BQ2063_15 Datasheet, PDF (14/60 Pages) Texas Instruments – SBS v1.1-COMPLIANT Li-ION GAS-GAUGE IC

bq2063
Not Recommended For New Designs
SBS v1.1ĆCOMPLIANT LiĆION GASĆGAUGE IC
WITH PROTECTOR INTERFACE
SLUS468E− MAY 2001 − REVISED APRIL 2002
D Temperature: The bq2063 requests the precharge rate when Temperature( ) is between 0°C and the low
temperature fault (LTF) threshold programmed in MaxT_LowT. Temperature( ) must be equal to or greater
than the LTF threshold to allow the fast-charge rate. The LTF threshold is programmed in the lower nibble
of MaxT_LowT EE 0x45.
charge suspension
The bq2063 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 bq2063 measures the charge current to be more
than Overcurrent Margin plus ChargingCurrent( ). Overcurrent Margin is programmed in EE 0x49. On
detecting an overcurrent condition, the bq2063 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 bq2063 measures the battery voltage to be more
than Overvoltage Margin plus ChargingVoltage( ), or when a Li-Ion cell voltage has exceeded the
overvoltage limit programmed in Cell Under/Overvoltage. Overvoltage Margin is programmed in EE 0x48
and Cell Under/Over Voltage in EE 0x4a. On detecting an overvoltage condition, the bq2063 sets the
ChargingCurrent( ) to zero and sets the TERMINATE_CHARGE_ALARM bit in BatteryStatus( ). The
bq2063 clears the TERMINATE_ CHARGE_ALARM bit when it detects that the battery is no longer being
charged (DISCHARGING bit set in BatteryStatus( )). The bq2063 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 Overvoltage Margin and all cell voltages are
less than the Cell Under/Over Voltage threshold.
D Overtemperature: An overtemperature condition exists when Temperature( ) is greater than or equal to the
Max T value programmed in EE 0x45 (MSN). On detecting an overtemperature condition, the bq2063 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 (MaxT −5°C) 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 EE 0x2e-0x2f. On detecting an overcharge
condition, the bq2063 sets the ChargingCurrent( ) to zero and sets the OVER_CHARGED_ALARM,
TERMINATE_CHARGE_ ALARM, and FULLY_CHARGED bits in BatteryStatus( ). The bq2063 clears the
OVER_ CHARGED_ALARM and TERMINATE_CHARGE_ ALARM when it detects that the battery is no
longer being charged. The FULLY_CHARGED bit remains set and the bq2063 continues to broadcast zero
charging current until RelativeStateOfCharge( ) is less than Fully Charged Clear% programmed in EE 0x4c.
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 bq2063 sets ChargingCurrent( ) to zero. The bq2063 sets ChargingCurrent( )
to the appropriate precharge rate or fast-charge rate when Temperature( ) ≥ 0°C.
primary charge termination
The bq2063 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 bq2063 detects a current taper termination when the pack voltage is greater than
ChargingVoltage( ) minus Current Taper Qual Voltage in EE 0x4f and the charging current is below a
threshold determined by Current Taper Threshold in EE 0x4e, for at least 40 seconds. The bq2063 uses the
VFC to measure current for current taper termination. The current must also remain above 0.5625/Rs mA to
qualify the termination condition.
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