Issues with BLE at higher temperatures

RE: Issues with BLE at higher temperatures

hmolesworth — Tue, 24 May 2022 17:43:18 GMT

I would argue same die, thicker case so less affect but not zero; dark leakage is also very temperature sensitive. Metallic module case might be closer to zero.

RE: Issues with BLE at higher temperatures

ketiljo — Tue, 24 May 2022 07:24:09 GMT

That only applies to the CSP, the QFN is not affected by light.

RE: Issues with BLE at higher temperatures

Jeffrey Haynes — Mon, 23 May 2022 22:00:05 GMT

Thanks, I'm actually tracking a possibly-related issue that has nothing to do with temp. Let me chase that down and then I'll get back to you before we waste any more time with this. Thanks.

RE: Issues with BLE at higher temperatures

hmolesworth — Mon, 23 May 2022 15:19:25 GMT

Long shot: You might try covering the nRF52840 with an optical shield to guarantee none of the bright light permeates through the die cover or through the pca material to the underside of the die as the die is light-sensitive (similar to most semiconductor dies). Easy to check, hopefully.

RE: Issues with BLE at higher temperatures

ketiljo — Mon, 23 May 2022 10:12:37 GMT

Issues like this can often the causes by the frequency of the crystal. The radio itself will operate fine up to 85 degrees but it's dependent on a accurate enough clock source. What's the spec of the 32 MHz crystal and the value of the cyrtsl load caps?