BQ2085-V1P3 Datasheet, PDF (24/57 Pages) Texas Instruments – SBS-COMPLIANT GAS GAUGE IC FOR USE WITH THE bq29311

bq2085-V1P3
SLUS598 − FEBRUARY 2004
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SMBus protocol: Read or write word
Input/Output: Unsigned integer—the point below which remaining time messages are sent.
Units: Minutes
Range: 0 to 65,535 minutes
Granularity: Not applicable
Accuracy: See AverageTimeToEmpty( ).
BatteryMode( ) (0x03)
Description: Selects the various battery operational modes and reports the battery’s mode and requests.
Defined modes include
D Whether the battery capacity information is specified in units of mAh or 10 mWh (CAPACITY_MODE bit)
D Whether the ChargingCurrent( ) and ChargingVoltage( ) values are broadcast to the smart battery charger
when the CHARGER_MODE bit is set.
D Whether all broadcasts to the smart battery charger and host are disabled
The defined request condition is the battery requesting a conditioning cycle (RELEARN_FLAG).
Purpose: The CAPACITY_MODE bit allows power management systems to best match their electrical
characteristics with those reported by the battery. For example, a switching power supply represents a constant
power load, whereas a linear supply is better represented by a constant current model. The CHARGER_MODE
bit allows a SMBus host or smart battery charger to override the smart battery desired charging parameters
by disabling the bq2085−V1P3 broadcasts. The RELEARN_FLAG bit allows the bq2085−V1P3 to request a
conditioning cycle.
SMBus protocol: Read or write word
Input/Output: Unsigned integer—bit mapped— see below.
Units: Not applicable
Range: 0-1
Granularity: Not applicable
Accuracy: Not applicable
The BatteryMode( ) word is divided into two halves, the MSB (bits 8-15) which is read/write and the LSB (bits
0-7) which is read only. The bq2085−V1P3 forces bits 0-6 to zero and prohibits writes to bit 7.
Table 12 summarizes the meanings of the individual bits in the BatteryMode( ) word and specifies the default
values, where applicable, are noted.
INTERNAL_CHARGE_CONTROLLER bit is not used by the bq2085−V1P3.
PRIMARY_BATTERY_SUPPORT bit is not used by the bq2085−V1P3.
RELEARN_FLAG bit set indicates that the bq2085−V1P3 is requesting a capacity relearn cycle for the battery.
The bq2085−V1P3 sets the RELEARN_FLAG on a full reset and if it detects 20 cycle counts without an FCC
update. The bq2085−V1P3 clears this flag after a learning cycle has been completed.
CHARGE_CONTROLLER_ENABLED bit is not used by the bq2085−V1P3. The bq2085−V1P3 forces this bit
to zero.
PRIMARY_BATTERY bit is not used by the bq2085−V1P3. The bq2085−V1P3 forces this bit to zero.
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