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LMH6401EVM: LMH6401EVM GUI not responding

Jon Martens
Prodigy 40 points
Part Number: LMH6401EVM
Other Parts Discussed in Thread: LMH6401

Installation seems successful (and the connection to the board registers) but all writes to the device fail and all reads come back as 0.  Ideas?

  • 0
    TI__Genius 15975 points
    Hi Jon,

    Is the LMH6401EVM powered on with +/-2.5V supplies and drawing the right current of ~69mA?

    Best Regards,
    Rohit
  • 0 in reply to Rohit Bhat
    Prodigy 40 points
    Hi,

    Yes, biased and current draw is close (closer to 60 mA).
  • 0 in reply to Jon Martens
    TI__Genius 15975 points
    Hi Jon,

    The supply current seems to be on the low side. What supply voltages are you powering the LMH6401EVM with? You are connecting all the VS+, VS- and GND pins, and not just the VS+ and VS- right?

    Do you see the USB status as connected or "Green" on the LMH6401 EVM GUI?
    If yes, then would it be possible for you to unplug the USB connection, close the GUI, re-plug the USB connection and re-start the GUI such that you can read/write the registers.

    Best Regards,
    Rohit
  • 0 in reply to Rohit Bhat
    Prodigy 40 points
    Hi,

    Yes, using all three lines and was using +/-2.5V most recently. I had also tried using +5/0 also but the result was the same.

    The green connected light does appear (and unplugging/restarting did not seem to help nor did just trying to refresh the connection from within the GUI).

    Thanks
  • 0 in reply to Jon Martens
    TI__Genius 15975 points
    Hi Jon,

    It seems strange that the supply current you are recording is only 60mA. Would it be possible for you to use +/-2.5V supply only (mainly for debugging purposes) and short across the Jpd connector to see whether the device powers down? I would expect the supply current to be ~9mA which confirms that the device GND connection is present. Talking to the device through the GUI is only possible if the GND connection is present on the EVM.

    Also, what windows operating system are you using? I think the GUI is written only for Windows 7 and will not support Windows 10 OS.

    Best Regards,
    Rohit
  • 0 in reply to Rohit Bhat
    TI__Genius 15975 points
    Hi Jon,

    Were you able to resolve your issue with respect to the LMH6401EVM GUI?

    Best Regards,
    Rohit
  • 0 in reply to Rohit Bhat
    Prodigy 40 points

    Unfortunately, No.   The power-down did not respond so am starting to think the part itself failed.

  • 0 in reply to Jon Martens
    TI__Genius 15975 points
    Hi Jon,

    I see. Is it easy for you to get hold of a local TI sales guy in-order to replace the LMH6401EVM? It was suspicious to hear that the EVM only drew 60mA, and now it does not even power down.

    Best Regards,
    Rohit