BQ2084-V140_14 Datasheet, PDF (54/64 Pages) Texas Instruments – SBS v1.1-COMPLIANT GAS GAUGE FOR USE WITH THE bq29312

bq2084-V140
SLUS664B – JULY 2005 – REVISED AUGUST 2006
CC1–CC0
The CC bits configure the bq2084-V140 for the number of series cells in the battery pack.
1-1 Configures the bq2084-V140 for four series cells
1-0 Configures the bq2084-V140 for three series cells
0-1 Configures the bq2084-V140 for two series cells
Gauge Configuration
Gauge Configuration DF 0x29 contains bit-programmable features:
b7
b6
b5
FEDV0
CSYNC
SC
b4
CEDV
b3
EDVV
b2
OVSEL
b1
VCOR
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b0
OTVC
FEDV0
When this bit is set, the EDV0 voltage is fixed while the EDV1 and EDV2 are left as compensated values if
CEDV is also set. When this bit is set, the compensated values of EDV1 and EDV2 are limited from going
below EDV0.
0 EDV0 acted upon per CEDV bit setting
1 EDV0 fixed regardless of CEDV setting
CSYNC
In usual operation of the bq2084-V140, 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 bq2084-V140 does not alter RM at the time of a valid charge termination.
1 The bq2084-V140 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 bq2084-V140 implements automatic EDV compensation to calculate the
EDV0, EDV1, and EDV2 thresholds base on rate, temperature, and capacity. If the bit is cleared, the
bq2084-V140 uses the fixed values programmed in data flash for EDV0, EDV1, and EDV2. If the bit is set, the
bq2084-V140 calculates EDV0, EDV1, and EDV2.
0 EDV compensation disabled
1 EDV compensation enabled
EDVV
The EDVV bit selects whether EDV termination is to be done with regard to Voltage () or the lowest single-cell
voltage.
0 EDV conditions determined on the basis of the lowest single-cell voltage
1 EDV conditions determined on the basis of Voltage()
OVSEL
The OVSEL bit determines if Safety Over Voltage is based on Voltage () or highest cell voltages.
0 Safety overvoltage based on Voltage ()
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