ADC calibration failure

[Sourdev]

Hi,

I am using S32K311 series MCU and facing ADC calibration failure every time. TEST_FAIL bit is setting.

 I have followed below sequence for ADC calibration

Sourdev_0-1749582861814.png

what could be the reason behind calibration failure and how to solve this issue ? 

[PetrS]

Hi,

instability of the board source can cause failures when running the ADC calibration. One way to mitigate this is to run the calibration multiple times, e.g. as it is done in RTD demo examples.
Also be sure reserved bits in CALBISTREG are not modified. Writing to this field can cause ADC to
operate unreliably.

BR, Petr

[Sourdev]

Hi,

I calibrated 5 times but each time TEST_FAIL bit is set and reserved bits in CALBISTREG are not modified still facing issue. 

[PetrS]

Hi,

you can try to perform ADC selftest as well to check the ADC.
If you have issue still share the simplified project you use. Specify the HW used as well.

BR, Petr