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DLP4710EVM-LC: DLP4710EVM-LC Single LED operation

MarkCh
Prodigy 40 points
Part Number: DLP4710EVM-LC
Other Parts Discussed in Thread: DLPC3479, DLPA3005

Hello, I am currently working on a project that requires me to keep only one LED ON, (say the blue LED), while keeping the red and green LEDs turned off. Additionally, I need to set both the pre-exposure and post-exposure time to zero. Furthermore, it is crucial to synchronize the refresh rate of the Digital Micromirror Device (DMD) with that of the image sensor. Could you kindly provide guidance on how I can successfully accomplish these requirements? Thank you.

  • 0
    TI__Genius 12575 points

    Hello User,

    Welcome to the E2E forum and thank you for your interest in DLP® technology.

    A red only LED firmware version is available for the DLPC3479 (the controllers on the 4710EVM-LC) on the TI Firmware Selector Tool. I recommend flashing this firmware onto your EVM and routing the desired LED to the red channel.

    The DLP® Display and Light Control EVM GUI Tool will allow you to set exposure times. Please refer to the GUI User's Guide for instructions.

    The trigger signals will be needed to be used to synch with the sensor. The use for the triggers, please refer to Section 7.3.2 of the DLPC3479 datasheet and Sections 3.5 through 3.5.8.2 of the DLPC3479 Software Programmer's Guide.

    Regards,

    Austin

  • 0 in reply to Austin Snyder
    Prodigy 40 points

    Hello,

    I have not yet managed to resolve this issue. Any assistance would be greatly appreciated.

    Thank you sincerely.

  • 0 in reply to MarkCh
    TI__Genius 12575 points

    Hello User,

    Can say what the issue is currently? We have addressed a few points in the previous post. It would be helpful to know what progress has been made.

    Regards,

    Austin

  • 0 in reply to Austin Snyder
    Prodigy 40 points

    Hello Austin,

    - I flashed the red only LED firmware, but it looks it doesn't do what I need. I want the other two LEDs (in this case let's say blue and green) to be completely OFF and all the duty cycle to be dedicated to the red LED. 

    - Could you please how I can channel the blue LED to the red channel? Is it possible to update the firmware or should I physically replace the LED?

    - To elaborate, I need the blue LED ON (the other two OFF and I don't want any duty cycle for these two). 100% of the duty cycle. Also, no refresh rate on the DMD. I need a constant, uniform illumination in my sample. And I want this constant illumination to be synchronized with an image sensor exposure time. 

    Thank you 

  • 0 in reply to MarkCh
    TI__Expert 5290 points

    Hello User,

    If you are using Light Control commands there is no proper RGB duty cycle. You just set the Pre-exposure, exposure, and post-exposure times in monochrome.

    It would be easier to use the blue LED in place of the red channel. I would check that the anode and cathode is correct when swapping LEDs.

    There are limitations on how low the Light Control timings can be set.

    Regards,

    John

  • 0 in reply to John McKnight
    Prodigy 40 points

    Thank you for your reply.

    I think I'm a little bit confused on how to actually use this firmware and what it does. I flashed the firmware using Firmware->Flash Firmware->Start Update.
    After the flash process is finished, I go to light control section. But I can still change the illumination to any color! Thank you

  • 0 in reply to MarkCh
    TI__Expert 7840 points

    Hello User,

    Can you please confirm if you programmed the "FWSel_DLPC3479_DLPA3005_pm2_i2c0x36_v8p1p1_RED_LED_ONLY.img" by using GUI? When you programming, keep SW28 ON and without pushing SW21. After successful programming, you should only see the red image displayed. 

    This firmware version only enabled Red LED, but you can use the blue LED in place of the Red channel as my colleague mentioned above. 

    In the Advanced version -> Commands -> Illumination of the GUI, you can use Read RGB LED Enable (53h) command to confirm if only Red LED is enabled. 

    Regards,

    Lori