AnsweredAssumed Answered

MPC5777C ADC is not accurate

Question asked by Ni Zhang on Apr 12, 2018
Latest reply on Apr 17, 2018 by Ni Zhang

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.

For example:

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.

Any suggestions?


Thanks a lot