BQ2040 Datasheet, PDF (22/33 Pages) Texas Instruments – Gas Gauge IC With SMBus Interface

bq2040
Table 9. BatteryStatus Bits
Bit Name
OVER_CHARGED_ALARM
TERMINATE_CHARGE_ALARM
OVER_TEMP_ALARM
TERMINATE_DISCHARGE_ALARM
REMAINING_CAPACITY_ALARM
REMAINING_TIME_ALARM
Bit Name
INITIALIZED
DISCHARGING
FULLY_CHARGED
FULLY_DISCHARGED
Alarm Bits
Set When:
Reset When:
The bq2040 detects a ∆T/∆t or cur-
rent taper termination. (Note:
∆T/∆t and current taper are valid
charge terminations.)
A discharge occurs or when the
∆T/∆t or current taper termination
condition ceases during charge.
The bq2040 detects an over-current,
over-voltage, over-temperature,
∆T/∆t, or current taper condition
during charge.
A discharge occurs or when all condi-
tions causing the event cease.
The bq2040 detects that its internal
temperature is greater than the pro-
grammed value.
Internal temperature falls to 43°C or
the maximum temperature threshold
minus 5°C.
The bq2040 determines that it has
supplied all the charge that it can
without being damaged (Voltage <
EDVF).
Voltage > EDVF signifies that the
battery has reached a state of charge
sufficient for it to once again safely
supply power.
The bq2040 detects that the Remain-
ingCapacity is less than that set by
the RemainingCapacityAlarm func-
tion.
Either the value set by the Remain-
ingCapacityAlarm function is lower
than the Remaining Capacity or the
RemainingCapacity is increased by
charging.
The bq2040 detects that the esti-
mated remaining time at the present
discharge rate is less than that set
by the RemainingTimeAlarm func-
tion.
Either the value set by the Remain-
ingTimeAlarm function is lower than
the AverageTimeToEmpty or a valid
charge is detected.
Status Bits
Set When:
Reset When:
The bq2040 loads from the EEPROM
(bit 7 set in EE0x0c).
A bad EEPROM load is detected.
The bq2040 determines that it is not Battery detects that it is being
being charged.
charged.
The bq2040 determines a valid
charge termination or a maximum
overcharge state.
RM discharges below the full charge
percentage.
bq2040 determines that it has
supplied all the charge that it can
without being damaged.
RelativeStateOfCharge is greater
than or equal to 20%
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