BQ27541-V200_17 Datasheet, PDF (14/46 Pages) Texas Instruments – Single Cell Li-Ion Battery Fuel Gauge for Battery Pack Integration

bq27541-V200
Not Recommended for New Designs
SLUSA11B – FEBRUARY 2010 – REVISED SEPTEMBER 2013
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Flags( ): 0x0a/0x0b
This read-only function returns the contents of the gas-gauge status register, depicting the current operating
status.
High Byte
Low Byte
bit7
OTC
OCVTAKEN
Table 4. Flags Bit Definitions
bit6
OTD
–
bit5
bit4
bit3
bit2
–
–
CHG_INH
XCHG
–
–
–
SOC1
bit1
FC
SOCF
bit0
CHG
DSG
OTC = Over-Temperature in Charge condition is detected. True when set.
OTD = Over-Temperature in Discharge condition is detected. True when set.
CHG_INH = Charge Inhibit indicates the temperature is outside the range [Charge Inhibit Temp Low, Charge Inhibit Temp
High]. True when set.
XCHG = Charge Suspend Alert indicates the temperature is outside the range [Suspend Temperature Low, Suspend
Temperature High].
Full-charged is detected. FC is set when charge termination is reached and FC Set% = -1 (See the Charging and
FC = Charge Termination Indication section for details) or State of Charge is larger than FC Set% and FC Set% is not -1.
True when set.
CHG = (Fast) charging allowed. True when set.
OCVTAKEN = Cleared on entry to relax mode and set to 1 when OCV measurement is performed in relax.
SOC1 = State-of-Charge-Threshold 1 (SOC1 Set) reached. True when set.
SOCF = State-of-Charge-Threshold Final (SOCF Set %) reached. True when set.
DSG = Discharging detected. True when set.
NominalAvailableCapacity( ): 0x0c/0x0d
This read-only command pair returns the uncompensated (less than C/20 load) battery capacity remaining. Units
are mAh.
FullAvailableCapacity( ): 0x0e/0x0f
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( ): 0x10/0x11
This read-only command pair returns the compensated battery capacity remaining. Units are mAh.
FullChargeCapacity( ): 0x12/13
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( ): 0x14/0x15
This read-only command pair returns a signed integer value that is the average current flow through the sense
resistor. It is updated every 1 second. Units are mA.
TimeToEmpty( ): 0x16/0x17
This read-only function returns an unsigned integer value of the predicted remaining battery life at the present
rate of discharge, in minutes. A value of 65,535 indicates battery is not being discharged.
TimeToFull( ): 0x18/0x19
This read-only function returns an unsigned integer value of predicted remaining time until the battery reaches
full charge, in minutes, based upon AverageCurrent( ). The computation accounts for the taper current time
extension from the linear TTF computation based on a fixed AverageCurrent( ) rate of charge accumulation. A
value of 65,535 indicates the battery is not being charged.
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