• State Resolved
  • Locked Locked
  • Replies 10 replies
  • Answers 1 answer
  • Subscribers 62 subscribers
  • Views 169 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.

Original question:

TUSB1064: TUSB1064: AUX signal eye diagram was decreased due to TUSB1064

TUSB1064: how to control HPD of TUSB1064

jianxi.cao
Prodigy 90 points
Part Number: TUSB1064

Dear E2E teams,

i use TUSB1064 for Typec to DP project.

TUSB1064 and DP receicer IC is on one board, so there is not DP Hot plug.

i pull up HPD of TUSB1064 with 4.7K all the time, is this OK?

thanks!

  • 0
    TI__Guru**** 152496 points

    Hi,

    You can force the HPD high by pulling it to 3.3V through a 4.7k resistor. But why are you saying "TUSB1064 and DP receicer IC is on one board, so there is not DP Hot plug"? 

    The HPD also needs to be connected to a PD controller, please check on how to implement this if there is no HPD from the DP receiver.

    Thanks

    David

  • 0 in reply to David (ASIC) Liu
    Prodigy 90 points

    hi David,

    Thanks for your quick reply.

    "TUSB1064 and DP receiver IC is on one board" means TUSB1064 and DP receiver is on the same board, i pull up HPDIN of TUSB1064 and HPD of DP receiver IC, the HPDIN of TUSB1064 will be high from power on,there will be no change from low to high when DP is inserted.

    By the way, why HPD of TUSB1064 also needs to be connected to a PD controller, will PD controller send the DP plug in  information to source by CC?

    thanks.

  • 0 in reply to jianxi.cao
    TI__Guru**** 152496 points

    Hi,

    For TUSB1064, it uses HPD as a power management feature. When HPD is low, it will go into low power mode. If you have the HPD always pulled high, then TUSB1064 will not go into low power mode.

    HPD connected to the PD controller, and the PD controller communicates HPD to the source by the CC lines. In this case, HPD indicates disconnect/connect and HPD interrupt. If you have the HPD of the DP receiver always pulled high, then the source will see the DP receiver always being connected. But you will not able to send HPD interrupt to the source anymore since HPD is always being pulled high.

    Thanks

    David

  • 0 in reply to David (ASIC) Liu
    Prodigy 90 points

    hi David

    Does it means PD controller should detcet the HPD and communicates with DP source(such as Notebook)  by CC lines, until DP source gets HPD information and begin to send DP data stream?

  • 0 in reply to jianxi.cao
    TI__Guru**** 152496 points

    Hi,

    Does it means PD controller should detcet the HPD and communicates with DP source(such as Notebook)  by CC lines, until DP source gets HPD information and begin to send DP data stream?

    Yes, once DP source detects HPD, it will being DP link training, and once link training is successful, it will send the DP data stream.

    Thanks

    David

  • +1 in reply to David (ASIC) Liu
    Prodigy 90 points

    Dear David,

    Thank you very much.

    Let me summarize my understanding, Please check if it is correct.

    1. TUSB1064 is used for TypeC to DP in my project

    2. HPD of TUSB1064 can be pull up with 4.7K all the time.

    3. HPD of TUSB1064 is a power management feature. When HPD is low, it will go into low power mode.

    4.  PD controller detect HPD, when HPD is high, PD controller will send the infomation of DP sink plug in to DP source(Notebook) via CC lines, and request DP source begin DP link training and data stream. I mistakenly thought that AUX was used to detect DP sink plug in.

    thank you again.

  • 0 in reply to jianxi.cao
    TI__Guru**** 152496 points

    Hi,

    Please see my inserted comments. 

    1. TUSB1064 is used for Type-C to DP in my project

    2. HPD of TUSB1064 can be pull up with 4.7K all the time.

    3. HPD of TUSB1064 is a power management feature. When HPD is low, it will go into low power mode. -> Correct

    4.  PD controller detect HPD from the sink, when HPD is high, PD controller will send the information of DP sink plug in to DP source(Notebook) via CC lines, and request DP source begin DP link training and data stream. I mistakenly thought that AUX was used to detect DP sink plug in.

    PD does not request DP source beginning link training. DP source will automatically start the link training once it see the HPD going high. The DP sink uses the AUX to detect the connection of a powered or an unpowered source. Source uses HPD to detect the sink connection.

    Sink will also toggle HPD (HPD_Interrupt) to notify any issue to the source. The HPD_Interrupt will also go across the CC using the PD controller.

    Thanks

    David

  • 0 in reply to David (ASIC) Liu
    Prodigy 90 points

    hi David

    thanks for your reply.

    TUSB1064 and DP receive IC has worked fine currently. The monitor is showing normally.

    I think i need your support for  another question ,below is my hardware block diagram.

    TUSB1064 is configured as “USB3.1+2Lane DP” Mode.

    when i connect monitor, Notebook can't Identify the device(USB3014)

    when i remove monitor,Notebook can Identify the device(USB3014)

    typeC socket stays still.

    would you like to give some advice?

  • 0 in reply to jianxi.cao
    TI__Guru**** 152496 points

    Hi,

    Please see my response to the other e2e thread on this issue, https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1269047/tusb1064-output-of-tusb1064. Let's close this one and use the other e2e thread to solve the USB issue.

    Can you also share your schematic?

    Thanks

    David

  • 0 in reply to David (ASIC) Liu
    Prodigy 90 points

    hi  David

    OK, thank you!

    we can close this one.