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许和平
许和平
Associate
April 26, 2023
Solved

Can I use STM32F429 Discovery Board 3V/5V pin as power supply?

  • April 26, 2023
  • 1 reply
  • 1475 views

I have a stm32f429 discovery board, can I use its 3V/5V pin as power supply?

Image below is from mb1705c, I'm not sure the meaning of "EXT_5V, Input only".


_legacyfs_online_stmicro_images_0693W00000bisTuQAI.pngI would appreciate it if you could answer my question.

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Best answer by Peter BENSCH

EXT_5V and EXT_3V are internal designations that lead to the network names 5V (P1.1, P1.2) and 3V (P2.1, P2.2) respectively.

Of course, you can also use them as a power supply, but then you should

  • check exactly how much current you can draw from the pins of the DISCOVERY, or
  • make sure that you stay within the voltage limits when feeding in the corresponding voltage while supplying the DISCOVERY.

Does this answer your question?

Regards

/Peter

1 reply

Peter BENSCH
Peter BENSCHBest answer
Technical Moderator
April 26, 2023

EXT_5V and EXT_3V are internal designations that lead to the network names 5V (P1.1, P1.2) and 3V (P2.1, P2.2) respectively.

Of course, you can also use them as a power supply, but then you should

  • check exactly how much current you can draw from the pins of the DISCOVERY, or
  • make sure that you stay within the voltage limits when feeding in the corresponding voltage while supplying the DISCOVERY.

Does this answer your question?

Regards

/Peter

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