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SN65DP159: About Signal Monitor Functions

user5163865
Genius 3980 points
Part Number: SN65DP159

Tool/software:

Hi,

1. Does the SN65DP159RSBR have a function to monitor the status (DC level, etc.) of the HDMI output signal (HDMI_CLK or HDMI_Dx) other than the status of the HPD_SNK input and stop the HDMI output signal?

2. This is a similar question to 1, but what exactly does the signal detector circuit result in "When HPD asserts, the device CDR and output will enable based on the signal detector circuit result" in chapter 11.1 Power Management of the datasheet do?

Best regards,

Hiroshi

  • 0
    Genius 3980 points

    Sorry, our customer have an additional question.

    3. During input power momentary power interruption testing, we are experiencing a problem where the re-timer does not start properly.
    When the power is interrupted momentarily, the following occurs.

     - VDD1-4 (1.1V system) drop to almost 0V → then return to 1.1V.
    - VCC1,2,I2C_EN (3.3V system) voltage remains at 1V → then return to 3.3V.
    - OE is left OPEN and connected to 0.1uF.

    After reaching the above state, it cannot return to normal (why?

    It can return to normal when 3.3V drops to 0V, so I think it's because the internal circuitry has not completely self-reset when 1V remains, is this understanding correct?

    Best regards,
    Hiroshi

  • +1 in reply to user5163865
    TI__Mastermind 40040 points
    user5163865 said:
    1. Does the SN65DP159RSBR have a function to monitor the status (DC level, etc.) of the HDMI output signal (HDMI_CLK or HDMI_Dx) other than the status of the HPD_SNK input and stop the HDMI output signal?

    No this device does not have a function to monitor the TX out

    user5163865 said:
    2. This is a similar question to 1, but what exactly does the signal detector circuit result in "When HPD asserts, the device CDR and output will enable based on the signal detector circuit result" in chapter 11.1 Power Management of the datasheet do?

    This is an internal signal detection circuit which is based of the PLL status in the retimer

    user5163865 said:
    3. During input power momentary power interruption testing, we are experiencing a problem where the re-timer does not start properly.
    When the power is interrupted momentarily, the following occurs.

    In this power stage we see that the the VCC is never fully set to 0V it is held at 1V. This means that the voltage level seen at OE is higher than the VIL threshold and thus the device is never fully reset as the OE is tied to VCC. This places the device into an unknown state.