Can the ADC on STM32F745 wake up the micro from Standby?

LJain.1 · ‎2021-12-14

Would like the ADC on STM32F745 to wake up the micro from Standby if a certain positive or negative threshold is reached. Is this possible?

Peter BENSCH · ‎2021-12-14

Welcome, @LJain.1, to the community!

Yes, you can set a threshold and rise an interrupt, see Analog Watchdog in RM0385.

Regards

/Peter

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LJain.1 · ‎2021-12-14

Thanks for the prompt reply, Peter.

Followup question - Will this interrupt function even when the device is in Standby? There's a table in the spec which indicates that ADC support in Standby is not available (refer to table 14 from the spec you referenced below).

Thanks,

Lakeri

Peter BENSCH · ‎2021-12-14

Oh sorry, I overlooked that you want to get off standby. No, you can only come out of standby with the specified wake-up sources, so that you would e.g. have to work with an external comparator and use the WKUP pin.

Regards

/Peter

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LJain.1 · ‎2021-12-15

ok, thats in line with my understanding of the spec as well.

Another followup question - what about using the ADC interrupt (on STM32F745) to wake up from sleep? Table 14 indicates that the support for ADCx in Sleep mode is O (Optional - Disabled by default. Can be enabled by software). Does this mean that before entering sleep mode (e.g. WFI), a software sequence needs to be followed to keep the ADC on during sleep mode? If yes, then where can I find the details of this sequence?

Much thanks,

Lakeri