BQ27425-G2_15 Datasheet, PDF (19/39 Pages) Texas Instruments – Fuel Gauge With Integrated Sense Resistor

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bq27425-G2
SLUSB23B – OCTOBER 2012 – REVISED JUNE 2015
8.5.1.2 Temperature( ): 0x02 and 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.
8.5.1.3 Voltage( ): 0x04 and 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.
8.5.1.4 Flags( ): 0x06 and 0x07
This read-word function returns the contents of the gas gauge status register, depicting the current operating
status.
High Byte
Low Byte
BIT 7
OT
OCVTAKEN
BIT 6
UT
RSVD
Table 6. Flags Bit Definitions
BIT 5
RSVD
ITPOR
BIT 4
RSVD
CFGUPMODE
BIT 3
RSVD
BAT_DET
BIT 2
EEFAIL
SOC1
BIT 1
FC
SOCF
BIT 0
CHG
DSG
High Byte
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 = Bits 5:3 are 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.
Low Byte
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. See CONFIG UPDATE Mode for details.
BAT_DET = Battery insertion detected. True when set. When Op Config [BIE] is set, [BAT_DET] is set by detecting a logic-high-to-
low transition at BIN pin. When Op Config [BIE] is low, [BAT_DET] is set when host issues BAT_INSERT subcommand
and is 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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