i have noted a curious issue if i measure the VBUS Power Pin "USB_OTG2_VBUS" . For a better overview please let me introduce the schematic constellation:
"USB_OTG1_VBUS" is connected to the conventional 5V VBUS to a USB Port. "USB_OTG2_VBUS" is supplied with an internal switchable 5V due to a FET.
If the device is switched on with plugged-in USB Port 1 and corresponding VBUS from PC, at "USB_OTG2_VBUS" Pin i can measure a coupled voltage level from the VBUS from Port 1. If Device is switched off and USB to PC is still connected i can still see the coupled voltage at "USB_OTG2_VBUS". This is an unwanted issue.
Why does it happens ? I thought "USB_OTG2_VBUS" is only a conventional input power pin....
At moment i have solved the problem while i use a diode that no VBUS from Port 1 is coupling the inernal circuit.
Thanks beforehand for your efforts.