• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 33 subscribers
  • Views 446 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.

TPS65982: Using TPS65982 in DP ALT mode

guy lemire
Intellectual 970 points
Part Number: TPS65982

Hello,

we are using the TPS65982 in DP alt mode. We are configured as a DFP_D and we supply 5V @ 1.5A on VBUS.

We are observing an issue with the AUX+/- pins where we are not measuring the correct DC voltage on the pins and as such are failing compliance. As far as I understand the 65982 it has an internal 100k pullup to 3V3 on AUXN and a 100kpulldown on the AUXp.

My feeling is that we have the TI part configured incorrectly.

We are currently going trhough compliance and we are failing the AUX DC voltage which might indicate we are not pulling up/down the right RPU resistors in the AUX MUX.

Let me know what information I can send you to assist in the debug. Is there someone who is a DP Alt mode specialist that can assist.

Regards,

Guy

  • 0
    TI__Genius 10370 points

    Hi Guy,

    Sorry to hear you're having issues.  The TPS65982 does not have internal pull-up/pull-down resistors and I believe this is what's causing the issue. With a DFP_D configuration, please place a 100k pull-up resistor on AUX_N and a 100k pull-down resistor on AUX_P (look below for DP spec).

    I hope this helps and  f this answers your question, PLEASE select  This resolved my issue 

     

     

     

     

     

     

     

  • 0 in reply to Aramis P. Alvarez
    Intellectual 970 points

    Hi Aramis,

    this does resolve my question. I would advise a datasheet update is necessary as this is not explicitly stated, and in fact the datasheet seems to state that these pullups are internal.

    Please close this case.

    Regards,

    Guy

  • 0 in reply to guy lemire
    TI__Genius 10370 points

    Hi Guy,

    I will look into the datasheet to see if there's a discrepancy. Thank you for pointing this out. If this does resolve your question, may I ask you to could you PLEASE select  This resolved my issue  

    This will help us understand how to better support our e2e customers! Thank you so much for your question and choosing TI parts for your design :-)