• State TI Thinks Resolved
  • Replies 3 replies
  • Answers 2 answers
  • Subscribers 63 subscribers
  • Views 53 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

TPS389006-Q1: Sync pin setting

Ted Xu
Expert 3635 points
Part Number: TPS389006-Q1
Other Parts Discussed in Thread: TPS389006,

Tool/software:

Hi BU team

What are the differences when tps389006-Q1 pin9 nSync is set high and low? Is it ok that connected sync pin between  multiple tps389006?

It is not clear in the datasheet description. 

Thanks 

  • 0
    TI__Expert 5510 points

    Hello Ted, 

    Yes the sync pin can be connected between multiple TPS389006s, the sync pin is an open drain pin. The Idea behind connecting multiple Sync pins together is it will allow you to keep a running log power up/ power down sequence of the rail being monitored. For example, say a voltage is applied to MON1 of Device One then that rail will be logged as sequence rail 1 and then a voltage is applied to MON1 of Device Two then this will be logged as sequence rail 2. Due to the sync pins being connected device two is able to recognize that device one has already logged a rail.

    Regards,

    Oscar Ambriz

  • 0 in reply to Oscar Ambriz
    TI__Expert 3635 points

    Hi Oscar

    Thanks for your comments.

    In the TAD4VH PDN-1A reference design released by EP team, there are the changes on tps389006004s' sync setting. Sync pins are of both tps389006004 pulled-up via a resistor in the old version while the sync pins are floating in the current version. EP BU said that the sequence logging function is not needed in their system. The question is if it is ok if customer keep sync pins are pulled-up in their system for their project will be soped and would not do more changes. 

    Thanks 

  • 0 in reply to Ted Xu
    TI__Expert 5510 points

    Hello Ted, 

    Having the pin floating does not have an impact on the monitoring capability of the device. If the customer would like to place a pull up that is also acceptable, the pull up is required for the sync pin to produce a signal as it is an open drain pin. 

    Regards, 

    Oscar Ambriz