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TMDS442 Check of circuit connection
Part Number: TMDS442
Hello team,My customer has a question about I2C pull-up resisters values of TMDS442.The following E2E forum, "SCL/SDA(source side) should have 47k pullups, SCL_SINK/SDA_SINK should have 6k pullups" was written.https://e2e.ti.com/support/interface/f/138/t/555602?TMDS442-Check-of-circuit-connection Would you tell me how constant values(47k and 6k) are determined? Please advise.Best Regards,Akihisa Tamazaki
This is defined by the HDMI spec. The spec defines a 1.5k min and 2k max pullup resistor for Source SCL and SDA, and 47K +/-10% pullup resistor for Sink SCL and SDA. I believe the 6k is a typo.
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In reply to David (ASIC) Liu:
Thank you for your comment.The customer requested us to show where in HDMI specification 1.5k min and 2k max pullup resistor for Source SCL and SDA, and 47K +/-10% is written. Because the customer do not know whether 6kohms is typo or not.Would you please advise?Best Regards,Akihisa Tamazaki
In reply to Akihisa Tamazaki:
Please refer to section 4.2.8 of the HDMI spec 1.4b.
David-san,Thank you for your kind support. It is so helpful.
Best Regards,Akihisa Tamazaki
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