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CJaid.1
CJaid.1
Associate
March 22, 2023
Question

How can i output 5V from the STM32303E-EVAL board. By default it can only output 3.3V.

  • March 22, 2023
  • 2 replies
  • 1198 views

For my project, i need to power a relay that works on 5V. But the outpout available to me from the board is only 3.3V and due to which it is not enough to power on the relay.

There is a D5V pin on the CN6 connectors, but it does not give out 5V.

do i need to change some jumper settings ? or do i need to write that pin high to enable 5V ?

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2 replies

Tesla DeLorean
Tesla DeLorean
Guru
March 22, 2023

Probably doesn't source enough current on the GPIO either to energize a relay.

​

Use the 3V3 to drive a darlington transistor or FET that switches 5V across the relay coil.

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Peter BENSCH
Peter BENSCH
ST Technical Moderator
March 22, 2023

D5V is not an output, but one of the four inputs from which +5V is derived with JP14, as you can also find in UM1807.

+5V is then available on two connectors: CN4.25 and CN2.25.

The 2x17 pin CN2 is located between the two round and golden touch surfaces and the narrow side of the board.

CN4 is a similar socket right next to it.

Hope that helps?

Regards

/Peter

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