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SN65DP159: Inquiry About Signal Enhancement Configuration for SN65DP159

Tom Tsao
Expert 1850 points
Part Number: SN65DP159

Tool/software:

Dear TI Support Team,

I am currently working with the SN65DP159 and have a question regarding its signal enhancement features.

Specifically, I would like to know:

  1. Can the signal enhancements, such as equalization, de-emphasis, or gain control, be manually configured?
  2. If so, could you provide guidance or example settings for optimizing these features for different cable lengths or signal conditions?
  3. Are there any recommended register configurations for customizing these features when automatic mode is insufficient?

Thank you for your assistance. Any additional resources or application notes related to this topic would also be greatly appreciated.

  • +1
    TI__Mastermind 30130 points

    Hi Tom,

    1. Yes these can be manually set via pin strap or I2C modes. In pin strap mode, you can set EQ (equalization/gain control) using the EQ_SEL pin and DE (de-emphasis) using the PRE_SEL pin:

    In I2C mode you can set EQ using register 0x0A to set fixed EQ, then register 0x0D for the EQ value.

    You can set DE using register 0x0C (last two bits):

    2. You should set the EQ based on the channel loss from the video source. If you have a long cable or trace length between the source and the DP159, you would use a higher EQ value to compensate for the channel loss. A short trace length would use a lower EQ setting.

    DE is based on the channel loss from the DP159 to the HDMI connector. If you have a short PCB trace from the SN65DP159 to the connector, you may not need DE at all. If the channel is longer, I recommend using the -2dB setting.

    3. There isn't one standard configuration we recommend because the EQ/DE settings are application-specific. I suggest trying multiple EQ and DE values until you get the best performance out of your HDMI port.

    You can see the DP159 configuration guide app note for more info on setting EQ/DE values.

    Best,

    Shane