I constantly get "USB device not recognized". The device works fine (direct connection with usb cable). I measured 5V on VDD1 and the isolated 5V on VDD2.
Schematic is like above, PDEN (pin 4) is connected to VDD1 and PIN (pin 12) is connected to VDD2. I don't have pull-up resistors. Even when I don't even connect my arduino on the right side, my computer still says "USB device not recognized". Connections are good. What could be the problem?