Samsung A series not detecting nRF52832

RE: Samsung A series not detecting nRF52832

Carl Richard — Wed, 23 Sep 2020 06:54:39 GMT

Hi, Loliplol!

Great that you solved the issue, but I agree that this was an interesting behavior! My guess is that the other phones have more tolerance for timing variations that arise with wrong capacitor values.

Best regards,
Carl Richard

RE: Samsung A series not detecting nRF52832

loliplol — Mon, 21 Sep 2020 17:02:10 GMT

Hi Carl,

We have found a bug in the PCB design.

I have to admit, this is a really interesting behaviour from Samsung A devices.

What we discovered:

- Cload capacitors on the 32MHz oscillator (supposed to be 18pF, originally it was 12pF)

When we discovered this mistake, we replaced the capacitors with a suitable value and all of a sudden all our devices showed up on Samsung A series devices.

Keep in mind, S7 S8 S9 S10 phones could see the module even before the change and keep to see it after the change. A series does not see it with old capacitors.

RE: Samsung A series not detecting nRF52832

Carl Richard — Mon, 21 Sep 2020 07:39:30 GMT

Hello, Loliplol!

The issue you describe have been commonplace for Samsung A series devices. Could you try the approach described in this thread?

Best regards,
Carl Richard