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Hi all, i am using a STM32 Nucleo-144 developement board with the STM32F429ZI MCU and i am powering it with a 5V Battery. In the Datasheet it says that Pin7 is a 3.3V output. Can i use this Pin to power a Sensor?

SMint.2
Associate II

‎2021-06-01 09:13 AM

I am referring to this datasheet (page 52) : https://www.st.com/resource/en/user...ucleo144-boards-mb1137-stmicroelectronics.pdf

0693W00000BZokSQAT.png

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4 REPLIES 4
Javier1
Principal

‎2021-06-01 09:21 AM

That pin seems like the one connected to the NUCLEO board 3v3 regulator´s output.

How much current requires your sensor?

The nucleo regulator seems to be LD39050PU33R with a max current output of 500ma

we dont need to firmware by ourselves, lets talk
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SMint.2
Associate II

‎2021-06-01 09:45 AM

According to the datasheet it needs 30 mA

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Javier1
Principal
In response to SMint.2

‎2021-06-01 10:04 AM

Go for it

0693W00000BZp2lQAD.png

we dont need to firmware by ourselves, lets talk
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SMint.2
Associate II

‎2021-06-01 10:28 AM

Cheers for the quick response and the meme :face_with_tears_of_joy:

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