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DLP3010EVM-LC: 3.3V Trigger input does not work properly

Seung Gwan Son
Prodigy 35 points
Part Number: DLP3010EVM-LC

Hi,

To use internal pattern streaming mode with 3.3V external trigger, I've did them:

- connect pin 2 and 3 of J11 on main board

- connect pin 2 and 3 of J3 on light control display board

- for J4, use pin 5 as trigger in and pin 1 for ground

pattern set setting on GUI is like that: 

I uploaded these pattern sets, checked Trigger In checkbox with Active High and set, clicked Run Continuously button and started to put 3.3V triggers in.

However, patterns are not displayed properly. Actually, in about half of cases, patterns are displayed its right order, but in significantly many cases are not.

First pattern of each pattern set is displayed at completely random timing, and follow its sequence after that.

Sometimes, crashed pattern displayed that I've never input to EVM:

I want to ask some questions about that:

- I'm using 12V DC-5A DC power supply for this EVM. I know its board is also designed for 12V DC, but it is OK for 5A input?

- for trigger input, I found this IMPORTANT note at document:

Is it right that it means for Rev A display board, there can be some trouble to display internal patterns using 3.3V external trigger?

Then, how can I know that the board is Rev A or not?

Here is a photo of EVM board I have:

Please notify me if I missed some checklist to solve this problem.

Regards,

Son

  • 0
    TI__Mastermind 23070 points

    Hello Son,

    Welcome to DLP forum and thank your interest in DLP technology.

    The DLP3010EVM-LC required a 19 V power supply , not 12 Volt. Please change to correct power supply. Hopefully this will resolve issue.

    Please refer to EVM guide guide (section 8) at page 9 for details of setup.

    https://www.ti.com/lit/ug/dlpu070b/dlpu070b.pdf

    regards,

    Vivek

  • 0
    Intellectual 395 points

    Hi Son,

    In my testing with our own product I have seen the same failures when the external trigger signal is sent too quickly.  This can easily happen when using more than one pattern set in a pattern sequence because there is extra time required (in my testing usually 3-4ms) between pattern sets.  The Pattern Ready signal will be deasserted during this time so if you are monitoring that signal then you will know not to send triggers then.

    Noise on the trigger input can also cause extra false triggers, and it sounds like from your questions that you are investigating that possibility already.

    - Layne

  • 0 in reply to Layne Jenkins
    TI__Mastermind 23070 points

    Layne,

    Thank you. Appreciate your inside.

    regards,

    Vivek

  • 0 in reply to Layne Jenkins
    Prodigy 35 points

    Hi Layne, Thanks for your reply.

    As you said, I found that displayed patterns are crashed when external trigger is faster than period of patterns, 

    so I set the period of 1 pattern display as 800000 us like below:

    - pre-exposure dark time: 22400 us

    - exposure time: 500000 us

    - post-exposure dark time: 17760 us

    After that, I input trigger to projector for 1 time, wait 3~4 seconds, and so on.

    I thought I've waited long enough for projector's pattern preparation, but same pattern crash happens.

    I've modified pattern set configuration from 2 pattern sets of 18 patterns to 1 pattern set of 36 patterns(I thought if only 1 pattern set, there is no need to wait pattern ready signal for 36 pattern display sequence), and same pattern crash again.

    Do you have any idea that I must check further or configure wrong?

    Regards,

    Son

  • 0 in reply to Seung Gwan Son
    TI__Genius 9971 points

    Hi Son,

    I would recommend you to read the status of Pattern Ready Signal before sending the input triggers even if you are displaying patterns via 1 pattern set only. 

    It is always recommended to use Pattern Ready Signal while sending external input triggers.

     

    Thanks and regards,

    Mayank