Filters for HDMI Interface

[gauravmjoshi]

Hello Everyone,

First of all, I am not sure if this thread has been created under the right section, if not, kindly guide me to the same.

I am interfacing HDMI Connectors with an Arm Cortex A series microprocessor for use in Industrial HMI Controller environment.

I would be using HDMI 2.0 or 2.1 data transfer rates.

I plan to use a HDMI companion chip such as the HDMI2C4-5F2 as a signal booster, ESD protection and level shifting of SCL, SDA, HPD, CEC & Enable pins. It also has a ESD diode for the VCC pin.

I would like to use some filters between the ESD diode and the microprocessor for better immunity from noisy industrial environment.

Circuit would typically be as :
Connector ----> ESD Diodes ----> Filters ----> Microprocessor HDMI pins.
(ESD Diodes and Filters shall be typically placed close to the connectors).

For the TDMS pairs, I would use 2 nos. of ECM4-2450A17M10 which has a ESD and common mode filter integrated in it.

However, I wish to know, what kind of filters are required for SCL, SDA, HPD, Enable and VCC pins.

Can you please recommend me some part numbers for the same.



Regards,

Gaurav

 

[FvM]

HDMI2C4-5F2 is already repeating the control signals. I don't see a purpose for filters towards uC, presumed all components are sitting on a continuous ground plane.

 

[gauravmjoshi]

What if I use a filter such as NUF6401MN between the connector and the HDMI2C4-5F2 for the SDA, SCL, CEC, HPD and VCC pins.
As such if we refer to the datasheet of HDMI2C4-5F2, we find that only SDA, SCL & HPD are having level shifting and ESD diodes, whereas CEC & VCC are having only ESD diodes.
I was thinking that by using filter similar to NUF6401MN / TPD6F002, we can have some kind of filter ( a PI filter ) for better noise immunity.

And as such since, the IC has 6 filters, I was thinking of using it for all the remaining ( SCL, SDA, CEC, HPD, VCC ) pins as well.

Regards,
Gaurav

 

[KlausST]

Hi,

VCC should be bypassed with large enough and fast enough capacitors ... thus I see no need for extra ESD protection.

Klaus