Edit: sorry for the short tile, I was having problems posting (http://forum.allaboutcircuits.com/showthread.php?t=81830) I need a sanity check with a simple circuit for using FTDI's FT231X chip. After many, many checks I'm pretty sure the schematic and board layout are correct: https://www.dropbox.com/sh/w7slz8sjkgozwcz/AAChFTKg7JEIkihklc2pn5Yya *Both source files, and .pdf printouts available. Source files are for EAGLE 6.5 I'm not even hooking up the VREG. I only have USB power connected directly to the FT231X chip by removing the PTC and Diode and just using 0-Ohm resistors in their place. I can read ~5V before hooking up the FT231X. As soon as I do, the VIN drops down to 2--3V. Do I have some glaring mistake that I am failing to see? Thanks in advance for your help.