VBUS connection

[zeldin]

In the schematic, the power input (Vin) is connected directly to VBUS on the USB-C connector. I don't think this is correct. A USB-C device should not source VBUS unless it detects a pull-down of CC by the other side. Consider connecting the board to a USB host using a C-to-A cable. The host will always source VBUS (because it is a type A port), and the cable will pull up CC to indicate a current source. But the TinyFPGA-EX will ignore this and also source VBUS from Vin. Not good.

There are chips like Microchip UTC2000 that can help in correctly implementing either a Upstream Facing Port or a Downstream Facing Port, but at the very least some mechanism (jumper, diode, FET, ...) to separate +5V from VBUS is needed I think.