Apply known voltage
Voltage() = known voltage
End
int vOffset = Voltage()
– avgRawVoltage
Write vOffset to DF
Obtain avgRawVoltage
Voltage Calibration
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SLUUBH1C–August 2016–Revised March 2018
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Factory Calibration
3.4 Voltage Calibration
A known voltage must be applied to the device for voltage calibration, but the voltage can be measured in
two different ways. See Voltage for more details.
The bq35100 device is default-configured to use the BAT input for voltage measurement, and the data
used for calibration is made available through the calibration commands in units of millivolts (mV). In this
setup, the calculated voltage offset must be written to the corresponding location in DF. The voltage offset
is represented by an integer that is a single byte in size and can be written to the appropriate location in
DF without any intermediate steps. The host system must ensure that the fuel gauge is UNSEALED.
The device has the option to use an external voltage divider circuit where the voltage is measured through
the VIN pin, and the data used for calibration is made available through the calibration commands. In this
setup, there is no user offset required and the reported RawVoltage is actually RawADCounts. The gain
of the voltage translation circuit needs to be calculated and stored, where: V
cellGain
= (V
cal
/RawADCounts) ×
65536. This resulting integer is written to VIN
Gain
.
NOTE: The step labeled Obtain avgRawVoltage refers to Section 3.7, Obtain Raw Calibration
Data.
Figure 3-2. Voltage Calibration Flow
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