Ft2321x

Discussion in 'The Projects Forum' started by zbot1, May 12, 2014.

  1. zbot1

    Thread Starter New Member

    May 12, 2014
    1
    0
    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.
     
  2. enggricha

    Member

    May 17, 2014
    62
    1
    check the link to the files...