What mode can I put my mcu in to consume the least amount of power but still have the ability to "wake up" after an event has been triggered?

[LConn.2]

I have a stm32 mcu. I want to put it in a very low power mode until an event triggers it to wake up. What mode can give me the lowest power consumption? whilst still being able to accept an event to wake up? and what sort of power would that draw?

[Sarra.S]

Hello @LConn.2​  and welcome to ST Community,

First, you need to specify which product are you working with..

[LConn.2]

Hi @Sarra.S​ ,

I am using a stm32wb15cc board

[S.Ma]

One first step would be to run the core at a lower frequency (like a gear box).

Wait for interrupt is IMHO neglectable scheme

Stop oscillator mode, when possible, is another stronger way to reduce power, as long as the application can restart on time from a suitable wake up signal source.

[Remy ISSALYS]

Hello,

You can use the shutdown low power mode and use a wakeup pin or RTC to exit from this mode.

Best Regards