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SN65DP159

Bob Sachse
Prodigy 80 points
Other Parts Discussed in Thread: TMDS181, SN65DP159, TUSB3410

I am currently designing a port replicator PCB for a customer that has USB3.0 and HDMI signals coming from the tablet via pogo pin docking connector. I have never done a design that required an HDMI port. What I am looking for is a BOM for the schematic that is on page 43 of the data sheet Figure 31. his BOM should show values and sizes of the various components (capacitors and resistors). Thanks.

  • 0
    TI__Guru 60865 points
    Hi Bob,

    The EVM Users Guides for both DP159 packages have schematics and BOMs with footprint info.

    www.ti.com/.../toolssoftware

    Regards,
    JMMN
  • 0 in reply to JMMN
    Prodigy 80 points

    I am having an issue understanding what needs to be done. On EVM schematic (DP159RGZ) on page one it has the following note: "Pop 0 ohm series on IN_Dxx lines for DP159 thru HDMI. No pop 0 ohm series on IN_Dxx lines for DP159. What is meant by lines for DP159 thru HDMI and lines for DP159? Thanks.

  • 0 in reply to Bob Sachse
    TI__Mastermind 23815 points
    Hi Bob

    Could you please provide a snapshot of such note, and nearby devices.
    I Don't see that same note on the documents I have.

    Regards
  • 0 in reply to Bob Sachse
    TI__Guru 60865 points
    Hi Bob,

    The DP159RGZ EVM has the ability to connect to a DP source or a HDMI source depending on how it is configured. The DP159 is designed for a dual mode DP input (regular DP159 mode), but it can tolerate a HDMI input using external pullup resistors along with the capacitors (DP159 thru HDMI mode). Does that clarify the notes?

    Regards,
    JMMN
  • 0 in reply to JMMN
    Prodigy 80 points

    Yes I believe it does. I am assuming that because the signals are coming from a tablet computer via pogo pins used to transfer the signals to the port replicator board then  I should consider this to be HDMI input. Do you agree? Thanks again. 

  • 0 in reply to Bob Sachse
    Prodigy 80 points
    Can you please explain the difference between DDC on and DDC snoop only? Thanks.
  • 0 in reply to Bob Sachse
    TI__Guru 60865 points
    Hi Bob,

    If you have an HDMI input, I would strongly recommend using the TMDS181 device. It is similar to the DP159 but designed for HDMI inputs.

    Regards,
    JMMN
  • 0 in reply to Bob Sachse
    TI__Guru 60865 points
    The DP159 is able to act as a slave to the source and master to the sink on the I2C bus. This allows the DP159 to report its Adapter ID if it is used as a DP to HDMI dual mode adapter, and also provide 5V to 3.3V level shifting. In addition, the DP159 snoops the DDC bus looking for any changes to the clock ratio to indicate traffic above 3.4 Gbps. One downside is that the DP159 implements I2C clock stretching while it is waiting on sink responses, and not all sources tolerate this. To workaround this, customers can implement the DDC snoop only mode which allows the DP159 to still look for any changes to the clock ratio bit, but does not allow for level shifting or reporting of the Adapter ID.
  • 0 in reply to JMMN
    Prodigy 80 points

    Thanks for the advice JMMN. The input is coming from a docking connector that attaches to a tablet computer so I am assuming that the signals coming from the tablet via the docking connector are the same as those that would be coming from a HDMI connector that would be located on the tablet itself. That being said why would the TMDS181i be a better choice over the SN65DP159 device? The other question that I have what is the purpose of using TUSB3410 isn't this a USB to serial port device which would not be necessary for my design.? Thanks.

  • 0 in reply to Bob Sachse
    TI__Guru 60865 points

    The TMDS181 device is designed for a standard HDMI input.  The SN65DP159 is designed for a AC coupled dual mode DP input, not a HDMI input.  You are right, the TUSB3410 would not be used in an actual application.  It is just used on the EVM to provide USB to UART conversion so that a TI-provided GUI can be used to read / write registers.

    Regards,

    JMMN

  • 0 in reply to JMMN
    Prodigy 80 points

    Thanks JMMN this was helpful. I am looking at the TMDS181 RGZ Evaluation Module (EVM Schematic) shows on page 1 that R125 R126 are connected to the SCL_SCR signal. I think this is in error and that one of those resistors should be connected to the SDA_SCR signal. don't make since to have the same line tied to ground twice. Correct? Thanks.

    ev

  • 0 in reply to Bob Sachse
    TI__Guru 60865 points

    Yes, that is a typo.  R126 should be SCL_SRC to ground and R125 should be SDA_SRC to ground.

    Thansk,

    JMMN

  • 0 in reply to JMMN
    Prodigy 80 points

    Thanks JMMN for the confirmation on the typo. How can I submit the schematic for a design review by TI? I have it available in a pdf format. I did decided to use the TMDS181iRGZ device instead of the SN65DP159 as you recommended. Thanks.