It is found that the consistency of each power-on is not good NRF52832

RE: It is found that the consistency of each power-on is not good NRF52832

mathiaso — Wed, 26 Jun 2024 09:39:28 GMT

Ok. Do you see this on several devices or only one device?

When performing the offset calibration, it might be that you end up on the border between two different steps if you see two different levels after power-on.

It could be an idea to test oversampling. If enabling oversampling on channel 0 before offset calibration, the calibration will run with oversampling. This takes a bit more time but will average out noise.

RE: It is found that the consistency of each power-on is not good NRF52832

Francis Feng — Tue, 25 Jun 2024 03:06:24 GMT

There was no change in temperature and it was calibrated. We did another experiment and collected an additional 2.48V benchmark. It is found that the power-on consistency of the two benchmarks is not good. Please help to analyze the reason.

RE: It is found that the consistency of each power-on is not good NRF52832

mathiaso — Mon, 24 Jun 2024 14:52:29 GMT

Hi, Francis.

Have you tried running the calibration at start-up?

"The ADC has a temperature-dependent offset. If the ADC is to operate over a large temperature range, we recommend running CALIBRATEOFFSET at regular intervals, a CALIBRATEDONE event will be fired when the calibration is complete."

Best regards,
Mathias