2025-10-03 4:53 AM
Hi everyone,
I am working on an STM32H523 MCU and I have recently observed some strange behavior regarding the PB14 and PC9 pins. I have the following setup:
When the PC9 pin is unset, the PB14 is 3.3V, as expected. But when setting the PC9 pin, the voltage on PB14 drops to only 1.13V. These pins are otherwise not connected, so 2 seemingly unrelated pins seem to have some dependency within the stm32h523 chip.
Solved! Go to Solution.
2025-10-05 4:18 AM
Dear @rbnt ,
Here you go with the FAQ
these pins have additional function of UCPD1 and should be handled in a way to not affect your application .
Hope it helps you ,
STOne-32
2025-10-05 4:18 AM
Dear @rbnt ,
Here you go with the FAQ
these pins have additional function of UCPD1 and should be handled in a way to not affect your application .
Hope it helps you ,
STOne-32