BQ2040SN-C408 BENCHMARQ, BQ2040SN-C408 Datasheet - Page 15

• 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

MaxError() (0x0c)
Returns the expected margin of error (%) in the state of
charge calculation.
RelativeStateOfCharge() (0x0d)
This read-only word returns the predicted remaining
battery capacity expressed as a percentage of FullChar-
geCapacity (%).
valid for battery capacities more than 1504mAh
and less than 10,400mAh.
AbsoluteStateOfCharge() (0x0e)
This read-only word returns the predicted remaining
battery capacity expressed as a percentage of DesignCa-
pacity (%). Note that AbsoluteStateOfCharge can return
values greater than 100%. Absolute StateOfCharge
is only valid for battery capacities more than
1504mAh and less than 10,400mAh.
Accuracy:
bration
Output: unsigned integer. Returns the percent un-
certainty for selected information.
Units: %
Range: 0 to 100%
Output: unsigned integer. Returns the percent of re-
maining capacity.
Units: %
Range: 0 to 100%
Granularity: 1%
Accuracy: MaxError after circuit and capacity
calibration
Output: unsigned integer. Returns the percent of
remaining capacity.
Units: %
Range: 0 to 65,535%
Granularity: 1%
Accuracy: MaxError after circuit and capacity
calibration
1% of the DesignCapacity after cali-
RelativeStateOfCharge is only
15
RemainingCapacity() (0x0f)
This read-only word returns the predicted remaining
battery capacity. The RemainingCapacity value is ex-
pressed in mAh.
FullChargeCapacity() (0x10)
This read-only word returns the predicted pack capacity
when it is fully charged. FullChargeCapacity defaults
to the value programmed in the external EEPROM until
a new pack capacity is learned. The new FCC is stored
to EEPROM within 400ms of a valid charge after a
qualified discharge.
RunTimeToEmpty() (0x11)
This read-only word returns the predicted remaining
battery life at the present rate of discharge (minutes).
The RunTimeToEmpty value is calculated based on
Current.
AverageTimeToEmpty() (0x12)
This read-only word returns the predicted remaining
battery life at the present average discharge rate (min-
utes). The AverageTimeToEmpty is calculated based on
AverageCurrent.
Output: unsigned integer. Returns the estimated re-
maining capacity in mAh.
Units: mAh
Range: 0 to 65,535mAh
Granularity: 0.2% of DesignCapacity or better
Accuracy: MaxError
pacity calibration
Output: unsigned integer. Returns the estimated full
charge capacity in mAh.
Units: mAh
Range: 0 to 65,535mAh
Granularity: 0.2% of DesignCapacity or better
Accuracy: MaxError
pacity calibration
Output: unsigned integer. Returns the minutes of
operation left.
Units: minutes
Range: 0 to 65,534min
Granularity: 2min or better
Invalid data indication: 65,535 indicates battery is
not being discharged.
FCC after circuit and ca-
FCC after circuit and ca-
bq2040