• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 31 subscribers
  • Views 836 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

DP141RLJEVM: Power Source Question

Kostas Papouis
Prodigy 220 points
Part Number: DP141RLJEVM

Hi, 

 I have been reading the DP141RLJ Evaluation Module documentation(www.ti.com/.../sllu242.pdf) and i have a question regarding to the DP_PWR signal. 

Page 3 states the following: The DP power can be passed through from the DP input connected via J9 or tied directly to 3P3V on the board.

Checking the pinout of a standard Display port cable(shown below) it shows that Pin 20(DP_PWR) at each end of the cable, expects to be powered by its respective connector. Also it shows that the pin 20 of the one end of the cable is NOT internally connected to the pin 20 of the other end of the cable.


My question is why on the Evaluation Module documentation states that power can be passed through from the DP input connected via J9?
In addition, is there a need to provide 3.3V to Pin 20 of the two Display Port connectors since they are not internally connected? 


Thank you very much!!

Best Regards,
Kostas

  • 0
    TI__Mastermind 23815 points
    Hi Kostas,

    A standard DP cable must have no wire for the DP_PWR pin.
    Only captive cables supplied with cable powered Branch devices or cables permanently attached to downstream devices or resizing adaptors or extension cables are permitted to have the wire for DP_PWR. These captive/attached/resizing/extension cables must have a full-size or mDP plug connector (as specified in Section 4.2.1) on one end only. The other end must either be permanently attached or have a DP receptacle connector or a custom connector.

    So, this pin can be used to power repeaters, protocol converters or level shifters.

    Regards