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STM32F769 VDDUSB

UB40
Visitor

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. 

 

1 REPLY 1
AScha.3
Chief III

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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