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DLPA3005: INT_Z failure?

Uryyy
Expert 1890 points
Part Number: DLPA3005
Other Parts Discussed in Thread: DLP4710, DLPC3479,

Hello,

We are trying running test for DLPC3479/DLP4710/DLPA3005 custom system. However, the system sometimes stops. The phenomenon is I2C communication is not possible and we found DLPA3005 INT_Z = Low. We can not confirm the detail of DLPA failure as interrupt register because I2C can not communicate DLPC. Do you have any comments of experiences for DLPA INT_Z failure? We would like to know someting of clue.

Regards,

Uryyy

  • 0
    TI__Expert 3360 points

    Hi Uryyy - a few questions to help troubleshoot,

    1. Do you mind providing more information on the system before and after it stops working ?

    2. What happened between the system working and failing ?

    3. Was the failing system in question ever operational ?

    4. If so, what was being done with the system when it failed ?

    Thank you,

    Chris

  • 0 in reply to Cody Smith
    Expert 1890 points

    Hi Chris,

    I understand the system is DLP4710 projector. Other systems are not affected by this problem.

    1. The projector works fine before the problem and stops after the problem. When it restarted(PROJ_ON=LOW->HIGH), the projector works fine.

    2. I'm not sure it because I found the problems after the 10hours running test which displays continuous patterns.

    The phenomenons are

    - Display stops

    - I2C communication is not possible

    - DLPA3005 INT_Z = Low

    3. Yes

    4. As #2 mentioned, I did the running test.

    Regards,

    Uryyy

  • +1 in reply to Uryyy
    TI__Expert 3360 points

    Does the system turn off after an i2c command is sent ?

  • 0 in reply to Cody Smith
    Expert 1890 points

    Hi Chriss

    Sorry for my miss operation as "Resolved".

    My test application executes continuous I2C access because the patterns are changed and displayed.

    Regards,

    Uryyy

  • 0 in reply to Uryyy
    TI__Mastermind 28005 points

    Uryyy,

    How hot is your system running when the system fails? The DLPA3005 has a high-temperature warning interrupt which causes the system to shut down.

    You may also want to monitor power rails during the failure event. Let us know what you find.

    Regards,

    Philippe

  • 0 in reply to Philippe Dollo
    TI__Mastermind 28005 points

    Uryyy,

    Do you have any updates on this issue? For now, I would suggest that you verify the thermals of your system in the case that you have an issue with your system overheating (this will cause a PAD interrupt that shuts the system down).

    Regards,

    Philippe

  • 0 in reply to Philippe Dollo
    Expert 1890 points

    Hi Philippe,

    Thank you for your comment. The temperature is 40℃ around the system. If a DLPA(PAD) has interrupt, are there cases of DLPC freeze(not communicate via I2C)?

    Regards,

    Uryyy

  • 0 in reply to Uryyy
    TI__Mastermind 20665 points

    Hi Uryyy,

    It appears that for this chipset the following innterupts are unmasked (able to pull INTZ low)

    TS_SHUT - over temperature

    BAT_LOW_SHUT - low battery 

    DMD_FAULT - DMD issue

    ILLUM_FAULT - likely cause by disconnected LEDs

    You can read in the DLPA3005 datasheet for what may be causing these, and investigate on your system.

    Regards,

    Arthur

  • 0 in reply to Arthur Brown
    Expert 1890 points

    Hi Arthur,

    I paid attention the DMD_FAULT, then tried the experiment of DMD disconnection while the projector was running. As a result, DLPA didn't have the interrupt and DLPC looks like normal work. I'm confusing why DLPA doesn't detect the fail. Do you have something of comments regarding this issue?

    Regards,

    Uryyy

  • 0 in reply to Uryyy
    TI__Mastermind 28005 points

    Uryyy,

    The DMD fault is not tied to the DMD itself being disconnected. I would note that disconnecting the DMD during operation is very likely to damage the DMD.

    What do your power supplies look like during operation? Are they dipping low enough to trigger the UVLO?

    Regards,

    Philippe