Posted on January 31, 2013 at 16:34Hi everyone
I hope someone could confirm this:
I am designing a project with STM32F407vg that must operate from battery for about 2 years in STANDBY MODE,
In my system i have 2 batteries , external 12v that is regulated to 3.3v VDD ( using regulator ) for mcu but this regulator is turned off while the MCU in standby mode to save energy (there are other ICs to switch them off), and I have 3.6V battery ( about 600mA) on the PCB .
The datasheet declares that the stanbymode current for the mcu is about 4uA if RTC is ON, so
600mAh will keep the mcu in stanby mode for about 17 years (2 years is enough) !! that is ok .. is that right?
Now I have problem in the connections so please confirm if that right or not.
The output of the regulator is feeded to the VDD of the mcu and the 3.6battery is feeded by an diod to vdd to the mcu , is that ok?
when a wake up ocurres by PA0 rising edge or RTC alarm output the MCU will turn to the normal mode and enable the external regulator to operate from the external 12v battery ..Is my configuration ok?
should I connect the VBAT pin of the mcu to vdd or to the 3.6 battery ( before diod or after diod)?
Thank you in advanced
Regards
Esat
