stm32F407ZET6 GPIOC Pin13 high = 1.5v

[Pedram]

Posted on December 23, 2017 at 12:15

Hello,

i set GPIOC Pin13 high but high voltage is 1.5v How can I fix this problem?

STM32F407ZET6 

VCC = 3.3v

[Tesla DeLorean]

Posted on December 23, 2017 at 13:16

What are you driving with the pin? Is something conflicting with that?

Seem to recall it being in low power domain, so limited current compared to other pins.

[Pedram]

Posted on December 23, 2017 at 22:49

I driving LE pin of Latch (74HC573)

I found the problem 

After how many times to program Micro , Pin 13 go floats 

To fix this, need to remove the RTC battery and reinstall it

I tested 100 times, there is no connection between the Vbat pin and the GPIOC 13

Why does this problem occur?

[Tesla DeLorean]

Posted on December 23, 2017 at 23:53

PC13 is in the low power domain, will be powered by battery in absence of VDD.

Review Reference Manual (RM0090) search on 'PC13', several references in there, and discussion of AF vs GPIO settings, and resetting RTC/PWR domains.