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DLP5531Q1EVM: The external clock source is out of range

Cherry Liang
Prodigy 170 points
Part Number: DLP5531Q1EVM
Other Parts Discussed in Thread: DLPC230-Q1

When I use the external video interface of DLP5531Q1EVM, I always get an error indicating that my external clock frequency is out of range. Why does it come out?

  • 0
    TI__Intellectual 2995 points

    Hello Cherry -

    Can you help me understand your setup? Are you connecting your PC / laptop via HDMI cable to the DLP5531Q1EVM?

    This error can occur when the DLPC230-Q1 does not recognize the proper video input timing parameters (specifically the Pixel Clock).

    Please verify that your video generator is configured correctly.

    Regards,

    Ross

  • 0 in reply to Ross Schneider
    Prodigy 170 points

    Hi, Ross.

    I have connected my PC/laptop to the DLP5531Q1EVM via an HDMI cable.

    When I used another laptop, I could let DLP display the content of the computer, but after changing the computer, it started to report errors, even if I set the frame rate and resolution of the two computers to be the same. Pixel clock error will still be reported. What Settings should I set to avoid this?

    All I did was connect and select the video source for the display. I even tried to select all the video sources, but it didn't work. In addition to that, what else do I need to do to ensure that my video generator is configured correctly?

    Regards,

    Cherry

  • 0 in reply to Ross Schneider
    Prodigy 170 points

    Hi, Ross.

    One of my computers has a built-in HDMI port, which allows me to display DMD videos normally. The other computer is VGA interface, I connected the DLP module with VGA to HDMI, but still reported pixel clock error. Is there a connection between the video display and the video interface?

    Regards,

    Cherry

  • 0 in reply to Cherry Liang
    TI__Intellectual 2995 points

    Hi Cherry - 

    What type of VGA-to-HDMI adapter are you using? It's important that the signal that connects to the DLP5531Q1EVM matches the timing from the DLPC230-Q1 datasheet:

    Have you confirmed that you can use this VGA-to-HDMI adapter setup with another HDMI input monitor?

     Regards,

    Ross

  • 0 in reply to Ross Schneider
    Prodigy 170 points

    Hi, Ross.

    We connected the VGA-to-HDMI adaptor to an HDMI monitor and it was able to display correctly.

    When the VGA-to-HDMI Adaptor is connected to the Eva board, any of the following choices in the Control Program software will report a PCLK error.

    I don't understand why there is such a problem.

    Regards,

    Cherry

  • 0 in reply to Cherry Liang
    TI__Intellectual 2995 points

    Cherry -

    Given this error message, I would recommend to measure the speed of the Pixel Clock on this interface.

    1) Download the EVM Design Files from https://www.ti.com/tool/DLP5531Q1EVM#order-start-development

    2) On the formatter board schematic, locate the PCLK signal:

     

    3) On the EVM Formatter Board, locate resistor R5 and measure with an oscilloscope.

    4) The Frequency should fall between 39MHz and 46MHz.

    Regards,

    Ross