VBUS sense and ID for USB OTG on STM32U595

[jt94093]

I am using the USB port on a STM32U595 in device mode only. I am not using a type-C interface with a CC controller. I see that the NUCLEO144_Q with STM32U575 divides the USB VBUS input and connects it to PC2 for use as VBUS_SENSE.

[Q1] Do I need to connect PA9/PA10 (USB_OTG_HS_VBUS and USB_OTG_HS_ID) on the U595?

[Q2] If so, what is the recommended approach? For example, tie USB_OTG_HS_VBUS directly to the 5V VBUS input and tie USB_OTG_HS_ID to VDD to indicate device role?
[Q3] How is PC2 used for VBUS_SENSE on the U575 NUCLEO board - just as an interrupt or general-purpose input?

[Q4] Should I connect VBUS to PC2 like the NUCLEO board instead of using USB_OTG_HS_VBUS?

Thank you  -Jason

[FBL · Accepted solution]

Hi @jt94093 

>Q1 you do not necessarily need to connect the USB_OTG_HS_ID pin if you're not implementing OTG functionality (change role host to device and vice versa ). However, the USB_OTG_HS_VBUS need to be connected for VBUS detection,

>Q2 The recommended approach is detailed in schematics, 

>Q3 Check the examples provided in cube firmware and you can see if the PC2 is used as EXTI.

[jt94093]

Hi @FBL. Thank you, I'll just support all of these connection options on the board and we should be covered.

Jason