On the ATmega32U4 MCU there are several pins related to USB:
- VBUS
- D+
- D-
- UCAP
- UGND
- UVCC
In the datasheet and in almost all reference schematics I find on the Internet, it's explained how to connect those pins when you need the USB.
On my board, instead, I don't need the USB at all.
Hence, I want to understand how to connect those pins.
I'm not sure if I can just leave them floating or else.
Best Answer
The datasheet does have that information.
You can make a self-powered USB device as per the datasheet diagrams and imagine the USB cable is unplugged, which gives enough information how the pins should be connected without USB connection.