In this chip, we have four ADC engines, I calibrated all four ADC engines by reading and calculating OCC and Gcc registers.
However, when I test it, only EQADCA unit 0 is accurate, all other three unit is not accurate.
I feed 5V to both EQADCA 0 and eQADCA1, the channel in unit 0 shows 4.95v, however, the channel in unit 1 shows me only 3.98v after scaling.
I did exactly the same configuration to all the ADC units.
Thanks a lot