BQ2085 Datasheet, PDF (47/56 Pages) Texas Instruments – SBS-COMPLIANT GAS GAUGE IC FOR USE WITH THE bq29311

bq2085
SLUS541 – OCTOBER 2002
FULLY_CHARGED Bit Clear Threshold
The bq2085 clears the FULLY_CHARGED bit in BatteryStatus( ) when RelativeStateOfCharge( ) reaches the
value, Fully Charged Clear % DF 0x47. Fully Charged Clear % is an 8-bit value and is stored in percent.
Fast Charge Termination Percentage
The bq2085 sets RM to a percentage of FCC on charge termination if the CSYNC bit is set in the gauge
configuration register. The percentage of FCC, FCT%, is stored in Fast Charge Termination % in DF 0x46. The
value is stored as shown:
Fast Charge Termination% = (FCT% _* 2.56–1)
Cycle Count Initialization
Cycle Count DF 0x0c-0x0d stores the initial value for the CycleCount( ) function. It should be programmed to
0x0000.
Cycle Count Threshold
Cycle Count Threshold 0x37–0x38 sets the number of mAh that must be removed from the battery to increment
CycleCount( ). Cycle Count threshold is a 16-bit value stored in mAh.
Current Taper Termination Characteristics
Two factors in the data flash set the current taper termination for Li-Ion battery packs. The two locations are
Current Taper Qual Voltage DF 0x4a and Current Taper Threshold DF 0x48–0x49. Current taper termination
occurs during charging when the pack voltage is above or equal to the charging voltage minus the qualification
voltage, and the charging current is below the taper threshold for at least 40 seconds. Current Taper Qual
Voltage DF 0x4a is stored in mV and Current Taper Threshold DF 0x48–0x49 in mA.
Cell Balancing
Four constants set the cell balancing parameters. Cell Balance Threshold DF 0xd9–0xda sets the maximum
voltage in mV that each cell must achieve to initiate cell balancing. Cell Balance Window DF 0xd9–0xda sets
in mV the amount that the cell balance threshold can increase. Cell Balance Min DF 0xdb sets in mV the cell
differential that must exist to initiate cell balancing and Cell Balance Interval DF 0xdc sets the cell balancing time
interval in seconds. Programming Cell Balance Threshold to 65,535 disables cell balancing.
Pack Options
Pack Configuration
Pack Configuration DF 0x28 contains bit-programmable features.
b7
b6
b5
b4
b3
b2
b1
b0
DMODE
LED1
LED0
HPE
CPE
SM
CC1
CC0
DMODE
The DMODE bit determines whether the LED outputs indicate AbsoluteStateOfCharge( ) or
RelativeStateOfCharge( ).
0 LEDs reflect AbsoluteStateOfCharge( )
1 LEDs reflect RelativeStateOfCharge( )
LED1–LED0
The LED bits set the number of LEDs for Remaining Capacity ( ) indication.
0–1 Configures the bq2085 for three LEDs
1–0 Configures the bq2085 for four LEDs
1–1 or 0–0 Configures the bq2085 for five LEDs
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