No Transmission From FT232RL

Discussion in 'General Electronics Chat' started by xXGiuseppeXx, Sep 2, 2016.

  1. xXGiuseppeXx

    Thread Starter New Member

    Jul 30, 2012
    24
    0
    Hello all,

    Not much experience using a FT232RL chip bit anyone with some experience on it would be of great help!

    I recently made a board that has an FT232RL on it. Here is a link to the PDF
    http://www.ftdichip.com/Support/Documents/DataSheets/ICs/DS_FT232R.pdf

    The picture of my schematic is attached.

    I have verified that power is getting to the chip. I also looked on a scope and the power rails look clean. I have installed the FTDI drivers from Sparkfun's site https://learn.sparkfun.com/tutorials/how-to-install-ftdi-drivers/windows---quick-and-easy

    When I plug my designed board in, I get some RX led activity and then I get a COM port assigned. Good start! Now I used this site to see how to properly test everything http://www.ladyada.net/wiki/ftditest

    Of course, I do not have a cable but I imagine it would be the same process. On step 3 is where things start not working. For some reason, I am not getting any data to transmit from the IC. I initially tried using the Arduino serial terminal to try a loopback test (shorting RX and TX lines on the IC). Nothing. I tried it at slower and higher speeds and still nada. So I decided to hook up TX on a scope and placed a long time division just to see if I can see some activity when I hit enter to drive a character from the terminal to the IC. And still nothing.

    So where I think I am going wrong is that perhaps the FT232RL chip needs to be configured? I thought the default arrangement would be fine but now I am not too sure. I thought maybe that my IC was holding reset at low but there is definitely a high there. Other than that, I am not sure where else to troubleshoot. I have also gotten IC from a reputable vendor (Digikey) so I can't imagine it being a fake?

    Has anyone come across the same problem?
     
  2. xXGiuseppeXx

    Thread Starter New Member

    Jul 30, 2012
    24
    0
    Nevermind! It appears that I had a cold solder joint on my board. Amazing how something so small wastes a good hour. For anyone wanting a good reference circuit, just use the last attachment.
     
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