BQ2040SN-C408 BENCHMARQ, BQ2040SN-C408 Datasheet - Page 14

• 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

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AtRateTimeToFull() (0x05)
This read-only word returns the predicted remaining
time to fully charge the battery at the AtRate value
(mA) and is valid only if read immediately after an
AtRate command.
AtRateTimeToEmpty() (0x06)
This read-only word returns the predicted remaining op-
erating time if the battery is discharged at the AtRate
value and is valid only if read immediately after an
AtRate command.
AtRateOK() (0x07)
This read-only word returns a Boolean value that indi-
cates whether or not the EDVF flag has been set.
When the AtRate value is positive, the
AtRateTimeToFull function returns the predicted
time to full-charge at the AtRate value of charge.
When the AtRate value is negative, the
AtRateTimeToEmpty function returns the predicted
operating time at the AtRate value of discharge.
Input/Output: signed integer. AtRate is positive
for charge and negative for discharge.
Units: mA
Range: -32,768mA to 32,767mA
Output: unsigned integer. Returns the predicted
time to full charge.
Units: minutes
Range: 0 to 65,534min
Granularity: 2 min or better
Invalid Data Indication: 65,535 indicates that the
AtRate value is negative.
Output: unsigned integer. Returns the predicted
time to empty.
Units: minutes
Range: 0 to 65,534min
Granularity: 2min or better
Invalid Data Indication: 65,535 indicates that the
AtRate value is not negative.
Boolean: Indicates if the battery can supply addi-
tional energy.
Units: Boolean
Range: TRUE 0, FALSE = 0
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Temperature() (0x08)
This read-only word returns the cell-pack's internal
temperature.
Voltage() (0x09)
This read-only word returns the cell-pack voltage (mV).
Current() (0x0a)
This read-only word returns the current through the
battery's terminals (mA).
AverageCurrent() (0x0b)
This read-only word returns a rolling average of the cur-
rent through the battery's terminals. The AverageCur-
rent function returns meaningful values after the bat-
tery's first minute of operation.
Output: unsigned integer. Returns the cell tem-
perature in tenths of degrees Kelvin increments.
Units: 0.1°K
Range: 0 to +500.0°K
Granularity: 0.5°K or better
Accuracy:
Output: unsigned integer. Returns the battery ter-
minal voltage in mV.
Units: mV
Range: 0 to 65,535mV
Granularity: 0.2% of DesignVoltage
Accuracy: 1% of DesignVoltage after calibration
Output: signed integer. Returns the charge/dis-
charge rate in mA, where positive is for charge
and negative is for discharge
Units: mA
Range: 0 to 32,767mA for charge or 0 to
–32,768mA for discharge
Granularity: 0.2% of the DesignCapacity or better
Accuracy: 1% of the DesignCapacity after calibration
Output: signed integer. Returns the charge/dis-
charge rate in mA, where positive is for charge
and negative is for discharge
Units: mA
Range: 0 to 32,767mA for charge or 0 to
–32,768mA for discharge
Granularity: 0.2% of the DesignCapacity or better
3°K after calibration