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

[许和平]

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".

I would appreciate it if you could answer my question.

[Peter BENSCH · Accepted solution]

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