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TMS320VC5416: About the Power Sequence

O.H
Genius 5340 points
Part Number: TMS320VC5416

Hi experts,

Are there any detailed specifications of the TMS320CV5416's power supply (rise slope, ripple voltage, power start-up sequence, etc.) that have been made public?

A customer of mine is having a problem with the TMS320CV5416 not starting up properly on a board he created.
This problem seems to occur frequently at temperatures above 20°C and humidity of about 80%. However, it seems to start normally at temperatures above 30°C and low humidity.

There have also been reports that the PLL does not work properly, and we are checking the details of the clock system.

First of all, I would like to check that the power sequence complies with the regulations.

Best regards,
O.H

  • 0
    TI__Guru* 78285 points

    Hello O.H-san

    All relevant design information for this product is what you see on the product folder. There is no additional/internal information beyond what you see in existing collateral on the product folder. 

    The product has been out there for several years and several customers are in production with this. 

    We are not able to provide deeper technical support for this device. 

    If this is an existing design and all of a sudden customer is seeing issues, they should see if something has changed in their software or hardware design. If they suspect the processor to be the issue, then they should conduct an swap test ( swap units from a known good board/good device, with the failing device/failing board), if the failure follow device, you can reach out to TI quality team for further assessment. 

    Regards

    Mukul

  • 0 in reply to Mukul Bhatnagar
    Genius 5340 points

    Hello Mukul,

    Thank you for your reply.

    I understood.

    Customer design information and other information is currently being checked.If we can't find any problems with this information, we would be happy to perform a swap test and, depending on the results, share them.

    Best regards,
    O.H

  • 0 in reply to O.H
    Genius 5340 points

    Hello Mukul,

    Please let me know if you know.

    What is the reason why the TRST pin has been changed in specification as shown in E2E below?
    https://e2e.ti.com/support/processors/f/791/t/259458?Pull-down-reason-of-470%CE%A9-recommended-TRST-pin-of-TMS320VC54

    When we checked the customer's design, the TRST pin was open. However, the latest datasheet states that the TRST pin needs to have a 470 ohm pull-down added. The customer wants to know the reason for the revision and it would be helpful to know.
    ※TMS320VC5416 Fixed-Point Digital Signal Processor datasheet (Rev. P)

    O.H said:
    Customer design information and other information is currently being checked.If we can't find any problems with this information, we would be happy to perform a swap test and, depending on the results, share them.

    It seems that heating up the board where this failure occurred will eliminate the symptoms. So, we cannot do a swap test because the problem is no longer caused by heating when removing the IC from the board.

    Best regards,
    O.H

  • 0 in reply to O.H
    TI__Guru* 78285 points

    Hello O.H 

    As per the older post, the response is the same - these are very old datasheets and the revision history shows the change was made in 2008. I will try to see if I can find anyone knowledgeable on the exact reasons for the changes, but I am not hopeful that we will be able to trace the exact reasons for the changes. Revision history does not archive the "reason" for the change. Original datasheet owners are no longer with TI.

    Given the datasheet, it would be good to see if there is any way to test that if TRST is indeed impacting the failure. It is important that customer does align to all recommendations on the latest/greatest datasheet as much as possible. 


    Regards

    Mukul 

  • 0 in reply to Mukul Bhatnagar
    Genius 5340 points

    Hello Mukul,

    Thank you for your support.

    Mukul Bhatnagar said:
    As per the older post, the response is the same - these are very old datasheets and the revision history shows the change was made in 2008. I will try to see if I can find anyone knowledgeable on the exact reasons for the changes, but I am not hopeful that we will be able to trace the exact reasons for the changes. Revision history does not archive the "reason" for the change. Original datasheet owners are no longer with TI.

    I understood.

    I would like to ask for confirmation that TRST pins are affected by this failure.

    Best regards,
    O.H

  • 0 in reply to O.H
    TI__Guru* 78285 points

    Hello

    >>I would like to ask for confirmation that TRST pins are affected by this failure.

    I believe TRST pins on older devices do have the tendency to cause failures like these. I do not have all the background on this as this is a very old device, but I would strongly recommend that you try the recommendations in the latest datasheets to see if it helps the failing scenario. 

    Regards

    Mukul 

  • 0 in reply to Mukul Bhatnagar
    Genius 5340 points

    Hello Mukul,

    Mukul Bhatnagar said:
    >>I would like to ask for confirmation that TRST pins are affected by this failure.

    Sorry.For the above sentence I meant "I'll ask my customer to check the impact of the TRST pin".

    Thank you for your insight.

    Best regards,
    O.H