USB OTG VBUS- and ID-Pin

harira · ‎2009-12-27

Posted on December 27, 2009 at 20:01

harira · ‎2011-05-17

Posted on May 17, 2011 at 13:35

Hello,

i want to use my STM32F107VC as a peripheral with virtual COM-port.

Do i have to connect the VBUS- and ID-pin to the USB-connector?

I need these two pins for other purposes.

Thanks,

C.H.

chikos33 · ‎2011-05-17

Posted on May 17, 2011 at 13:35

Good news:

For sure, you don't need the ID pin connected since you don't use OTG mode. :)

Bad news:

For the VBUS pin, I think you have to connect it to the USB connector/adapter... in all cases. :(

I hope this helps you.

tomas23 · ‎2011-05-17

Posted on May 17, 2011 at 13:35

The Vbus connection to PA9 is needed for two reasons:

1. HW detecting that host is connected and the USB voltage is valid

2. used as a reference for connecting internal 1k5 pull-up between D+ and Vbus to signal, that the device is full-speed and ready for enumeration.

All info can be found in RefMan (RM0008).