BQ2060SS Datasheet, PDF (30/59 Pages) Texas Instruments – SBS V1.1-COMPLIANT GAS GAUGE IC

bq2060
SLUS035E – JANUARY 2000 – REVISED OCTOBER 2005
Invalid Data Indication: 65,535 indicates battery is not being discharged.
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AverageTimeToEmpty() (0x12); [0x12]
DESCRIPTION
Returns a 1-minute rolling average of the predicted remaining battery life (minutes). The
AverageTimeToEmpty() value is calculated based on either current or power depending on the
setting of the BatteryMode()’s CAPACITY_MODE bit.
PURPOSE
The AverageTimeToEmpty() displays state-of-charge information in a more useful way. It averages
the instantaneous estimations so that the remaining time does not appear to jump around.
SMBus PROTOCOL ReadWord
OUTPUT
Unsigned integer—minutes of operation left.
Units: minutes
Range: 0 to 65,534 min
Granularity: 2 min or better
Accuracy: –0, +MaxError() x FullChargeCapacity() / AverageCurrent()
Invalid Data Indication: 65,535 indicates battery is not being discharged.
AverageTimeToFull() (0x13); [0x13]
DESCRIPTION
Returns a 1-minute rolling average of the predicted remaining time until the battery reaches full
charge (minutes).
PURPOSE
The AverageTimeToFull() function can be used by the SMBus Host’s power management system
to aid in its policy. It may also be used to find out how long the system must be left on to achieve
full charge.
SMBus PROTOCOL ReadWord
OUTPUT
Unsigned integer —remaining time in minutes.
Units: minutes
Range: 0 to 65,534 min
Granularity: 2 min or better
Accuracy: MaxError() x FullChargeCapacity() / AverageCurrent()
Invalid Data Indication: 65,535 indicates the battery is not being charged.
ChargingCurrent() (0x14); [0x14]
DESCRIPTION
Returns the desired charging rate in mA.
PURPOSE
The ChargingCurrent() function sets the maximum charge current of the battery. The
ChargingCurrent() value should be used in combination with the ChargingVoltage() value to set the
charger’s operating point. Together, these functions permit the bq2060 to dynamically control the
charging profile (current/ voltage) of the battery. The bq2060 can effectively turn off a charger by
returning a value of 0 for this function. The charger may be operated as a constant-voltage source
above its maximum regulated current range by returning a ChargingCurrent() value of 65,535.
SMBus PROTOCOL ReadWord
OUTPUT
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