BQ2085-V1P2 Datasheet, PDF (46/56 Pages) Texas Instruments – SBS-COMPLIANT GAS GAUGE IC FOR USE WITH THE bq29311

bq2085−V1P2
SLUS590 − DECEMBER 2003
www.ti.com
Fast Charge Termination% = (FCT% _* 2.56−1)
Cycle Count Initialization
Cycle Count DF 0x0c-0x0d stores the initial value for the CycleCount( ) function. Program it 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−V1P2 for three LEDs
1−0 Configures the bq2085−V1P2 for four LEDs
1−1 or 0−0 Configures the bq2085−V1P2 for five LEDs
HPE
The HPE bit enables/disables PEC transmissions to the smart battery host for master mode alarm messages.
0 No PEC byte on alarm warning to host
1 PEC byte on alarm warning to host
CPE
The CPE bit enables/disables PEC transmissions to the smart battery charger for master mode messages.
0 No PEC byte on broadcasts to charger
1 PEC byte on broadcasts to charger
SM
The SM bit enables/disables master mode broadcasts by the bq2085−V1P2.
46