BQ27520-G2 Datasheet, PDF (15/47 Pages) Texas Instruments – System-Side Impedance Track™ Fuel Gauge With Integrated LDO

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bq27520-G2
SLUSAB7A – MARCH 2011 – REVISED AUGUST 2011
Table 4-4. Flags Bit Definitions
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
High byte
OTC
OTD
–
–
CHG_INH
XCHG
FC
CHG
Low byte
–
–
OCV_GD
WAIT_ID
BAT_DET
SOC1
SYSDOWN
DSG
OTC = Overtemperature in charge condition is detected. True when set. SOC_INT will toggle once if set.
OTD = Overtemperature in discharge condition is detected. True when set. SOC_INT will toggle once if set.
CHG_INH = Charge inhibit: unable to begin charging (temperature outside the range [Charge Inhibit Temp Low, Charge Inhibit Temp
High]). True when set.
XCHG = Charge suspend alert (temperature outside the range [Suspend Temperature Low, Suspend Temperature High]). True when
set.
FC = Full-charged condition reached. Set when charge termination condition is met. (RMFCC=1; Set FC_Set % = -1% when RMFCC = 0).
True when set
CHG = (Fast) charging allowed. True when set.
OCV_GD = Good OCV measurement taken. True when set.
WAIT_ID = Waiting to identify inserted battery. True when set.
BAT_DET = Battery detected. True when set.
SOC1 = State-of-charge threshold 1 (SOC1 Set) reached. The flag is enabled when BL_INT bit in Operation Configuration B is set. True
when set.
SysDown = SystemDown bit indicating the system shut down. Refer to the Data Flash SysDown parameters for threshold settings. True
when set. SOC_INT will toggle once if set.
DSG = Discharging detected. True when set.
4.1.1.7 NominalAvailableCapacity( ): 0x0c/0x0d
This read-only command pair returns the uncompensated (less than C/20 load) battery capacity
remaining. Units are mAh.
4.1.1.8 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.
4.1.1.9 RemainingCapacity( ): 0x10/0x11
This read-only command pair returns the remaining battery capacity which is compensated for the present
conditions of load, temperature and battery age. RemainingCapacity( ) is typically lower than the
uncompensated NominalAvailableCapacity( ). Units are mAh.
4.1.1.10 FullChargeCapacity( ): 0x12/13
This read-only command pair returns the capacity of the battery when fully charged with compensation for
the present conditions of temperature and battery age. FullChargeCapacity( ) is updated at regular
intervals, as specified by the IT algorithm typically lower than the uncompensated
FullAvailableCapacity( )and . Units are mAh.
4.1.1.11 AverageCurrent( ): 0x14/0x15
This read-only command pair returns a signed integer value that is the average current flow through the
sense resistor. AverageCurrent( )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.
4.1.1.12 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.
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GENERAL DESCRIPTION
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