BQ2085 Datasheet, PDF (48/56 Pages) Texas Instruments – SBS-COMPLIANT GAS GAUGE IC FOR USE WITH THE bq29311

bq2085
SLUS541 – OCTOBER 2002
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.
0 Broadcasts to host and charger enabled
1 Broadcasts to host and charger disabled
If the SM bit is set, modifications to bits in BatteryMode( ) do not re-enable broadcasts.
CC1–CC0
The CC bits configure the bq2085 for the number of series cells in the battery pack.
1–1 Configures the bq2085 for four series cells
1–0 Configures the bq2085 for three series cells
Gauge Configuration
Gauge Configuration DF 0x29 contains bit-programmable features:
b7
b6
b5
0
CSYNC
SC
b4
CEDV
b3
EDVV
b2
OVSEL
b1
VCOR
b0
OTVC
CSYNC
In usual operation of the bq2085, the CSYNC bit is set so that the coulomb counter is adjusted when a fast
charge termination is detected. In some applications, especially those where an externally controlled charger
is used, it may be desirable not to adjust the coulomb counter. In these cases the CSYNC bit should be cleared.
0 The bq2085 does not alter RM at the time of a valid charge termination.
1 The bq2085 updates RM with a programmed percentage of FCC at a valid charger termination.
SC
The SC bit enables learning cycle optimization for a Smart Charger or independent charge.
1 Learning cycle optimized for independent charger
0 Learning cycle optimized for Smart Charger
CEDV
The CEDV bit determines whether the bq2085 implements automatic EDV compensation to calculate the EDV0,
EDV1, and EDV2 thresholds base on rate, temperature, and capacity. If the bit is cleared, the bq2085 uses the
fixed values programmed in data flash for EDV0, EDV1, and EDV2. If the bit is set, the bq2085 calculates EDV0,
EDV1, and EDV2.
0 EDV compensation disabled
1 EDV compensation enabled
48
www.ti.com