STM32H743 5V tolerant pins for an LQFP176 Package

[Lagodolio]

Hello, I have a doubt about the voltage tolerance of STM32H743: looking at Stm32h743bi.pdf, LQFP176 pins are numbered 1,2,...,176, while CubeIDE gives me PA1, PA2, PB1, PB2.... etc.

So, how can know if my UART3 pins (PB10 & PB11, Alternate function Push-Pull, No Pull Up - No Pull-Down, Maximum Output Speed Low) are 5V tolerant, to connect my RS232 to RS485 converter?

Thanks and best regards

[Tesla DeLorean · Accepted solution]

Try the Datasheet

Typically you'd use a 3.3V CMOS MAX3232 to get RS232 compatible levels.

[Lagodolio]

Hello Tesla DeLorean and thanks for your reply. I didn't notice the "Pin Name (function after reset)" :o column, so I wasn't sure it was 5v tolerant.

In that case, my pins should be 5V tolerant.

I have to connect my stm32 to an RS232 -> RS485 industrial converter. I measure 5V from the TX output of the adapter, but I need only to use the RX line of the converter (linked to the TX line from the micro). Can I damage my STM32? They suggest that the converter should accept also 3.3V signals, but my first problem is to not break the H7.