Evaluation Board STM32L552E-EVAL

Hello DYann.1,

please check-out the user manual for this board available here. 3.3V Power supply outputs are available on the following position: CN5 pin 38, CN8 pin 38, or CN9 pin 38. The pins should also be marked with 3V3 label.

Please click on Select as Best if my reply fully answered your question. This will help other users with the same problem to find the solution faster!

Here's a schematic, might want to be careful about how much current you draw, and perhaps have your own supply/regulator, and use a common ground

https://www.st.com/resource/en/schematic_pack/mb1372-l552zeq-c02_schematic.pdf

Fix the search, then it might find things..

Hello,

Thank you for your helps, now I can have 3.3 V for my application.