3V3 External Power Supply + USB_STLK for debugging on NUCLEO-WL55JC1

[lame_stmr]

Hello,

Is it possible to power this board with an external 3.3 volt supply while still having the st-link active for debugging purposes? If not, how else can I debug my firmware? I've looked through the UM2592 for the dev board, but can't seem to nail down my answer. Any advice is appreciated. Thank you.

[lame_stmr]

Okay, I got the board in my hands and was able to test my configuration. I seem to have successfully separated the MCU power and the 3V3 STK so I can use both independently. However, I did see some irregular spikes in my current measurements of the system - i have attached an image of the behavior. What could be the reason for this? I haven't noticed this when just using a normal single power configuration. Could it be the SMPS in some sort of skipping mode? How can I deactivate this? Please let me know. Thanks again for the guidance!

[TDK]

When your question is answered, please select the post that answered it as the solution. This is typically not your own post, unless you answered it yourself.

If your original question in the opening post has been answered, please create a new thread with relevant details.

[lame_stmr]

Hello, I chose my reply as an answer as that was the configuration that worked. I hope this poses no issue.

[Andrew Neil]

No, you didn't: the post you've marked asks a question - it's not an answer!

How to change the marked solution.

[lame_stmr]

okay, i have changed. apologies!