• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 62 subscribers
  • Views 663 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS3890: looking for a 60s reset IC with Manual reset funtion

Ben Kuo
Expert 7570 points
Part Number: TPS3890
Other Parts Discussed in Thread: TPS3898, TPS3896

Dear Experts,

I am looking for a reset IC can do below function.

*used to force down powerbox when the button is pressed 60 sec*

Any recommend?

Thanks!

Ben

  • 0
    TI__Genius 12630 points
    Ben,

    I want to choose the correct part. Do you mean "power down when button is pressed for 60 seconds meaning the button must be low for the whole 60 seconds" or "power down after 60 seconds when button is pressed (and button press can be any length)"

    The difference is whether the button needs to be held down for 60 seconds or if you simply want a 60 second delay after the button is pressed for any length of time.

    -Michael
  • 0 in reply to Michael_DeSando
    TI__Expert 7570 points

    Hi Michael,

    Thanks for your reply. I am looking for "power down after 60 seconds when button is pressed“

    Did we have suitable device can do this application?

    -Ben

  • 0 in reply to Ben Kuo
    TI__Genius 12630 points

    Ben,

    In that case, TPS3896 (push-pull output topology) or TPS3898 (open-drain output topology) will work by setting the delay to 60s using an external capacitor following the equation: tpd(r) (s) = [CCT (µF) × 4] + 40 µs

    You can use the ENABLE pin connected to external button to trigger the reset.

     http://www.ti.com/lit/ds/symlink/tps3896.pdf

    Please let me know if any additional support is needed. Thank you!

    -Michael