• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 33 subscribers
  • Views 280 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.

TPS65981: Reduced PD functionality

Till Hagemann
Prodigy 100 points
Part Number: TPS65981

Hello Ti Team,

I want to use the TPS65981 in my USB Type C design. I have a question referring to the PD functionality of the device. I want to provide two voltages over the internal power mux to the Type C connector. The external power path will be leave unconnected. The voltages are:

+ 5V/ 3A

+12V/3A

Q1: Does I understand right, that the 5V/3A will served over the PP_5V0  pin to the VBUS? Or will the 5V/3A provide by the PP_HV pin?

Q2: How should I handle the Sense/Gate Pins without the external power path?

Q3: Is it possible to provide only 12V to the PP_HV pin? Must I configure the device I just in the right way?

Q4: How accurate must be the voltage, that It will be detected as PD standard voltage?

Thank you very much in advance for your answer.

Yours faithfully,

Till Hagemann

  • 0
    TI__Genius 10370 points

    Hi Till,

    Welcome to e2e! Just an FYI,  only 5V/3A, 9V/3A, 15V/3A, and 20V/5A are allowed voltage capabilities in order to comply with USB-PD specs.  With that being said, look below for my comments/feedback in red:

    Q1: Does I understand right, that the 5V/3A will serve over the PP_5V0  pin to the VBUS? Or will the 5V/3A provide by the PP_HV pin?

    Please download the Customization Tool GUI. With the GUI, one can set the 5V/3A path to either PP_5V0 or PP_HV. Most customers use the 5V/3A path set at PP_5V0. You can find the Customization tool here (TPS6598x-Tool): http://www.ti.com/tool/tps6598x-config. 

    Q2: How should I handle the Sense/Gate Pins without the external power path?

    Please refer to the Electrical Characteristics section of the TPS65981 datasheet.

    Q3: Is it possible to provide only 12V to the PP_HV pin? Must I configure the device I just in the right way?

    The TPS65981EVM can only source 5V, 9V, 15V, and 20V (not 12V). 12V is not  USB-PD compliant.

    Q4: How accurate must be the voltage, that It will be detected as PD standard voltage?

    Please refer to the USB-PD specs on usb.org ==> click on "Developers" ==> Click on "Documents" ==> Then click on "Universal Serial Bus Revision 3.2 Specification".  In short, after 275ms VBUS transition, you're allowed to go +/- 5% of set PD voltage. The exception is the 5V spec, which has a range of 4.75V - 5.5V. 

     

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