PCF85063A RTC + JMP4

nuabraham

I’m working on a project that uses the PCF85063A-based external RTC with the nRF9160 Feather. I noticed from the schematic that the RTC interrupt line is connected to pin P0.04 (D8) via the JMP4 solder jumper.

I’d like to confirm:

Can I safely solder JMP4 to connect the RTC INT output to P0.04?

Is it supported to use P0.04 as a wake-up source from deep sleep (System OFF or PM state) triggered by the RTC alarm?

My goal is to wake the nRF9160 from deep sleep once/twice per day using the external RTC alarm interrupt.

jaredwolff

@nuabraham that’s the idea. It’s disconnected by default since it’s a shared pin and not everyone may want that functionality.

nuabraham

Thank you for the confirmation. Also, I noticed that the newer PCF85063A Zephyr driver (v2.7) has switched from using the counter API to the rtc API. For use cases like setting an alarm to wake from deep sleep, should I be using the rtc API (as in v2.7) or is it still valid to use the counter API` for similar RTC-based wake-up scenarios?

jaredwolff

My driver was implemented with the counter API before the RTC one existed. Use whichever one will work best for your application.