GPIO pin max current input (sink)

[yonggeon]

I want to use led with following connection and i remember that I've seen this application somewhere on the Internet:

3V3 - LED - RESISTOR - STM32 PIN

I've seen the max total current output of MCU then is there any max total input current of MCU?

[Andrew Neil · Accepted solution]

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@yonggeon wrote:

 I've seen this application somewhere on the Internet:

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LoL - that is the standard way to use an LED with any microcontroller!

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@yonggeon wrote:

is there any max total input current of MCU?

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Yes, these figures will be in the Datasheet for the chip - the Electrical Specifications section.

[yonggeon]

does "injected current" mean input current?

[Andrew Neil]

I don't think so - context needed.

You are looking for the GPIO pin current sink capacity.

What chip are you using?

[yonggeon]

I currently use STM32H750VBT6

[yonggeon]

I think I found the answer... maximum is 8mA w constant Voh and Vol and maximum 20mA with relaxed Voh and Vol...

[Andrew Neil]

That's for one pin.

If you've got lots of LEDs, beware that there's also a maximum total for the whole chip ...

[yonggeon]

Thank you so much!