BQ2084-V140_14 Datasheet, PDF (40/64 Pages) Texas Instruments – SBS v1.1-COMPLIANT GAS GAUGE FOR USE WITH THE bq29312

bq2084-V140
SLUS664B – JULY 2005 – REVISED AUGUST 2006
Units: Minutes
Range: 0 to 65,534 min
Granularity: 2 min or better
Accuracy: -0, +MaxError() * FullChargeCapacity() / AverageCurrent()
Invalid Data Indication: 65,535 indicates battery is not being discharged.
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AverageTimeToFull() (0x13)
Description: Returns a predicted remaining time until the battery reaches full charge (minutes), based on
AverageCurrent.
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: Read word
Output: Unsigned integer—remaining time in minutes.
Units: Minutes
Range: 0 to 65,534 minutes
Granularity: 2 minutes or better
Accuracy: -0, +MaxError() * FullChargeCapacity() / AverageCurrent()
Invalid Data Indication: 65,535 indicates the battery is not being charged.
ChargingCurrent() (0x14)
Description: Returns the desired charging rate in mA.
Purpose: The ChargingCurrent() function sets the maximum charge current of the battery.
TheChargingCurrent() value should be used in combination with the ChargingVoltage() value to set the charger's
operating point. Together, these functions permit the bq2084-V140 to dynamically control the charging profile
(current/voltage) of the battery. The bq2084-V140 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: Read word
Output: Unsigned integer—maximum charger output current in mA.
Units: mA
Range: 0 to 65,535 mA
Granularity: 1 mA
Accuracy: Not applicable
Invalid Data Indication: 65,535 indicates that a charger should operate as a voltage source outside its
maximum regulated current range.
ChargingVoltage() (0x15)
Description: Returns the desired charging voltage in mV.
Purpose: The ChargingVoltage() function sets the maximum charge voltage of the battery. The
ChargingVoltage() value should be used in combination with the ChargingCurrent() value to set the charger's
operating point. Together, these functions permit the bq2084-V140 to dynamically control the charging profile
(current/voltage) of the battery. The charger may be operated as a constant-current source above its maximum
regulated voltage range by returning a ChargingVoltage() value of 65,535.
SMBus protocol: Read word
Output: Unsigned integer—charger output voltage in mV.
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