AnsweredAssumed Answered

K20 USB host power circuit configuration

Question asked by Marlon Smith on Oct 22, 2013
Latest reply on Mar 10, 2016 by David Burton

Hi everyone,


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...