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DLP6500FYE: DLP6500FYE trigger input (in DLi6500 Development Kit) is not working

Ho Lim
Prodigy 10 points
Part Number: DLP6500FYE
Other Parts Discussed in Thread: DLPLCRC900EVM, DLPC900

Tool/software:

Hello!

I’m Ho Lim working for SD Optics, Inc. in Korea.

There is an issue on using DLP LightCrafter 6500 (DLi 6500 development Kit), MCU and a camera.

In the test setup, MCU sends the trigger signal to DLP.
And then DLP delivers trigger signals to the camera (HW trigger).

There is no issue between DLP and camera.

But when MCU sends a trigger signal, DLP doesn’t respond.

 

GPIO’s of MCU (STM M4, 3.3V) are directly connected to trigger inputs of DLP.

With a scope, the signals are monitored.

But trigger input #1 shows 2.7V level while input #2 displays 1.2V.

The voltage level doesn’t seem to be good, which should be 3.3V I think.

Signals can have any width (from 25us to 100ms).

So, please let me have the schematic only for the trigger input side.

Well, if you have any other ideas, please let me know.

 

Thank you !

Regards

 

PS) Some photos are attached for your reference.

1) MCU and DLP6500 connection

2) J20 connector setup

3) DLI6500 Development Kit

4) Trigger input #1 signal

5) Trigger input #2 signal

6) DLP setup for trigger input

  • 0
    TI__Intellectual 2915 points

    Hello Ho Lim,

    Thank you for reaching out to us.

    You can find the hardware design files for DLPLCRC900EVM here - https://www.ti.com/tool/DLPLCRC900EVM#design-files

    I would recommend to check the signals right at the connector, after the buffer, and after the level shifter, as highlighted below:

    Thank you,

    Regards,
    Aishwarya

  • 0 in reply to Aishwarya K Aithal
    Prodigy 10 points

    Hello Aishwarya,

    Thank you for the detailed information and materials.

    They are very helpful to me.

    I will check the signal path for trigger inputs and will update you with the result.

    The DLPC900 document says that trigger input #2 need to be set High, which was low in previous tests.

    This will be also tested.

    Test results will be updated shortly.

    Thank you again.

    Ho Lim

  • 0 in reply to Aishwarya K Aithal
    Prodigy 10 points

    Hello Aishwarya,

    Today, I had some tests on trigger path.

    It was found that U26, U28 chips were damaged accidentally.

    They were removed and directly connected since there are no available chips at the moment.

    After that, trigger #2 was set HIGH all the time.

    And trigger #1 was used to produce a trigger pulse.

    After all, camera image capture was successful as planned originally.

    Your help was very timely and nice.

    I do appreciate it.

    This item is closed now.

    Thank you and Regards,

    Ho Lim