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DLPA200: VOFFSET Issue on Custom DMD Board Using DLPC410 and DLPA200

KAZUHIKO KIMURA
Prodigy 10 points
Part Number: DLPA200
Other Parts Discussed in Thread: DLP7000UV, DLPC410, DLPLCRC410EVM

Tool/software:

Dear Texas Instruments Support,

I am an engineer developing optical equipment using DLP technology.

Over the years, I have developed numerous DMD control boards. However, with a newly designed DMD control board, I am facing a serious issue: the DMD does not operate at all. I would greatly appreciate your assistance.

Although Texas Instruments has authorized distributors here in Japan, I have not been able to receive appropriate support from them. Therefore, I am reaching out to you directly.

Below, I have included a block diagram of the circuitry around the DMD, along with waveform captures of the output voltages from the DLPA200.

I am attempting to operate the DLP7000UV. The suspected cause of the malfunction is that the VOFFSET output from the DLPA200 does not reach the specified value of 7.5V. The other voltages, such as VRESET and VBIAS, appear to be within the expected ranges.

I have programmed the DLPC410 using the ddc4100_32Mib.mcs file downloaded from the MySecureSoftware Site. Based on the status of LED0 and LED1, it appears that the DLPC410 configuration completes successfully.

The surrounding circuitry for both the DLPA200 and DLPC410 is identical to that of the official evaluation (EVM) board schematics.

Despite this, the VOFFSET voltage does not reach the expected level. Could you please advise me on any possible causes for this issue?

If any additional information is needed, please let me know.
I will provide it promptly.

I sincerely appreciate your support and assistance.

Best regards,

  • 0
    TI__Guru 54705 points

    Hello Kazuhiko-san

    Looking at the VOFFSET waveform, there seems to be something is clearly wrong on the rising edge.  If I read the scope image correctly we are looking at 1s/div.  That means something is seriously dragging down VOFFSET.  

    I suggest isolating the output at the DLPA200 of VOFFSET to see if it is putting out the 7.5 V correctly.

    Fizix

  • 0 in reply to Fizix
    TI__Guru 54705 points

    Hello again Kazuhiko-san

    I just noticed that the diagram says that no DMD is attached.  Part of the initialization reads the DMD ID to determine the VOFFSET Voltage to set.  Without the DMD I do not know what the output voltage will be set to.  

    Fizix

  • 0 in reply to Fizix
    Prodigy 10 points

    Dear Fizix-san,

    Thank you for your reply.

    On the DLPLCRC410EVM DLP Evaluation Module, VOFFSET was measured to be 7.5V even when no DMD was connected. Therefore, I believe the presence or absence of the DMD is not related to this issue.

    Could there be any other possible factors that might cause this issue ?

    I would appreciate your continued support.

    Best regards,

  • 0 in reply to KAZUHIKO KIMURA
    TI__Guru 54705 points

    Hello Kazuhiko-san,

    Can you tell me the revision of the DLPC410 code on the EVM that the 7.5V was measured on?

    I am also confused because without a DMD attached, if I remember correctly VBIAS should not go to 26 Volts.

    Also, would you be interested in a telephone conference?

    Fizix

  • 0 in reply to Fizix
    Prodigy 10 points

    Hello Fizix-san,

    Thank you for your response.

    The data indicating that VOFFSET is output as 7.5V on the DLPLCRC410EVM DLP Evaluation Module even when the DMD is not connected was provided by a distributor in Japan. I am currently asking the distributor to check the DLPC410 code used on that EVM, so I would appreciate your patience while I wait for their confirmation.

    Regarding the phone conference, I am not very fluent in spoken English, but I believe I should be able to manage if you could kindly speak slowly.

    Thank you again for your continued support.

  • 0 in reply to KAZUHIKO KIMURA
    TI__Guru 54705 points

    Kazuhiko-san,

    I will await your response on the DLPC410 version for the EVM.  You should be able to connect with the DLPC410 GUI and get the "About" information.

    Regarding a possible call, I can have one of our Japan FAE's join a call to help with language,  I promise my Japanese is much worse than your English.

    May I reach out to you via the email associated with your my.ti.com account?

    Fizix

  • 0 in reply to Fizix
    Prodigy 10 points

    Sorry for the delayed response; it is currently the summer holiday season in Japan.
    I am attaching a screenshot of the "About" screen from the DLPC410 GUI. It seems that the version number of the DLPC410 is displayed as a dash.
    I have also attached a photo of the PROM. Could you please let me know if anything can be identified from this number?
    Thank you very much for your confirmation.

    You may also contact me by e-mail if that is more convenient.
    Thank you for your continued support.

  • 0 in reply to KAZUHIKO KIMURA
    TI__Guru 54705 points

    Kazuhiko-san,

    Your about screen indicates that the GUI does not recognize that there is a board attached.

    Could you also please take a picture of the board (same side) as the one above.

    Fizix

  • 0 in reply to Fizix
    Prodigy 10 points

    Hello Fizix-san,

    I would like to share with you the reply I received directly from the Japanese distributor:

    - The Discovery 4100 Explorer has not been updated for a long time, and according to the company’s internal rules, due to security concerns, they are no longer allowed to run that software.
    - By checking the numbers on the seal of the PROM, no further information is required.

    I sincerely apologize, but I am caught in the middle between you and the Japanese distributor, and I honestly do not know what else I can do at this point. I am at a loss.

  • 0 in reply to KAZUHIKO KIMURA
    TI__Guru 54705 points

    Kazuhiko-san,

    I am sending you a friend invite so we can take this offline.  I think I can help you faster that way.

    Please tell me what OS you are running.

    Fizix