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UB40
Associate
May 6, 2025
Solved

STM32F769 VDDUSB

  • May 6, 2025
  • 2 replies
  • 338 views

Hello,
I'm using in my projects with ports PA10,PA11 (for Logs - uart), and PB14 and PB15 as normal GPIO.
They didn't works.

After long troubleshooting.... I found out that is because these ports are supply separately by the VDDUSB pin which was disconnected.

I couldn't find the reason in the datasheet, I'll be happy to understand the construction and the reason. 

 

Best answer by AScha.3

Hi,

reason...ask chip designer, why separate VddUSB ...maybe, to be more flexible, if chip runs on 1,8V, the USB related pins still have to work on 3v3 ; so can supply separate, if needed;

and see ds :  General operating conditions

AScha3_0-1746521704785.png

 

2 replies

AScha.3
AScha.3Answer
Super User
May 6, 2025

Hi,

reason...ask chip designer, why separate VddUSB ...maybe, to be more flexible, if chip runs on 1,8V, the USB related pins still have to work on 3v3 ; so can supply separate, if needed;

and see ds :  General operating conditions

AScha3_0-1746521704785.png

 

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    U
    UB40Author
    Associate
    May 6, 2025

    thank you

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