RE: NRF52832 Power & HFCLK

Kenneth — Tue, 09 Jul 2019 11:23:11 GMT

Hi,

There is no easy answer here.

I would first recommend that you make very simple low power example, e.g. main() {while(1) __WFE();} just to verify that your measurement setup is working.

Once you start writing code and including peripherals they will claim internal resources (e.g. clocks, regulators, easydma etc) which will cause the base current to possible stay high while they are enabled. In general you should stop and disable peripherals when no longer used. So in this case you likely have one or more peripherals that are claiming resources, there is no easy way to identify which other than manually disable them until current is in the 1-2uA range when calling __WFE().

You should also check out the errata list for known issues that you should pay specific attention to:
https://infocenter.nordicsemi.com/topic/errata_nRF52832_Rev1/ERR/nRF52832/Rev1/latest/err_832_new.html?cp=3_1_1_1_1

Floating input pins may also cause increased current consumption.

This blog post may also be useful:
https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/optimizing-power-on-nrf52-designs

Best regards,
Kenneth