g431kb low output voltage

[dfiallo]

Hello,

Newbie here got nucleo-g431kb and I was trying to power a sensor from either CN3 pin 4 at 5V or CN3 pin 14 at 3.3V, but neither pin outputs the correct voltage. Pin 14 outputs ~300mV and pin 4 outputs ~450mV. This is also with no external load, I'm simply probing the pin to check the voltage. I'm powering the board through CN1 and ran succesfully printing "Welcome to STM32 world !", LD4 is green, and SB15 is on. I'm assuming that either pin would output the voltages without needing to program the board, is this assumption correct? Anything else that I should check for? Thank you in advance for your help.

[TDK · Accepted solution]

3V3 and VDD are tied together. If the chip is powered (VDD) then you should see a voltage on 3V3 (CN3 pin 14).

https://www.st.com/resource/en/schematic_pack/mb1430-g431kbt6-a02_schematic_internal.pdf

[dfiallo]

The issue was my probe set to 10x. Thanks for the promptly reply though!