BQ2040SN-C408 BENCHMARQ, BQ2040SN-C408 Datasheet - Page 22

• Manufacturer Part Number: BQ2040SN-C408
• Description: BATTERY CHARGE MONITOR, SMD, 2040
• Manufacturer: BENCHMARQ

Specifications of BQ2040SN-C408

• Battery Management Function: Charger, Status Monitor
• Battery Type: Li-Ion / NiCd / NiMH
• Supply Voltage Range: 3V To 6.5V
• Battery Ic Case Style: SOIC
• No. Of Pins: 16
• Operating Temperature Range: 0°C
• Interface Type: 2-Wire, Serial

bq2040
OVER_CHARGED_ALARM
TERMINATE_CHARGE_ALARM
OVER_TEMP_ALARM
TERMINATE_DISCHARGE_ALARM
REMAINING_CAPACITY_ALARM
REMAINING_TIME_ALARM
INITIALIZED
DISCHARGING
FULLY_CHARGED
FULLY_DISCHARGED
Bit Name
Bit Name
The bq2040 detects a T/ t or cur-
rent taper termination. (Note:
charge terminations.)
The bq2040 detects an over-current,
over-voltage, over-temperature,
during charge.
The bq2040 detects that its internal
temperature is greater than the pro-
grammed value.
The bq2040 determines that it has
supplied all the charge that it can
without being damaged (Voltage <
EDVF).
The bq2040 detects that the Remain-
ingCapacity is less than that set by
the RemainingCapacityAlarm func-
tion.
The bq2040 detects that the esti-
mated remaining time at the present
discharge rate is less than that set
by the RemainingTimeAlarm func-
tion.
The bq2040 loads from the EEPROM
(bit 7 set in EE0x0c).
The bq2040 determines that it is not
being charged.
The bq2040 determines a valid
charge termination or a maximum
overcharge state.
bq2040 determines that it has
supplied all the charge that it can
without being damaged.
Table 9. BatteryStatus Bits
T/ t and current taper are valid
T/ t, or current taper condition
Status Bits
Alarm Bits
Set When:
Set When:
22
A discharge occurs or when the
condition ceases during charge.
A discharge occurs or when all condi-
tions causing the event cease.
Internal temperature falls to 43°C or
the maximum temperature threshold
minus 5 C.
Voltage > EDVF signifies that the
battery has reached a state of charge
sufficient for it to once again safely
supply power.
Either the value set by the Remain-
ingCapacityAlarm function is lower
than the Remaining Capacity or the
RemainingCapacity is increased by
charging.
Either the value set by the Remain-
ingTimeAlarm function is lower than
the AverageTimeToEmpty or a valid
charge is detected.
A bad EEPROM load is detected.
Battery detects that it is being
charged.
RM discharges below the full charge
percentage.
RelativeStateOfCharge is greater
than or equal to 20%
T/ t or current taper termination
Reset When:
Reset When: