BQ27620-G1 Datasheet, PDF (15/45 Pages) Texas Instruments – System-Side Impedance Track™ Fuel Gauge

bq27620-G1
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SLUSAE3 – OCTOBER 2012
4.1.1.10 EffectiveCurrent( ): 0x14/0x15
This read-only command pair returns a signed integer value that is taken from the Effective current
Calculation being used by DVC algorithm. Units are mA.
4.1.1.11 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.
4.1.1.12 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 EffectiveCurrent( ). The computation accounts for the taper
current time extension from the linear TTF computation based on a fixed EffectiveCurrent( ) rate of charge
accumulation. A value of 65,535 indicates the battery is not being charged.
4.1.1.13 StandbyCurrent( ): 0x1a/0x1b
This read-only function returns a signed integer value of the measured standby current from the Effective
Current Calculation. The StandbyCurrent( ) is an adaptive measurement. Initially it reports the standby
current programmed in Initial Standby, and after spending several seconds in standby, reports the
measured standby current.
The register value is updated every 1 second when the effective current is above the Deadband and is
less than or equal to 2 × Initial Standby. The first and last values that meet this criteria are not averaged
in, since they may not be stable values. To approximate a 1 minute time constant, each new
StandbyCurrent( ) value is computed by taking approximate 93% weight of the last standby current and
approximate 7% of the effective current calculation.
4.1.1.14 StandbyTimeToEmpty( ): 0x1c/0x1d
This read-only function returns an unsigned integer value of the predicted remaining battery life at the
standby rate of discharge, in minutes. The computation uses Nominal Available Capacity (NAC), the
uncompensated remaining capacity, for this computation. A value of 65,535 indicates battery is not being
discharged.
4.1.1.15 MaxLoadCurrent( ): 0x1e/0x1f
This read-only function returns a signed integer value, in units of mA, of the maximum load conditions.
The MaxLoadCurrent( ) is an adaptive measurement which is initially reported as the maximum load
current programmed in Initial Max Load Current. If the effective current calculation is ever greater than
Initial Max Load Current, then MaxLoadCurrent( ) updates to the new current calculation.
MaxLoadCurrent( ) is reduced to the average of the previous value and Initial Max Load Current whenever
the battery is charged to full after a previous discharge to an SOC less than 50%. This prevents the
reported value from maintaining an unusually high value.
4.1.1.16 MaxLoadTimeToEmpty( ): 0x20/0x21
This read-only function returns an unsigned integer value of the predicted remaining battery life at the
maximum load current discharge rate, in minutes. A value of 65,535 indicates that the battery is not being
discharged.
4.1.1.17 AvailableEnergy( ): 0x22/0x23
This read-only function returns an unsigned integer value of the predicted charge or energy remaining in
the battery. The value is reported in units of mWh.
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