RE: How to do multichannel adc in low power consumption

Jonas Hoefer — Mon, 04 May 2026 13:47:23 GMT

[quote userid="7377" url="~/f/nordic-q-a/93700/how-to-do-multichannel-adc-in-low-power-consumption/394916"]In some cases, the SAADC enter a bad state[/quote]

How would that bad state affect the system? Could this lead to fail the nRF52832 to enter sleep mode correctly?

Still searching for causes for my problem: nRF52832 won't wakeup after shutdown (nrf_gpio_cfg_sense_set & NRF_LPCOMP)

Is there any way to force this bad state to occur?

RE: How to do multichannel adc in low power consumption

Einar Thorsrud — Wed, 09 Nov 2022 13:07:35 GMT

Hi,

[quote user=""]It seems to be using workaround from Errata 212 to cut the current consumption, but I didn't quite understand it. Could anyone help to explain it?[/quote]

In some cases, the SAADC enter a bad state. This workaround recovers by making a copy of some undocumented internal registers (including those that hold the offset calibration), and resetting the SAADC peripheral (disable and re-enable) by writing to an undocumented internal register, before writing back the data that was there before the reset.

[quote user=""]And is there other ways to do the same thing?[/quote]

The first example you refer to use the V2 API of the nrfx_saadc driver, and this is significantly improved and handles things like errata 212. So I recommend you use this. With that, as long as you stop the SAADC when not in use, you should get a low sleep current.