BQ2085-V1P2 Datasheet, PDF (28/56 Pages) Texas Instruments – SBS-COMPLIANT GAS GAUGE IC FOR USE WITH THE bq29311

bq2085−V1P2
SLUS590 − DECEMBER 2003
www.ti.com
Units: 0.1°K
Range: 0 to +6553.5°K {real range}
Granularity: 0.1°K
Accuracy: ±1.5°K (from ideal Semitec 103AT thermistor performance, after calibration)
Voltage( ) (0x09)
Description: Returns the cell-pack voltage (mV).
Purpose: The Voltage( ) function provides power management systems with an accurate battery terminal
voltage. Power management systems can use this voltage, along with battery current information, to
characterize devices they control. This ability helps enable intelligent, adaptive power-management systems.
SMBus protocol: Read word
Output: Unsigned integer—battery terminal voltage in mV.
Units: mV
Range: 0 to 20,000 mV
Granularity: 1 mV
Accuracy: ±0.25% (after calibration)
Current( ) (0x0a)
Description: Returns the current being supplied (or accepted) by the battery (mA).
Purpose: The Current( ) function provides a snapshot for the power management system of the current flowing
into or out of the battery. This information is of particular use in power-management systems because they can
characterize individual devices and tune their operation to actual system power behavior.
SMBus protocol: Read word
Output: Signed integer—charge/discharge rate in mA increments-positive for charge, negative for discharge.
Units: mA
Range: −32,768 to 32,767 mA
Granularity: 1 mA
Accuracy: 0.25% or 5 mA, whichever is greater
AverageCurrent( ) (0x0b)
Description: Returns a value that approximates a one-minute rolling average of the current being supplied
(or accepted) through the battery terminals (mA). The AverageCurrent( ) function returns values equivalent to
Current( ) during the battery’s first minute of operation.
Purpose: The AverageCurrent( ) function provides the average current flowing into or out of the battery for
the power management system.
SMBus protocol: Read word
Output: Signed integer—charge/discharge rate in mA increments-positive for charge, negative for discharge.
Units: mA
Range: −32,768 to 32,767 mA
Granularity: 1 mA
Accuracy: 0.25% or 5 mA, whichever is greater
MaxError( ) (0x0c)
Description: Returns the expected margin of error (%) in the state of charge calculation. For example, when
MaxError( ) returns 10% and RelativeStateOfCharge( ) returns 50%, the Relative StateOfCharge( ) is more
likely between 50% and 60%. The bq2085−V1P2 sets MaxError( ) to 100% on a full reset. The bq2085−V1P2
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