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SRivi.1
SRivi.1
Associate II
December 8, 2020
Solved

Output Pin

  • December 8, 2020
  • 3 replies
  • 1223 views

Hi, I have a Nucleo 144 - STM32H743ZI2 and I need that the output pins deliver 5V, no 3.3V. Is it possible?

Thanks

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Best answer by DJC

The short answer is "no" right out of the box.

However, you are trying to send 5V signals (not power) to a device, you can look for a 5V tolerant pin (often marked as FT) and then use an open-drain configuration with no internal pull up or pull down. Then select an extrarenal pull up resistor that fits well inside the current rating. You need to check the electrical characteristics to see what kind of 5V currents it can sink. (typically just start with 100k... but check the docs).

The result is that the resistor provides your 5V signal as default and your chip provides the ground.

Would be really happy to hear if someone disagrees with me on this one... I plan to put this into production.

3 replies

DJC
DJCBest answer
Senior
December 8, 2020

The short answer is "no" right out of the box.

However, you are trying to send 5V signals (not power) to a device, you can look for a 5V tolerant pin (often marked as FT) and then use an open-drain configuration with no internal pull up or pull down. Then select an extrarenal pull up resistor that fits well inside the current rating. You need to check the electrical characteristics to see what kind of 5V currents it can sink. (typically just start with 100k... but check the docs).

The result is that the resistor provides your 5V signal as default and your chip provides the ground.

Would be really happy to hear if someone disagrees with me on this one... I plan to put this into production.

DJC
DJC
Senior
December 8, 2020

p.s. if you want to send power. ST has loads of power management devices that can be controller by the mcu.

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