BQ2084-V140_14 Datasheet, PDF (38/64 Pages) Texas Instruments – SBS v1.1-COMPLIANT GAS GAUGE FOR USE WITH THE bq29312

bq2084-V140
SLUS664B – JULY 2005 – REVISED AUGUST 2006
www.ti.com
Purpose: The MaxError() function has real value in two ways: first, to give the user a confidence level about the
state of charge and second, to give the power management system information about how aggressive it should
be, particularly as the battery nears the end of its life.
SMBus protocol: Read word
Output: Unsigned integer—percent uncertainty for selected information.
Units: %
Range: 2-100%
Granularity: 1%
Accuracy: Not applicable
RelativeStateOfCharge() (0x0d)
Description: Returns the predicted remaining battery capacity expressed as a percentage of
FullChargeCapacity() (%).
Purpose: The RelativeStateOfCharge() function is used to estimate the amount of charge remaining in the
battery relative to the last learned capacity.
SMBus protocol: Read word
Output: Unsigned integer-percent of remaining capacity.
Units: %
Range: 0-100%
Granularity: 1%
Accuracy: -0, +MaxError()
AbsoluteStateOfCharge()(0x0e)
Description: Returns the predicted remaining battery capacity expressed as a percentage of DesignCapacity()
(%). Note that AbsoluteStateOfCharge() can return values greater than 100%.
Purpose: The AbsoluteStateOfCharge() function is used to estimate the amount of charge remaining in the
battery relative to the nominal or DesignCapacity().
SMBus protocol: Read word
Output: Unsigned integer—percent of remaining capacity.
Units: %
Range: 0-100+%
Granularity: 1%
Accuracy: -0, +MaxError()
RemainingCapacity() (0x0f)
Description: Returns the predicted charge or energy remaining in the battery. The RemainingCapacity() value is
expressed in either charge or energy, depending on the setting of the BatteryMode() CAPACITY_MODE bit.
Purpose: The RemainingCapacity() function returns the battery's remaining capacity. This information is a
numeric indication of remaining charge or energy given by the AbsoluteStateOfCharge() or
RelativeStateOfCharge() functions and may be in a better form for use by power management systems.
SMBus protocol: Read word
Output: Unsigned integer—remaining charge in units of mAh or 10 mWh.
38
Submit Documentation Feedback