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TPD12S520: HDMI receiver protector

Part Number: TPD12S520
Other Parts Discussed in Thread: TPD5S116, TPD4E02B04

Hello,

My customer has the below query;

I have been asked to check the different solutions technically and quickly draw up some schematics

I have some questions about the TPD12S520 part. It describes itself as a level shifter, but there is no information on the Vin/out_hi/lo levels for the DDC_DAT and DDC_CLK (I2C) lines

Also the diagram for these seems to suggest that the ‘level shifting’ is just a primitive pass FET-based headroom clamp that increases impedance for 5V signals:

 

 PLEASE SEE FUNC DIAGRAM 7.2 page 7 of data sheet

 

Is this true? What we really need for these lines is a strong I2C cable driver that can input weedy I2C signals with quite high-ish Vout_lo levels where ‘lo’ could be as high as 0.9V(!),

and strongly redrive cable loads up to 750pF with a good low signal much closer to 0V. Can this TPD12S520 chip do this?

 

If not, what do you suggest for an HDMI receive protector? We want something that has strong drive, but don’t need any 5V power switches or regulators because we are a reciever, not a transmitter

 

Can you help confirm TPD12S520 suitability or recommend alternative?

 

Thank you in advance

Linda