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TUSB7320 - Device cannot be recognized after power up

Kawai
Guru 19785 points

Other Parts Discussed in Thread: TUSB7320

Hi Team,

Could you please help us to support TUSB7320 ?

Our customer is facing device recognition problem after powering up in Windows 8 embedded OS application.

When this issue is occurs, you cannot find the device in the device manager.

I am currently asking for their schematic and power up sequence.

Could you please give us advice, which point that we should check other than the above items ?

Customer mass production is scheduled in spring time frame.

We appreciate if we could have your help soon.

Best Regards,
Kawai

  • 0
    TI__Genius 11255 points

    Hello Kawai,

     The TUSB7320 disappears from the Device Manager or only the attached devices?

     Yes please provide us the schematic and power sequence.

     Could you ask them if the problem is present using our EVM? In case that they are able to use it on their system.   

    Also could you please request the issue’s reproduction process (step by step), we would like to try to reproduce it at our end using the EVM on a Windows 8 environment.

    Regards,

    Roberto.

  • 0 in reply to Roberto Diaz
    Guru 19785 points

    Hi Roberto-san,

    Thank you very much for your support.

    When I receive customer schematic and other information, I will let you know.

    As I need to share customer information, please let me discuss offline.

    Thanks and Best Regards,

    Kawai

  • 0 in reply to Kawai
    Guru 19785 points

    Hi Roberto-san,

    We are also asking customer to try to RESET the device when the issue occur.

    I understand one would need to toggle GRST# pin to LOW.

    How long would you need to hold GRST# to LOW for the device to reset?

    Best Regards,
    Kawai

  • 0 in reply to Kawai
    TI__Genius 11255 points

    Hello KAWAI,

     

    Sure please send the sensitive information  to my e-mail (robdiaz@ti.com ). 

    I think is better if they follow the Power-Down sequence, you can find it at the TUSB73x0 data manual sec 3.1.2 (http://www.ti.com/lit/ds/symlink/tusb7340.pdf )

    GRST# must remain asserted until both the 1.1-V and 3.3-V voltages have reached the minimum recommended operating voltage. If a 48 MHz reference clock is used instead of a crystal, GRST# must remain asserted until the 48 MHz clock is stable. 

    Also they can ensure that their implementation are following the Power-Up/-Down Sequencing, they can take a look to the TUSB73x0 data manual section 3  to 3.1.2 for more details bout the PERST# and GRST# behaviors.

    Regards,

    Roberto.

  • 0 in reply to Roberto Diaz
    Guru 19785 points

    Hi Roberto-san,

    Thank you for your support.

    Best Regards,
    Kawai