calibration / offset min & max values

[richardor-cell]

Hi,
how do you compute or set CURRENT_OFFSET_MIN & MAX ?

[sharma-binod]

The CURRENT_OFFSET_MIN and CURRENT_OFFSET_MAX value has been determined using ( 2048 -/+ (12.5% of 2048) ).

Brief Description:
In the current measurement circuit, there is an offset of 1.65 volts which is needed to measure negative current with ADC. This offset translates to 2048 counts in ADC configured for 12 bit resolution. But due to board non-linearities, opamp drifts etc, we have need some tolerance. We have assigned a tolerance of about 12.5 %, and hence the maximum and minimum values are calculated as above. It should be noted that the tolerance value 12.5% is not fixed, and can be made stricter or more relaxed based on requirements.