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DLPLCR6500EVM: Problems with connection and trigger output

micro polimi
Prodigy 140 points

Part Number: DLPLCR6500EVM

Hi,

I'm having some issues in controlling the DLPLCR6500. Problems began when I inserted all the components for using the trigger output 2 port. I connected the Trigger output connector pins 5 and 6, as indicated in the guide, with a cable that terminates with an SMA, that in turn is connected to an Hamamatsu camera.

When I first tried the trigger (yesterday) there were no problems, since I was able to control it with the software and to use the trigger as well. Today, when I turned on the device, my PC could not see it, and not even the software. I tried to change usb port, restart my PC, try another PC, and it turns out that only sometimes the PC was able to see the device, but in a non replicable way, and, even in this lucky case, as I connect the SMA cable to the camera, it disappears from the connected device list, while, as disconnected from the camera, it appeared again. As I said, this happened only two-three times, while, for the rest of the time, it resulted as not connected, independently from the SMA connector.


The trigger input of the camera is 3.3V LVCMOS level, with an input impedance of 10kOhm.

What can I do? I would also like to know if I need to connect the supply of the trigger output 2 (pin 4 ) for some reason (now it's not connected to anything).

Thank you,

Michele

  • 0
    TI__Expert 4530 points
    Hi Michele,

    Welcome to DLP section of TI E2E community.

    If you are providing external supply on J24.1 amd J24.4. Then please make sure there should be no jumper installed on J22 and J25 otherwise you will be shorting your supply with 1.8V or 3.3 V board supply.

    Otherwise do not provide external supply and set J22 and J25 to appropriate voltage.

    -ykc
  • 0 in reply to ykc
    Prodigy 140 points

    Hi,

    there is no external suplpy provided on J24.1 and J24.4m but there is a jumper both on J22 and J25, in such a way to have a voltage of 3.3V  (so the jumper is between pin 1 and 2). We tried this way since we didn't understand from the guide what was the right selector for the trigger output 2, so we jumped both to be sure. But we also tried to use only one jumper, then to remove the jumber and the cable, and it still doesn't work.

    Any idea?

    Thank you again,

    Michele

  • 0 in reply to micro polimi
    TI__Expert 4530 points
    Voltage selector is based on your external system expected voltage levels. If your external system operates at 3.3V then use J25.1 and J25.2.
    J22 is independent of J25 and is used for selecting levels for trigger out 1.

    Now something has gone bad on your board.

    Please check this post for testing USB circuitry.
    e2e.ti.com/.../758307

    -ykc
  • 0 in reply to ykc
    Prodigy 140 points
    Hi,

    Thank you again, I will check today the USB circuitry. In the worst case, what am I supposed to do? Replace the U12? And, if this is the case, how am I sure to not have the same problem? I would like to know if you can provide me some possible cases that caused this (probable) breaking of the circuitry, in order to prevent any dangerous operation.

    Thank you,

    Michele
  • 0 in reply to micro polimi
    TI__Expert 4530 points
    Hi Michele,

    Yes you have to replace U12 if it is bad. It can be caused due to accidental short.

    -ykc
  • 0 in reply to ykc
    Prodigy 140 points

    Hi,

    Thanks a lot again. It's really strange because, after some time we have disconnected all the cables, it returned to work normally, in the sense that the PC follows perfectly the device status and I can control the DMD without any problems. So I suppose the U12 is not bad, but I cannot understand what's happened, since there is a sort of time interval that I have to wait after the disconnection of all cables to return to the "normal" status. Anyway, it could be a problem with the camera... I will look more carefully on both DMD and camera documentation to make all steps correctly. If I see other strange behaviours, I will recontact you.

    Thank you,

    Michele

  • 0 in reply to micro polimi
    TI__Expert 4530 points
    Hi Michele,

    Thanks for update. You can reopen this thread if need arises or create a new thread if this thread is locked.

    -ykc
  • 0 in reply to ykc
    Prodigy 140 points

    Hi,

    I have some updates.

    Yesterday, for curiosity, I have tried to use the DMD with the trigger output with my PC (not my lab PCs). It worked perfectly fine! And all this while having the same problem with the other PCs. All this until today, when it stops working with every PC! (The same problem I stated in previous posts). It's clearly a problem with the DMD, but I cannot understand why this is happening! I controlled the U12, and it's not bad.

    I have to present my work with the DMD, so I am short of time... What can I do to make it work?

    P.S. I have tried again all the trivial solutions such as restarting PCs, disconnecting cables, etc...


    Thank you,

    Michele

  • 0 in reply to micro polimi
    TI__Expert 4530 points

    Hi Michele,

    Does device manager recognise any device connected when you plug usb cable from kit to PC?

    -ykc 

  • 0 in reply to ykc
    Prodigy 140 points

    Hi,

    No, if the device is not recognized by the PC, and, obviously, by the software neither. The times when in the device manager appears the device, the software recognize it.

    Michele

  • 0 in reply to micro polimi
    TI__Expert 4530 points
    Hi Michele,

    When it is not working what is voltage on U12.1 and TP16.

    -ykc
  • 0 in reply to ykc
    TI__Expert 4530 points
    Hi Michele,

    Haven't heard back from you. Were you able to fix the problem?

    -ykc
  • 0 in reply to ykc
    TI__Expert 4530 points
    Hi Michele

    I haven’t heard back from you, I’m assuming you were able to resolve your issue. If not, just post a reply below (or create a new thread if the thread has locked due to time-out)

    Thanks,
    ykc
  • 0 in reply to ykc
    Prodigy 140 points
    Hi ykc,

    Sorry for my absence, I could not work on the problem during these days. Anyway, now it's working quite fine, or kind of. I don't know if it is going to have problem again. Anyway, if it is, I reply below, or open a new thread. Thank you very much for your patience.

    Michele
  • 0 in reply to micro polimi
    TI__Expert 4530 points
    Ok. Thanks for update.

    -ykc