> Yes, the board is self powered, so I left the USB Vdd pin unconnected.

Even so you will probably need to run a track from the USB Vdd pin to a cap=
acitor with a discharge resistor so that the host will detect when you plug=
 in the USB, and also to a pin on the chip so your program knows when the U=
SB is plugged in to enable the USB module.
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