Compatibility of STLINK-V3MODS SWD Pins with 3.3V MCU Logic Levels

[Shreayas_Acharaya]

Hello ST Community,

I have a question regarding the compatibility of the STLINK-V3MODS SWD pins with my MCU's SWD pins, which operate at 3.3V. Do I need to use logic level shifters between them, or are the STLINK-V3MODS SWD data signals fully compatible with 3.3V logic levels? Additionally, can I connect them without using logic shifters, and if so, would that be safe for stable operation?

Thank you for your assistance!

 

[Andrew Neil · Accepted solution]

The answer is here:

Your 3.3V falls between 3.0V and 3.6V - so that's fine!

See also:

https://www.st.com/resource/en/user_manual/um2502-stlinkv3mods-and-stlinkv3mini-debuggerprogrammer-tiny-probes-for-stm32-microcontrollers-stmicroelectronics.pdf#page=10

And:

via: https://www.st.com/en/development-tools/stlink-v3mods.html#documentation