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TCAN334: CAN Termination

user5908499
Prodigy 110 points
Part Number: TCAN334

1.What should the capacity of "CSPLIT" be when the termination method is "Split Termination"?

2.What is "integrated pull down"?

Is it necessary to pull down SHDN and STB externally?

  • 0
    TI__Guru 62910 points

    Hello,

    For CSPLIT, an exact value is not required but a common recommendation is 4.7 nF.  This capacitance is intended to provide a low-impedance path to ground for high-frequency common mode noise, and changing the capacitance value would vary the range over which the filtering would be effective.

    If a logic input has an integrated pull-down, it means that if nothing else drives a voltage onto the input then its state will be biased to a low level.  This is equivalent in function to an external pull-down resistance.  However, in the case of the SHDN and STB pins the internal pull-down function is very weak.  To avoid things like leakage currents or coupled noise from unintentionally toggling these pins, I would recommend using an additional external pull-down resistor (valued between 1 kOhm and 10 kOhm) on these pins if they will be high-impedance in the application.

    Please let me know if this is unclear or if you have any further questions.

    Regards,
    Max