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BQ34110: Current scaling for higher resolution

Part Number: BQ34110


Hi,

I'm wondering about the registers that I need to change to use current scaling.

Our device has a battery of 1200 mAh, which charges at 1C and discharges at max 50mA (mostly 10mA). Since this is well below the maximum value of the gauge, we plan to use current scaling by 16 to fully benefit from the whole range. The Rsense has a value of 62 mOhm, which gives an ADC LSB of 123uA (assuming 14 bits for the ADC).

For scaling during the calibration, it's pretty clear that, for the computation of ccGain, instead of "current", I should use "current * 16" (ccGain = (current*16) /(avgRawCurrent-(ccOffset + boardOffset) / 16)), which will result in proportionals ccGain and ccDelta. However, I'm wondering if I also need to scale every other parameter in the dataflash that the unit is mA or mAh (e.g. CC offset, board offset, deadband, charge currents, etc.)?

Thank you,

Fred