BQ2083-V1P3 Datasheet, PDF (15/56 Pages) Texas Instruments – SBS-COMPLIANT GAS GAUGE IC FOR USE WITH THE bq29311

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bq2083-V1P3
SLVS508 − OCTOBER 2003
Charge Suspension
The bq2083−V1P3 may temporarily suspend charge if it detects a charging fault. A charging fault includes the
following conditions.
D Overcurrent: An overcurrent condition exists when the bq2083−V1P3 measures the charge current to be equal
to or greater than Overcurrent Margin plus ChargingCurrent( ). Overcurrent Margin is programmed in DF
0x5c−0x5d. On detecting an overcurrent condition, the bq2083−V1P3 sets the ChargingCurrent( ) to zero and
sets the TERMINATE_CHARGE_ALARM bit in Battery Status( ). The overcurrent condition and TERMINATE_
CHARGE_ALARM are cleared when the measured current drops below Overcurrent Margin.
D Overvoltage: An overvoltage condition exists when the bq2083−V1P3 measures the battery voltage to be more
than Over Voltage Margin plus ChargingVoltage( ), or when a cell voltage has exceeded the overvoltage limit
programmed in Cell Over Voltage. Over Voltage Margin is programmed in DF 0x5a−0x5b and Cell Over Voltage
in DF 0x60. On detecting an overvoltage condition, the bq2083−V1P3 sets the ChargingCurrent( ) to zero and
sets the TERMINATE_CHARGE_ALARM bit in BatteryStatus( ). The bq2083−V1P3 clears the TERMINATE_
CHARGE_ALARM bit when it detects that the battery is no longer being charged (DISCHARGING bit set in
BatteryStatus( )). The bq2083−V1P3 continues to broadcast zero charging current until the overvoltage
condition is cleared. The overvoltage condition is cleared when the measured battery voltage drops below the
ChargingVoltage( ) plus the Over Voltage Margin and all cell voltages are less than the Cell Over Voltage Reset
threshold in DF 0xcf, 0xd0.
D Overtemperature: An overtemperature condition exists when Temperature( ) is greater than or equal to the Max
Temperature value programmed in DF 0x53, 0x54. On detecting an overtemperature condition, the
bq2083−V1P3 sets the ChargingCurrent( ) to zero and sets the OVER_TEMP_ALARM and
TERMINATE_CHARGE_ ALARM bit in BatteryStatus( ) and the CVOV bit in pack status. The overtemperature
condition is cleared when Temperature( ) is equal to or below (Max Temperature − Temperature Hysteresis DF
0x55, 0x56) or 43°C.
D Overcharge: An overcharge condition exists if the battery is charged more than the Maximum Overcharge value
after RM = FCC. Maximum Overcharge is programmed in DF 0x4e-0x4f. On detecting an overcharge condition,
the bq2083−V1P3 sets the ChargingCurrent( ) to zero and sets the OVER_CHARGED_ALARM and
TERMINATE_CHARGE_ ALARM bits in BatteryStatus( ). The bq2083−V1P3 clears the
TERMINATE_CHARGE_ ALARM when it detects that the battery is no longer being charged and clears the
OVER_CHARGED_ALARM when 2mAh of discharge are measured. The FULLY_CHARGED bit remains set
and the bq2083−V1P3 continues to broadcast zero charging current until RelativeStateOfCharge( ) is less than
Fully Charged Clear% programmed in DF 0x47. The counter used to track overcharge capacity is reset with 2
mAh of discharge.
D Undertemperature: An undertemperature condition exists if Temperature( ) < 0°C. On detecting an under
temperature condition, the bq2083−V1P3 sets ChargingCurrent( ) to zero. The bq2083−V1P3 sets
ChargingCurrent( ) to the appropriate precharge rate or fast-charge rate when Temperature( ) ≥ 0°C.
Primary Charge Termination
The bq2083−V1P3 terminates charge if it detects a charge-termination condition based on current taper. A
charge-termination condition includes the following:
For current taper, ChargingVoltage( ) must be set to the pack voltage desired during the constant-voltage phase
of charging. The bq2083−V1P3 detects a current taper termination when the pack voltage is greater than or equal
to ChargingVoltage( ) minus Current Taper Qual Voltage in DF 0x4a and the charging current is below a threshold
determined by Current Taper Threshold in DF 0x48−0x49 and above 22.5 mA for two consecutive 40-second
intervals.
Once the bq2083−V1P3 detects a Primary Charge Termination, the bq2083−V1P3 sets the
TERMINATE_CHARGE_ALARM and FULLY_CHARGED bits in BatteryStatus( ), and sets the
ChargingCurrent( ) to the maintenance charge rate as programmed in Maintenance Charging Current DF 0x3f,
0x40. On termination, the bq2083−V1P3 also sets RM to a programmed percentage of FCC, provided that
RelativeStateOfCharge( ) is below the desired percentage of FCC and the CSYNC bit in Gauge Configuration DF
0x29 is set. The programmed percentage of FCC, Fast Charge Termination %, is set in DF 0x46. The
bq2083−V1P3 clears the FULLY_CHARGED bit when RelativeStateOfCharge( ) is less than the programmed
Fully Charged Clear %. The bq2083−V1P3 broadcasts the fast-charge rate when the FULLY_CHARGED bit is
cleared and voltage and temperature permit. The bq2083−V1P3 clears the TERMINATE_CHARGE_ALARM
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