I'm using a K20 chip as a USB host, and I'm trying to figure out how I need to provide power to the USB regulator. Currently I have Vout33 and Vregin floating. The microcontroller is being provided 3.3V from a regulator on the circuit board.
Since my current configuration isn't working, I've been looking through the reference manual. I'm thinking about changing my circuit to the following:
- Connect pin Vout33 to Vdd (which is connected to my 3.3V power supply)
- Place a capacitor between Vout33 and ground
Can I get away with doing this, or do I need to provide 5V somehow to the USB regulator? It sounds like the USB regulator might not be happy with anything less than 3.6V...