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Original question:

TCAN334: Recommended Passives

TCAN334: TCAN334

vvn
Prodigy 50 points
Part Number: TCAN334

Hi

Does the CAN bus need to be impedance controlled in layout? With the following placement reference differential signal routing is not possible. Any suggestions?

Currently in my layout the D1 to J1 distance is 1 inch.

  • 0
    TI__Genius 15345 points

    You do not have to differentially route your signal, that is just the most ideal way to route the CAN bus. My only real recommendation is that the termination resistors are as close to the transceiver as possible. The diode distance is not as important just make sure it is close and along the signal path. The distance to the connector is not as important.

    Best,

    Chris

  • 0 in reply to Chris Ayoub
    Prodigy 50 points

    Hi Chris,

    Does that mean impedance control is not required on CAN bus routing?

  • 0 in reply to vvn
    TI__Genius 15345 points

    What do you mean by impedance control?

    On a CAN bus it is very important that each device only drives a 60 ohm load. That is how CAN devices are designed. That is why we suggest two 120 ohm termination resistors in parallel on the bus. One 120 ohm resistor on each of the two termination nodes on the CAN bus:

    That is the only impedance matching that you have to do. The termination resistor are critical for CAN communication and must be included on the bus.

    Best,

    Chris