Hello,
I am working on a project to design an IO and motion controller board using STM32H755 mcu. Could you please review the attached basic schematic design for the mcu to avoid any design related issues that may arise later.
+3.3V power is coming from a switching regulator.
Is it necessary to put small value resistors at the TX and RX of UART pins (H3)?
Thank you.
Looks good to me.
You do not need resistance on TX/RX pins at typical speeds. It can help to put a resistor at the RX pin to terminate it if the line is very long and the speeds are very high but it's not necessary in the vast majority of cases. Use the internal pullup on RX when initializing to avoid spurious errors when the line is disconnected.
Consider using the 16-pin connector with UART on it rather than the 10-pin one. It's useful to have and supported out of the box by recent debuggers such as STLINK-V3MINIE.
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