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S32K146: Some ADC channels not working

Question asked by David Siguenza-Tortosa on Nov 26, 2019
Latest reply on Nov 28, 2019 by David Siguenza-Tortosa

Hello,

We are currently debugging a custom PCB with the S32K146 (144 LQFP). We must monitor a large number of analog inputs. So far we have been using software triggering of the conversion. Channels 14, 22 and 23 of ADC0 do not read their input voltages: they output values near 0. The rest of the channels read correctly their input voltages (except 12 and 13 of ADC0 which behave "funny", but in a different way).

According to the Reference Manual, package 144 LQFP of S32K146 has 24 channels per ADC module, so there is no limit here. We have also checked the PORT and ADC configuration several times, and it looks OK. We have measured input voltages at the processor pins, and they are correct. The board itself in general seems to work fine.

What are we missing?

Thanks in advance for any suggestion you may make.

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