32KHZ output in low power mode

adrian4 · ‎2008-03-21

Posted on March 21, 2008 at 17:02

adrian4 · ‎2011-05-17

Posted on May 17, 2011 at 12:27

Hi,

I have a very low power application where for most of the time I need to have the STM32 running the 32.768KHZ crystal oscillator and the RTC in standby mode. It just needs to wake up once a second to do some quick stuff and then go back to sleep again.

I also need to have a continuous 32KHZ TTL level signal for something else (High impedance load) and I noticed that in AN2692 section 4.4 it says:

''For measurement purposes, the 32.768 kHZ RTC clock can be output on the TAMPER pin.''

Can it do this in standby mode, and if so will it take any more current than specified for standby mode?