Nucleo-32 L432KC doesn't work when powered by 3v3

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avilevin2003
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Joined: Sat Jun 03, 2023 9:07 am

Nucleo-32 L432KC doesn't work when powered by 3v3

Post by avilevin2003 »

I'm trying to run a basic blinking project from Arduino over my STM32 Nucleo-32 L432KC board, and it seems like the code only runs when powered by USB or by batteries that are connected to the VIN pin, but when it's powered by batteries that are connected to the 5V or 3V3 pin, the LED2 is on, but the LED3 is not blinking as if the code doesn't run as expected.

Any idea what could be the reason and how to resolve it?

Thanks!
GonzoG
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Re: Nucleo-32 L432KC doesn't work when powered by 3v3

Post by GonzoG »

avilevin2003
Posts: 2
Joined: Sat Jun 03, 2023 9:07 am

Re: Nucleo-32 L432KC doesn't work when powered by 3v3

Post by avilevin2003 »

Yes, the power supply section.
Except from the fact that I can't be sure if SB1 is on or off (not too familiar with electronics in general and STM32 in particular), it seems like it's not bridged though, so I think it's off. all the rest of the instructions are done as mentioned in this doc.
Still - when connected from 5v or 3v3 - the LD2 light turned on, but nothing actually works.
GonzoG
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Joined: Wed Jan 15, 2020 11:30 am
Answers: 26
Location: Prudnik, Poland

Re: Nucleo-32 L432KC doesn't work when powered by 3v3

Post by GonzoG »

5V pin, USB 5V, ST-Link 5V all are connected to one point. If it runs powered from USB, it has to run powered from 5V pin.
BUT your 5V supply needs to be 5V +/- 0,25, not 4.5, nor 5.5V

If you did what manual says, LD2 cannot lit up when powered with 3.3V pin. SB14 needs to be OFF (removed / not bridged).
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