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TPD12S521: TPD12S521DBTR || by default configuration without I2C TO ENBLE || HDMI ||

RAHUL RAI
Prodigy 35 points
Part Number: TPD12S521

HDMI_PDF.pdf

Hi Team,

We are using the HDMI TPD12S521DBTR in our design. I am unable to detect HDMI and 5V. Please see the attached schematic for reference.
  For communication, we are using NVidia jetson nxn processor  to TPD12S521DBTR.
Below is a query:: -
1. Does the TPD12S521DBTR IC  require configuration through I2C to enable the HDMI??
2. Is there any by-default configuration without i2c to detect the HDMI? (if it is possible, please share documents .)
I am looking for your positive response.
--
Thanks & Regards
RAHUL RAI
Sr. Hardware Engineer (R&D)
+919667738712 | rrai@iotechworld.com
IoTechWorld Avigation Pvt Ltd
Plot No. 31,34 Sector 35
Gurgaon, Haryana 122004
  • 0
    TI__Mastermind 26430 points

    Hi Rahul,

     The device does not need configuration.  It provides ESD and backdrive protection, but has no active of configurable circuitry

    Are you able to measure the 5V_OUT pin of the TPD12S521 with no HDMI connected.  This voltage should be at 5V as long as LV_SYPPLY is present.

    This is where to start with your debug and we can work from there.  HDMI won't connect without this voltage.

    Regards,

    Chuck

  • 0 in reply to Chuck Branch
    Prodigy 35 points

    Hi Chuck,

    I am getting 5V_OUT With respect to  LV_SYPPLY = 1.8V without connecting HDMI.

    below is logs with and without hdmi  same

    1.541655] tegradc 15200000.nvdisplay: disp0 connected to head0->/host1x/sor1
    [ 1.541772] tegradc 15200000.nvdisplay: DT parsed successfully
    [ 1.541811] tegradc 15200000.nvdisplay: Display dc. (ptrval) registered with id=0
    [ 1.545919] tegradc 15200000.nvdisplay: vblank syncpt # 8 for dc 0
    [ 1.545928] tegradc 15200000.nvdisplay: vpulse3 syncpt # 9 for dc 0
    [ 1.548745] tegradc 15200000.nvdisplay: hdmi: invalid prod list prod_list_hdmi_board
    [ 1.548755] tegradc 15200000.nvdisplay: hdmi: tegra_hdmi_tmds_range_read(bd) failed
    [ 1.552295] tegradc 15200000.nvdisplay: probed
    [ 1.553020] tegradc 15200000.nvdisplay: fb registered
    [ 1.553647] tegradc 15210000.nvdisplay: disp1 connected to head1->/host1x/sor
    [ 1.553676] tegradc 15210000.nvdisplay: parse_dp_settings: No dp-lt-settings node
    [ 1.553742] tegradc 15210000.nvdisplay: DT parsed successfully
    [ 1.553772] tegradc 15210000.nvdisplay: Display dc. (ptrval) registered with id=1
    [ 1.553920] tegradc 15210000.nvdisplay: vblank syncpt # 11 for dc 1
    [ 1.553929] tegradc 15210000.nvdisplay: vpulse3 syncpt # 12 for dc 1
    [ 1.563505] tegradc 15210000.nvdisplay: probed
    [ 1.563839] tegradc 15210000.nvdisplay: fb registered
    [ 1.567431] tegradc 15210000.nvdisplay: blank - powerdown
    [ 13.349534] tegradc 15200000.nvdisplay: blank - powerdown
    [ 13.349552] tegradc 15210000.nvdisplay: blank - powerdown

  • 0 in reply to RAHUL RAI
    TI__Mastermind 26430 points

    Rahul,

    The 5V output is a simple regulator that has a built in current limit.  There is no disable switch function.  If there is 5V on 5V_SUPPLY then there will be 5V on 5V_OUT with a dropout of 150-200mV.  This path has a current limit of 55mA to meet the HDMI SPEC, but does not have a disable function.

    The TPD12S521 is a pass through ESD device.with integrated level shifting.  There is no controlled function on the device.

    I did look further at your schematic and there is a missing pull-up and DIODE

    Please review this BOM requirement because it is likely the cause of your issue.

    Regards,

    Chuck

  • 0 in reply to Chuck Branch
    Prodigy 35 points

    Chuck ,

    I have tired with pull-up and schottky diode configuration. Still I am not able  to detect HDMI. 

    Same logs are coming.

  • 0 in reply to RAHUL RAI
    TI__Mastermind 26430 points

    I'll wait for the logs to see how best to proceed with debug.

  • 0 in reply to Chuck Branch
    Prodigy 35 points

    which logs???

  • 0 in reply to RAHUL RAI
    TI__Mastermind 38695 points

    Hello Rahul,

    1. The datasheet shows a 27k resistor pull up to 3V3 on CEC_OUT, but I see a 1.69k pull up to 5V on your schematic.
    2. R108, R103, and R105 should be 47k resistors.
    3. R107 should be a 100k resistor.

    Please update your BOM as recommended by Chuck. 

    BR,

    Seong