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TCA9517-Q1: Automotive I2C bus extender to over 5M cable

Nicky Lim
Genius 3195 points
Part Number: TCA9517-Q1
Other Parts Discussed in Thread: TCA9517

Hello,

Looking for AEC-Q100 certified I2C bus extender to use 5M cable.

Can TCA9517-Q1 extend I2C bus to 5M length?

Or could you recommend other AEC-Q100 certified extender?

Regards,

Nicky 

  • 0
    TI__Guru 60540 points
    Hey Nicky,

    "Can TCA9517-Q1 extend I2C bus to 5M length?"
    It depends on the cable you are using. With cat5 cable, the parasitic capacitance is about 50pF/m. At 5 meters we can expect 250pF of capacitance. TCA9517 can support up to 400pF of capacitance so this can work.

    Please note that you will need to be sure the B sides of the TCA9517 cannot be connected to each other.

    Okay:
    TCA9517 B side>--------5m cable----------<A side TCA9517

    Okay:
    TCA9517 A side>--------5m cable----------<A side TCA9517

    Okay:
    TCA9517 A side>--------5m cable----------<B side TCA9517

    BAD:
    TCA9517 B side>--------5m cable----------<B side TCA9517

    Thanks,
    -Bobby