question about VDD pin

[DAR20_01]

I'm a beginner and I don't understand the datasheet very well. Can I externally power my STM32 F446RE from the VDD pin (the one opposite E5V in the pinout)?
Sorry for the banality, but I only found info for generic GPIOs.
Dar

[Andrew Neil]

Welcome to the forum.

Please see How to write your question to maximize your chances to find a solution for best results.

What board are you referring to?

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[DAR20_01]

Ciao amico.
Mi dispiace. La scheda è la STM32 Nucleo F446RE 
"https://www.st.com/en/evaluation-tools/nucleo-f446re.html" 

[TDK]

Download the user manual for the board--it goes into the various power options.

In general, yes, you can apply VDD directly, but ensure you're not backpowering something. The schematic can be downloaded from the board product page. Generally, VDD is powered from the board so providing external power may not do what you want.

[DAR20_01]

Hi my friend,
You're right, I read the datasheet. I can power it from E5V and Vin. My problem is that I've already connected the Murata 24/5 Output to the VDD pin via a PCB track. This avoids damaging the board by powering it externally.
During the design phase, due to the file transfer, we missed this aspect.
Anyway, thanks guys for the quick replies!

[DAR20_01]

So am I doing any harm by powering with 5V into the Vdd? I've already made the connections (on the PCB) I just want to avoid breaking the board now

[TDK · Accepted solution]

Putting 5V on VDD will kill the chip.