1. USB_OTGx_VBUS is the input for the external VBUS voltage. When the port operates as USB Device, this input should be supplied by the VBUS voltage from the USB connector. When the port operates as the USB Host, this input should be supplied by an external on-board +5V supply that also provides the VBUS voltage to the USB connector.
2. USB_OTGx_PWR is the logic output, operating as GPIO to control an external switch that provides the in-system VBUS power in Host mode.
3. USB_OTGx_OC is the logic GPIO input that allows the USB core to detect the VBUS overcurrent (overload) event with an external current sensor when operating in Host mode.
Have a great day,
Artur
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