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TDP2004-Q1: application scenarios

Jiawei Hu1
Expert 6435 points

Part Number: TDP2004-Q1
Other Parts Discussed in Thread: TDP142,

Hi team,

BYD is considering to use DP redriver to drive Automotive display, the cable between DP source and sink is around 2m. From data sheet, I saw we can support cables. Here are some questions:

  1. We only have DP data input, but no AUX input. Doesn't Aux need redrive? I also saw TDP142 has AUX pin, but it's not Q grade.
  2. For TDP2004-Q1, do you recommend use I2C mode or pin mode for automotive display usage?

Thanks!

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  • 0
    TI__Guru**** 188591 points

    Hi,

    Please see my inserted response below.

    1. We only have DP data input, but no AUX input. Doesn't Aux need redrive? I also saw TDP142 has AUX pin, but it's not Q grade.
      1. AUX is a 1Mbps Manchester Encoding bus. With its low speed 1Mbps data rate, typically AUX re-driving is not needed since insertion loss at 1Mbps will be very low. TDP142 has AUX pins, but they are used for power management function, not for re-driving function.
    2. For TDP2004-Q1, do you recommend use I2C mode or pin mode for automotive display usage?
      1. I2C mode will require either an EEPROM (I2C Primary Mode) or an I2C controller (I2C secondary mode). Either EEPROM or I2C controller will be Q1 graded which adds additional cost. Pin mode only needs couple resistors. You can tune the TDP2004-Q1 in I2C mode secondary mode first, and then lock the same setting using pin mode.

    Thanks

    David

  • 0 in reply to David (ASIC) Liu
    TI__Expert 6435 points

    Hi David,

    Thanks for your reply.

    David (ASIC) Liu said:
      1. AUX is a 1Mbps Manchester Encoding bus. With its low speed 1Mbps data rate, typically AUX re-driving is not needed since insertion loss at 1Mbps will be very low. TDP142 has AUX pins, but they are used for power management function, not for re-driving function.

    BYD want to use this DP redriver to replace SerDes in the automotive display, so there is cables between DP source and DP sink. Based on your experience, how long cables between source and sink we can use when AUX doesn't redrive? Thanks!

    BR

    Jiawei

  • 0 in reply to Jiawei Hu1
    TI__Guru**** 188591 points

    Jiawei

    Depending on the required data rate, I would refer BYD to the specific DisplayPort specification, especially the section on the cable insertion loss spec. If their cable insertion loss is below the spec at the particular data rate across the frequency domain, then I would expect AUX to work with their cable.

    Thanks

    David