RE: SAADC causing excessive power consumption

Ted Jones — Mon, 14 Jun 2021 11:48:42 GMT

Thanks Kenneth, good information and I appreciate the quick response!

RE: SAADC causing excessive power consumption

Kenneth — Mon, 14 Jun 2021 11:35:43 GMT

[quote user=""]My concern is the softdevice. I have heard anecdotal stories that the softdevice can delay other processing by far longer than the 4 ms we have to begin sampling.[/quote]

I think some of these threads may be old ones, for the nRF52840 (and S140 softdevice) you can find some timing parameters here:
https://infocenter.nordicsemi.com/topic/sds_s140/SDS/s1xx/ble_processor_avail_interrupt_latency/ble_peripheral_connection_performance.html

The only thing that can cause a longer delay would be if you execute a flash erase or write command, especially a flash page erase command can take up to 100ms. Though this is not something that happens sporadic, this is typically something the application will have control over (e.g. during bonding).

[quote user=""]Is there a way to leave the ADC disabled and to guarantee that it is re-enabled within this 4 ms window?[/quote]

I recommend to uninit() and init() between use to save current.

Kenneth