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DLPA2000: Fast Park conditions

Part Number: DLPA2000
Other Parts Discussed in Thread: DLPC3433

Hello, I have a custom board with the DLPA2000 and the DLPC3433. I made an initial test setting PROJ_ON high and it worked fine. I could see the splash image in the display. However, after some hours I reconnected my setup and no light came to the display. I debugged and found the fast park condition. Reset is going low around 40 uS after ParkZ goes from high to low. So nothing starts now. The setting has not change, and I would like to find out what is causing the park condition. The datasheet suggests some power failure, but so far all power rails are there and at good values. Any suggestion?

  • Wladimir,

    When you say "after some hours" do you mean to say that you set power off, left the system, and find the system to no longer power on later?

    If so, did you manipulate the system in any manner between first and second operation? Aside from power rails, are other startup signals coming up OK? You can check them against the power up timing diagram on the DLPC3433 datasheet.

    Failing that, do you have a schematic you can share of your design?

    Regards,

    Philippe

  • After I saw the splash image, I powered down and disconnected the power supply. Then, when I powered up again it did not work. Yes, I can check the power up timing, and that's why I identify a fast park. The reset comes high for around 30 ms. and then it goes low. IntZ from the DLPA goes up and around 40uS after reset goes low, INTZ goes low too. Thus, I concluded the fast park. I wanted to know what exactly could trigger that in order to check it with more detail 

  • Wladimir,

    Thanks for elaborating. Given the circumstances it does seem more likely than not to either be a connection issue with your hardware, or a problem with your schematic. If possible, can you share your schematic so that the team can review it?

    Regards,
    Philippe

  • I accidentally marked the final answer as solution, and I cannot write more in the feed. Can I send  the schematic directly to you, I would like to avoid to post it publicly

  • Hi Wladimir,

    I will be following up with a friend request so that the schematic can be shared privately.

    Regards,

    Austin