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  • TI Thinks Resolved

PGA411Q1EVM: Not connecting to GUI

Part Number: PGA411Q1EVM

Hi, 

I am trying to connect the PGA411-Q1 EVM to the PGA41x-Q1 EVM GUI and there are a couple of things that I cannot seem to make it work. First, when I plug in the USB cable to my computer, the USB_RDY LED is constantly in a blinking state (I power on the device with 5VDC before I plug in the USB). There are random times when I can get the LED to stay solid, but when I do, the next problem happens; the GUI usually reads "Connection Status: connected" and "PGA41x-Q1 Device: Not Available." Based on the user manual, this makes me seems like the board isn't connecting. Every once in a while (totally random set of circumstances) the board will connect, and I get a status of "PGA41x-Q1 Device: Revision V111,11," which seems slightly odd. What can I do to make this work?

On top of that, when I probe the across the OE1 and OE2 pins, I don't see any excitation frequency. 

If you  have any advice, I would really appreciate it. 

Thanks, 

Manuel

  • Manuel,

    There is a trick to the EVM.

    • If the USB_RD LED is blinking, press the MCU_RST button until the LED is solid
      • It will take a couple of seconds after pressing the reset button until the LED will stay solid. It might take a couple of tries in some cases.
      • If you wait too long, the LED will start blinking again.
    • Immediately after the LED is solid, launch the GUI.

    You should be seeing Revision v11.1 for the "PGA41x-Q1 Device" and 2.6.5.53 for the "USB Firmware" field.

    If you don't have a resolver sensor connected, then the PGA411 will report a fault condition and you will not see anything on OE1 and OE2. Try holding the FAULTRES button on the EVM while monitoring OE1/OE2. Once you have the GUI working, you can also control the FAULTRES pin from the main page or the "Pin Configurations" page.

  • In reply to Clancy Soehren:

    Hi Clancy, 

    What a trick! I'll give this a shot and report back. Just to be clear, if I don't have the resolver connected, I can hold the FAULTRES button and I should see the excitation frequency across OE1/OE2?

    Side question: What current should the EVM board be drawing? I notice that the PGA411-Q1 chip immediately gets hot to the touch when I connect it to 5VDC. The board draws 0.98 Amps from my supply (seems high).

    Thanks,

    Manuel 

  • In reply to Manuel Ahumada:

    Manuel,

    That current is much too high! It should be drawing less than 100mA if no sensor is connected. Can you double check that all of your jumper settings match what we suggest in the user's guide?

    And yes, you can hold the FAULTRES button and you should see OE1/OE2 start to work. However, you should fix the high current draw problem before trying that.
  • In reply to Clancy Soehren:

    Clancy,

    Yeah, 100 mA sounds way more reasonable... Yeah, the jumpers are in the correct positions per the user manual. Maybe a short? Any obvious place I can check for that?
  • In reply to Manuel Ahumada:

    Manuel,

    First, can you send me a picture of your board?
  • In reply to Clancy Soehren:

    Clancy,

    Sent you a direct message, should I also post the picture here?
  • In reply to Manuel Ahumada:

    Manuel,

    Either way is fine. You can attach images to this forum post by using the "Insert code, attach files and more..." link.
  • In reply to Clancy Soehren:

    Manuel,

    We will continue the discussion for your specific board issue offline. So we can close this thread.

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