BQ2085 Datasheet, PDF (49/56 Pages) Texas Instruments – SBS-COMPLIANT GAS GAUGE IC FOR USE WITH THE bq29311

bq2085
SLUS541 – OCTOBER 2002
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 pack or highest cell voltages.
0 Safety over voltage based on pack voltage
1 Safety over voltage based on highest cell voltage multiplied by the number of cells and then compared
to the safety voltage
VCOR
The VCOR bit enables the midrange voltage correction algorithm. When it is set, the bq2085 compares the pack
voltage to RM and may adjust RM according to the values programmed in VOC25, VOC50, and VOC75.
0 Continuous midrange corrections disabled
1 Continuous midrange corrections enabled
OTVC
The OTVC bit programs the bq2085 to perform a midrange voltage one time after a device reset.
0 One-time midrange correction disabled
1 One-time midrange correction enabled
Safety Control
Secondary Protection Limits for Li-Ion
The cell undervoltage (VUV) and overvoltage (VOV) limits are programmed in Cell Under and Cell Over Voltage
DF 0x62–0x63, DF 0x60–0x61, respectively. Both values are stored in mV. Cell Over Voltage Reset DF 0xef
and Cell Under Voltage Reset 0xd1–0xd2 set the reset points in mV for these safety parameters.
SAFE Threshold
The safety voltage threshold is programmed in Safety Over Voltage DF 0x68–0x69. It is stored in mV.
If Misc Configuration bit 2 (OVSEL) = 0 then Safety Over Voltage is based on pack voltage, but if OVSEL = 1,
then it is based on highest cell voltage.
The safety overtemperature (SOT) in °C is programmed in Safety Over Temperature DF 0x6a–0x6b. It is stored
as
SafetyOvertemperature +
SOT
0.1
(12)
AFE Configuration
The AFE protection limits are programmed as specified in the bq29311 data sheet.
AFE Brnout/Shutdn 0xb1 sets the brownout and shutdown voltage levels
AFE Over Curr Dsg DF 0xb2 sets the overcurrent threshold on discharge.
AFE Over Curr Chg DF 0xb3 sets the overcurrent threshold on charge.
AFE Over Curr Delay DF 0xb4 sets the delay timing for over current in the charge and discharge direction.
AFE Short Circ Thresh DF 0xb6 sets the short circuit threshold and
AFE Short Circuit Delay DF 0xb7 sets the short circuit delay time.
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