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TUSB212-Q1: Short VCC Drop and Reset Operation

Kenichiro
Mastermind 9165 points
Part Number: TUSB212-Q1
Other Parts Discussed in Thread: TUSB212

[ TUSB212-Q1 ] Short VCC Drop and Reset Operation

Hi,

If VCC supply for TUSB212-Q1 drops suddenly, is it recommended to have power on reset or toggling RSTN pin?
(I'm sorry that I don't have details of this short drop.)



If customer attempts to perform the device reset by power cycloing (off and on again), what is the the threshold of VCC low and minimum low duration?

Thank you for your support in advance.
Regards,
Ken





  • 0
    TI__Guru**** 154171 points
    Ken-san

    RSTn pin needs to be hold low until VCC reaches VCC(min) level, please refer to Figure 1 in the TUSB212 data sheet.

    Thanks
    David
  • 0 in reply to David (ASIC) Liu
    Mastermind 9165 points

    Hi David,

    Are there any requirements on minimum Vcc-low period?

    What I try to suggest customer is that power cycling (off and on again) after occuring the unstable of Vcc supply. (and follow RSTN sequence as stated in the datasheet.)



    Thus, it's helpful if you have a number of lower thereshold of VCC and minimum duration.
    Does this make sense?

    Thank you for your support in advance.
    Regards,
    Ken

  • 0 in reply to Kenichiro
    TI__Guru**** 154171 points

    Ken-san

    There is no min duration, once TUSB212 drops below certain voltage threshold, it will consider to be off, but I do not have this threshold voltage number.

    Why not use RESET pin to do the reset function?

    As long as TUSB212 is hold in reset while supply is unstable, and release reset after VCC is stable, this should not be an issue.

    Thanks

    David