination.
CHG = Fast charging allowed. If the TCA Set% (Terminate Charge Alarm Set %) is a positive threshold (default = 99%), [CHG]
is cleared when SOC ≥ TCA Set % and is set when SOC ≤ TCA Clear % (default = 95%). Alternatively, if TCA Set% = -
1, the TCA thresholds are disabled and the [CHG] bit is cleared when the fuel gauge has detected a taper condition.
OCVTAKEN = Cleared on entry to relax mode and Set to 1 when OCV measurement is performed in relax
RSVD = Reserved.
ITPOR = Indicates a Power On Reset or RESET subcommand has occurred. True when set. This bit is cleared after the
SOFT_RESET subcommand is received.
CFGUPMODE = Fuel gauge is in CONFIG UPDATE mode. True when set. Default is 0. Refer to CONFIG UPDATE Mode section for
details.
BAT_DET = Battery insertion detected. True when set. When OpConfig[BIE]] is set, [BAT_DET] is set by detecting a logic high to low
transition at BIN pin. when OpConfig[BIE]] is low, [BAT_DET] is set when host issues BAT_INSERT subcommand and
clear when host issues BAT_REMOVE subcommand.
SOC1 = If set, StateOfCharge() <= SOC1 Set Threshold. The [SOC1] bit will remain set until StateOfCharge() >= SOC1 Clear
Threshold.
SOCF = If set, StateOfCharge() <= SOCF Set Threshold. The [SOCF] bit will remain set until StateOfCharge() >= SOCF Clear
Threshold.
DSG = Discharging detected. True when set.
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