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STM32F030 PC13,14,15 current sink limits?

Andrew Neil
Evangelist III

‎2024-09-05 10:24 AM

AndrewNeil_0-1725556635883.png

 

Is it OK to use these pins as current sinks for driving LEDs ?

 

AndrewNeil_1-1725557015423.png

 

3 REPLIES 3
STTwo-32
ST Employee

‎2024-09-05 10:37 AM - edited ‎2024-09-05 10:39 AM

Hello @Andrew Neil 

As it is mentionned on the 3rd line of the note on the screenshot:

"These GPIOs must not be used as current sources (e.g. to drive an LED)." For Curent sink, i will check this and get back to you ASAP.

Best Regards.

STTwo-32 

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Tesla DeLorean
Guru

‎2024-09-05 10:47 AM - edited ‎2024-09-05 10:52 AM

Good question, the P/N gates probably the same size, but the ground ring is probably more robust, and not gated like VDD/VBAT path

I'd tend toward it being Ok, but will watch for the official response.

Slack pins for LEDs, the PA13/PA14 often can be used and still facilitate debug connectivity if the code is aware.

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Andrew Neil
Evangelist III
In response to Tesla DeLorean

‎2024-09-05 10:57 AM

plus the reason stated for the limitation is that these pins are fed  "through the power switch", and that's what limits their sourcing capabilities.

I presume this is "the power switch":

AndrewNeil_0-1725559013974.png

 

On that basis, if it's the whole story, sinking should be OK ... ?

 

"the switch only sinks (sic?) a limited amount of current" sounds like a typo, though?

 

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