Datasheet

bq27541-G1

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SLUSAL6C –NOVEMBER 2011–REVISED OCTOBER 2012

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 (UnfilteredRM()) when the

[SmoothEn] bit in Operating Configuration C is cleared or filtered compensated battery capacity remaining

(FilteredRM()) when [SmoothEn] is set. Units are mAh.

FullChargeCapacity( ): 0x12/13

This read-only command pair returns the compensated capacity of fully charged battery (UnfilteredFCC()) when

the [SmoothEn] bit in Operating Configuration C is cleared or filtered compensated capacity of fully charged

battery (FilteredFCC()) when [SmoothEn] is set. 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.

FilteredFCC( ): 0x18/0x19

This read-only command pair returns the filtered compensated capacity of the battery when fully charged when

the [SmoothEn] bit in Operating Configuration C is set. Units are mAh. FilteredFCC() is updated at regular

intervals, as specified by the IT algorithm.

StandbyCurrent( ): 0x1a/0x1b

This read-only function returns a signed integer value of the measured system standby current through the sense

resistor. The StandbyCurrent( ) is an adaptive measurement. Initially it reports the standby current programmed

in Initial Standby, and after spending some time in standby, reports the measured standby current.

The register value is updated every 1 second when the measured current is above the Deadband and is less

than or equal to 2 x 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 current

measured average current.

UnfilteredFCC( ): 0x1c/0x1d

This read-only command pair returns the compensated capacity of the battery when fully charged. Units are

mAh. UnFilteredFCC() is updated at regular intervals, as specified by the IT algorithm.

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