Issue in very low temperature (-60/-70°C) on NRF52832

RE: Issue in very low temperature (-60/-70°C) on NRF52832

ketiljo — Wed, 28 Sep 2022 12:24:51 GMT

The 32 MHz crystal is directly responsible for the frequency of the carrier. Too much offset here and you will have increased packet loss.

I'm afraid you're on your own with this kind of test.

RE: Issue in very low temperature (-60/-70°C) on NRF52832

RomainP — Wed, 28 Sep 2022 09:15:54 GMT

Yes I know it's far away from the spec, but it's an interesting challenge ^^.

For the cristlal I don't think so because the connection mode is OK, so the timing are good to keep connection.

Do you have an idea for the RAM retentions ?

RE: Issue in very low temperature (-60/-70°C) on NRF52832

ketiljo — Wed, 28 Sep 2022 08:33:24 GMT

I wonder why you are testing this with such an insanely low temperature?!? Note that you're well below the spec of -40 degrees C here. So anything can happen as this hasn't been tested or qualified at these temps.

https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/recommended_op_conditions.html#concept_vng_xls_2q

The biggest problem will be the crystal frequency being too off I think.