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DLP9500: Over current

Uryyy
Expert 1800 points
Part Number: DLP9500
Other Parts Discussed in Thread: DLPC410, DLPA200

Hello,

When DLPA200A open drain SCPDO is low, I think DLP9500 DCPDO outputs 99mA current as below. Please let me know the reason that there is not problem in the reference schematic. Is there an internal pull up register in DLP9500 SCPDO?



Regards,

Uryyy

  • 0
    TI__Mastermind 43165 points

    Hello Urrry,

    This will require consulting with our DMD team.  Likely there is an internal resistor, but need to confirm with DMD team.

    Fizix

  • 0 in reply to Fizix
    Expert 1800 points

    Hello Fizix,

    How about the progress?

    Regards,

    Uryyy

  • 0 in reply to Uryyy
    TI__Mastermind 43165 points

    Hello Uryyy,

    Sorry for the longer than expected delay.  We got the answer just this morning.

    When SCPENZ is high (not active) all the other pins should be tri-stated.

    When is talking to the DMD the SCPDO on all other devices on the bus should have their SCPDO at high Z (tri-stated).

    When talking to the DLPA200s, the DMD SCPDO should be at high Z (tri-stated).

    Therefore this current flow will not occur.

    Fizix

  • 0 in reply to Fizix
    Expert 1800 points

    Hello Fizix,


    Let me ask again based on above answer. Is there a case to read data on SCPDO from DMD to DLPC410 during CPENZ being low?
    If the case does not occur, my concern will be cleared. Then, I think it doesn't need the connection from DLP9500 SCPDO to DLPC410 SCPDI. Please let me know whether it's problem or not regarding the disconnection.

    Regards,

    Uryyy

  • 0 in reply to Uryyy
    TI__Mastermind 43165 points

    Hello Uryyy,

    I am not sure I understand your question.  The situation that you describe is the only way that the DLPC410 communicates with the DMD.  The DLP9500 SCPDO to DLPC410 SCPDI is required.  This is how the DMD ID is read by the DLPC410 controller for configuring the system to the correct voltages on the DLPA200.

    What is the concern?

    FIzix