BQ27510_08 Datasheet, PDF(12/36 Page) Texas Instruments – System-Side Impedance Track™ Fuel Gauge With Direct Battery Connection

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bq27510

SLUS816A â MARCH 2008 â REVISED JUNE 2008.......................................................................................................................................................... www.ti.com

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. 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.

StandbyCurrent( ): 0x1a/0x1b

This read-only function returns a signed integer value of the measured 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 current 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.

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.

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