Drop in Measured CSENSE Values During USB Enumeration

RE: Drop in Measured CSENSE Values During USB Enumeration

Jared — Wed, 27 Jul 2022 08:39:01 GMT

Hi there,

Are you using the comparator or the SAADC for the cap sense, and Is there any difference in variation if you switch? Could you share a minimal example that would reproduce it on a development kit?

Also, note that the cap sense library was made to show use cases for the SAADC and the COMP peripherals. Although not clearly stated in the product specification, the capacitive sense library is not production ready since it hasn't been tested well. In many cases it would be better to use a dedicated capacitive sensor.

regards

Jared

RE: Drop in Measured CSENSE Values During USB Enumeration

Denver Hoggatt — Tue, 26 Jul 2022 21:39:56 GMT

Apologies for the late reply,

Yes we are using a custom board. And yes, I can duplicate it to some extent on a development kit.

SDK version 16.0.0 on an nrf52840.

I did notice a slight mistake in my original phrasing. The values measured are slightly increasing after USB enumeration, not dropping.

RE: Drop in Measured CSENSE Values During USB Enumeration

Jared — Tue, 19 Jul 2022 09:15:10 GMT

Hi there,

Are you using a custom board? Have you been able to reproduce it on a development kit?

What SDK version are you using?

regards

Jared