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DLPA200: DLPA200 voltages not present

KB
Prodigy 160 points
Part Number: DLPA200
Other Parts Discussed in Thread: DLPC410, DLP7000

Tool/software:

I have designed a custom PCB using the DLP system (DLPC410, DLPA200, DLPR410, DLP7000).  In my design, the DLPA200 is not providing the VBIAS, VRESET or VOFFSET voltages that are expected--all are 0V.  The V5REG rail is at 5V, RESET is high.  Can you point me in a direction of things to start looking at?  Are these voltages supposed to be present at all times once the chip is powered?  What could keep the chip from providing these voltages?  I have provided a picture of the schematic as well.

  • 0
    Prodigy 160 points

    We may have found the issue--SCPDI and SCPDO need to be swapped.  Testing this now and will update.

  • 0 in reply to KB
    TI__Mastermind 44890 points

    KB,

    I suspect this will fix the issue.  During initialization the SCP bus is used to query the DMD to find out which device is attached and therefore set the DLPA200 voltages.  If no DMD is detected they will not enable.

    Let us know.  Thanks.

    Fizix

  • 0 in reply to Fizix
    Prodigy 160 points

    We were able to successfully detect the DMD type, but I don't think the DLPC410 is able to inform the DLPA200 of that information.  We managed to swap the SCPDI/DO on the DLPA200 and so far it seems to be working.

  • 0 in reply to KB
    TI__Mastermind 44890 points

    KB,

    Are saying that with the swap, the system is working correctly now?  I believe the SCP bus is used by the DPC410 to communicate with both the DLP7000 and the DLPA200.

    Fizix

  • 0 in reply to Fizix
    Prodigy 160 points

    Yes with the swap it is working so far.  I had the DLP7000 connector correctly wired, just not the DLPA200, so the DLPC410 was able to communicate with the DLP7000 (and detect the DMD type), but it could not tell the DLPC410 how to configure based on the DMD type. Unamused

  • +1 in reply to KB
    TI__Mastermind 44890 points

    Hello again KB,

    I am going to mark this thread as closed.  Would you mind doing the honors of confirming that it is resolved.

    What actually happens is that during initialization the DLPC410 communicates with the DMD and determines the type.  Then DLPC410 instructs the DLPA200 to set up the correct voltages but was not able to communicate with the DLPA200 so no voltages were set up.

    I am glad you got it figured out.  Good sleuthing! 

    Fizix