• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 32 subscribers
  • Views 599 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.

TUSB2036 connecting together PWRON[1:3] pins

Sunder Raj
Prodigy 20 points
Other Parts Discussed in Thread: TPS2014

The data sheet says the PWRON[1..3] pins are push-pull type. However the reference schematic on page#16 (application info self powered hub, ganged-port management) shows them connected together. How can this be allowed unless these are open drain outputs?

 

Am I missing something?

 

Thank you,

Sunder

  • 0
    TI__Guru* 76130 points

    Hello Sunder,

     

    We appreciate your comments, you are correct, the ~PWRON signals should not be tied together.

    The application notes from data sheet are just  for reference and they are not meant to show any specific implementation.

    The figure you are referring to is meant to show only the ~OVRCUR connection in ganged mode, if you take a close look, it only mention "...The OVRCUR signals must be tied together for a ganged operation..."

    It is not the purpose of the figure to represent any other implementation.

     

    Regards.

  • 0 in reply to Elias Villegas M.
    Prodigy 20 points

    Thank you for your prompt reply.

    I have two downstream ports in the design, I want to use a single current switch for both the ports for cost reasons.

    So if I want to use a single external current switch (TPS2014 or similar) for two ports, how do I connect PWRON and OVRCUR signals? Is it OK to use just PWRON1 and OVRCUR1 for this external switch? (and leave the PWRON[2..3] unconnected?

    Regards

    Sunder

  • 0 in reply to Sunder Raj
    TI__Guru* 76130 points

    That is correct, only if you configure the hub in GANGED mode.

     

    You need to tie all OVRCUR together and all TPSx's OC outputs together, also you need a 15K pull-up to 3.3V on the OVRCUR connection to prevent them from floating.

    You can use just  PWRON[1] output and leave [2:3] floating, keep in mind that you need to tie together all TPSx's EN inputs together.

    Use the below figure as reference.

    Regards.