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TPS65987D: Video support issue/question.

Aleksey Starovoytov
Intellectual 400 points
Part Number: TPS65987D
Other Parts Discussed in Thread: SN65DSI86

We made a device based on TPS65987D for USB-C PD and AltModes. 
This devise support a lot of different USB-C enabled devices for power and video input.
Recently we have tested iPhone with a Lightning connector via Lightning to USB-C cable and got it working for receiving a power.
We were expecting it to do anything with video, but it did not.
The question is, is there a mode of Lightning, like USB-C that it may output any kind of video direct, like two lines DisplayPort, or it requires a little video card dongle to do it?

Thanks.

  • 0
    TI__Mastermind 30000 points

    Hi Aleksey,

    How are you connecting the data lines from the Type-C connector on your system? Are you expecting the data to come from the DP/DM lines or the SSRX/SSTX?

  • 0 in reply to Adam Mc Gaffin
    Intellectual 400 points

    Hi Adam,

    Well, DP/DM lines are USB 2.0 dedicated lines in USB-C connector, and it is not used for high speed or video, correct?
    So, what I was thinking, there is a mode where DisplayPort uses only two differential lines, and because Lightning connector have two differential data lines, may it be used for video?
    But, then how would you connect those SBU/AUX for EDID table and so...? 

    Aleksey

  • 0 in reply to Aleksey Starovoytov
    TI__Mastermind 30000 points

    Hi Aleksey,

    That is correct and I agree with your logic, but there is no way to know for certain since it is a proprietary connection. One way to know for certain is to check the continuity between the SSRX/SSTX connections on your board to the unconnected pins on the cable. This well help isolate if the SSRX/TX lines are used, and if they're even connected at all. (not sure if you are using a Apple certified cable or not)

    As far as the SBU/AUX for EDID table I'm not 100% sure. Maybe you would use a device like the following? From the PD controller perspective, if another Type-C PD device is connected, we would negotiate a displayport connection, and toggle HPD and an external mux accordingly. However, since this is a lightning to type-c, I'm not sure a PD contract would be negotiated so I'm not sure how the data would be passed down stream.

    http://www.ti.com/product/SN65DSI86

    My recommendation is to post a question on the forums for the SN65DSI86 and see if they have any suggestions.