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FDC1004 EVM: frequent disconnection / unable to connect (red LED always ON)

Vincent Halde
Prodigy 120 points
Other Parts Discussed in Thread: FDC1004EVM, FDC1004

Hi,

I am currently working with the FDC1004EVM board. I have cut appart the original sensors and I have connected a home made sensor. Now, the pins CIN1, SHLD1 and SHLD2 are connected to some cooper electrode.

When I try to connect the FDC1004EVM board, the red LED is ON and no connexion is made (the GUI display "no connect"). Sometimes, when I touch the output pins while connecting the device, the green LED turns ON and I am able to speak to the device with the GUI. 

I have seen somewhere that maybe the MSP430 turns the red LED when the sensor is detected as "not the original one". That wouldn't be problematic if I was still able to communicate with the device, which is not the case. 

Do you see any explanation why this would happens, and how to fix it?

Thank you for your time, I hope I was able to be clear enough...

Vincent

  • 0
    TI__Expert 6480 points
    Hi Vincent,

    One thing you can try is to open the Windows control feature, "Device Manager", and then open the GUI. This has solved issues in the past with unstable connections. A different sensor should not affect the GUI connection but you're right, if the sensor frequency is now out of range of the default, the red LED will turn ON.

    Thanks,
    Rachel
  • 0 in reply to Rachel Liao
    Prodigy 120 points
    Hi Rachel,
    Thank you for your quick answer!

    I have try to open the "Device Manager" window and then open the GUI, and it has not worked.

    When I am able to be connected, the green LED is always ON, even if there is only CIN1, SHDLD and SHLD2 connected (I would have expected the red LED to be ON since CIN4 is unconnected (unlike the original sensor). Notice that I am using the FDC1004 (not the FDC21XX).

    Does the red LED have another hidden function on the FDC1004?

    Thank you very much, I appreciate your time,
    Vincent
  • 0
    Prodigy 40 points
    Are you running Windows 10? When I first plugged in my eval board I had similar no connection issues. It worked out that my laptop was busy doing Windows 10 housekeeping and downloads, and left the USB peripheral for periods of time. I let the OS stabilize, and after about 1/2 hour I had a steady connection. Recall that Windows is not a real time operating system.
  • 0 in reply to Herb Perten40
    Prodigy 120 points
    I tried on 2 computer, one running windows 10, and the other running windows 7. On the windows 10 computer, the disconnection is lest frequent (but the computer is newer, more powerfull).

    I will try to let the computer run a certain time before connecting the FDC1004EVM. I'll let you know if it's better!
    Thank you,
    Vincent
  • 0 in reply to Vincent Halde
    TI__Expert 6480 points
    Hi Herb,
    Thanks for your suggestion!

    Hi Vincent,
    Let me know if it works now. If not, I can do a little more digging but as of now, there does not seem to be any hidden function of the red LED on the FDC1004.

    Thanks,
    Rachel
  • 0 in reply to Rachel Liao
    Prodigy 120 points
    It is now working for nearly 2 hours without disconnection. For now, this is the best answer I have to this problem.

    Thank you for your time!
    Vincent