Using ADC with Sleep Mode

[ishgum]

I'm relatively new to development on the nRF52832 and I'm trying to find information on how to use the sleep mode with the SAADC.

Goal: The micro should be in sleep mode until an event is triggered - this event can range from a few millivolts to the full scale of the ADC (zero otherwise). Once the event is triggered the micro wakes up, samples the ADC until the event finishes (~10s) and then goes back to sleep.

Things I would like to know:

1. How to set up the nRF52832 to interrupt on the rising edge of an ADC value (or just a threshold level if that is not possible), but still be able to use it as an ADC?

2. How long does the nRF52832 take to wake from "sleep"?

Thanks for your help!

[Jørgen Holmefjord]

Hi,

1. You can use the LPCOMP peripheral to wake the chip from both system on and system off sleep mode. There is a LPCOMP example in the SDK.
2. The wakeup time depends on the sleep mode you are in. Please have a look at the electrical specifications for the power peripheral in the documentation. This answer also contain usefull information about the wakeup time.

Best regards,

Jørgen