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Channel Link III and ESD protection

Bradley Helsel
Intellectual 260 points
Other Parts Discussed in Thread: TPD6E001

What is the best way to protect the LVDS pair from ESD? I currently have an ST Micro USBLC6-4 device at the Serializer and Deserialzer. This device has very low capacitance of 3pF. Is there a better application for ESD protection for this chip set or will the USBLC6-4 be a suitable solution?

  • 0
    Mastermind 7395 points

    Why do you have to protect it? How is the LVDS pair exposed to ESD?

  • 0 in reply to Avi Chami1
    Intellectual 260 points

    The system that incorporates the Channel Link III chip set is a two box system. A Controller contains the processor board with the Serializer and a User Interface contains the touch screen display control board with the Deserializer. The two units are connected via a shielded 3 meter CAT5E cable. The cable has an M12 connector on one end for attaching to the Controller and the other end goes through a gland at the user interface housing and connected to the PCA via a shielded RJ45.

    With this setup, the M12 connector on the Controller will be subjected to ESD strikes during compliance testing and therefore protection on this port is required.

    To my dismay, I have verified that without the ESD protection devices, an ESD hit to the M12 connector destroys the Serializer chip.

  • 0 in reply to Bradley Helsel
    Mastermind 7395 points

    TI offers several ESD protections for high speed links, like the TPD6E001

  • 0 in reply to Bradley Helsel
    TI__Genius 13475 points

    Is your shielded RJ45 configured such that the shield/gnd makes contact prior to the signal lines, and if so, how is the shield on the CAT5E connected on either end of the cable?

  • 0 in reply to Mark Sauerwald88474
    Intellectual 260 points

    Hi Mark,

    The RJ45 at both ends is shielded and connected to chassis ground. At the display end of the cable, the shield is connected to chassis ground with a ring-tongue connecter and screw. At the controller end of the cable, the shield is tied to chassis ground through the M12 connector housing. In both cases, the shielded is terminated as soon as possible to try and keep any radiated noise from entering the housings.

    Brad.