RE: Use ADC to wakeup on analog input over threshold

MattFL — Mon, 05 Mar 2018 15:04:44 GMT

Thank you very much!

RE: Use ADC to wakeup on analog input over threshold

Håkon Alseth — Mon, 05 Mar 2018 09:21:05 GMT

Hi,

[quote user=""]Am I on the right track with an nrf51 and expecting to be able to configure LPCOMP to wake the processor when an analog input exceeds a preset value, then starting processing analog input triggered interrupts as quickly as 0.1 sec after the signal that wakes it up? [/quote]

Yes, that is correct. You can set the LPCOMP to generate interrupt based on either an external reference, or scaling of VDD (from 1/8*VDD to 7/8*VDD), and you can generate an event on rising, falling, or both.

100 ms is long enough to start processing. The 16M RC oscillator starts up in the matter of ~10 microseconds, and if you need more precise clock, you can start up the external 16M crystal (~1.5 ms).

Cheers,

Håkon