STM32U575CIT6Q and VDDUSB

[Terry Greeniaus]

Hi,

I am looking to use the STM32U575CIT6Q in a USB project. The documentation everywhere mentions VDDUSB but that pin does not appear to be present on the LQFP48 package. Is it just tied to VDD internally? The data sheet appears to show that OTG FS is available on all of the different packages, so I'm not sure how the transceivers are powered.

If the VDDUSB is internally tied to VDD then does this imply that VDD >= 3V?

Thanks,

TG

[gbm · Accepted solution]

VddUSB should be around 3.3 V The separation of VddUSB from Vdd allows for powering the rest of MCU from some lower voltage. If it's not routed separately in a given package, it's internally shorted to Vdd, so for correct USB operation the Vdd must be at 3.3.