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TCAN1043G-Q1: connect 2 TCAN1043 together

user4979899
Expert 3080 points

Part Number: TCAN1043G-Q1

Hi Sir,

In order to save one external connector, my customer target to design the 2 TCAN1043G-Q1 as below diagram,

Is it workable? Is there any side effect?

Thanks

  • 0
    TI__Guru 74922 points

    Anne,

    This should technically work since even in a standard CAN bus topology, the U2 would just be connected after the choke (ignoring the connector). The system will also be relying on all protective and filter components to work for both CAN buses. Is there any way the customer could connect after the choke (closer to the connector) and add protective components on the second CAN bus? The termination can remain just on one.

    Regards,

  • 0 in reply to Eric Hackett
    TI__Expert 3080 points

    Hi Eric,

    Thanks for your reply.

    My customer's purpose is saving the component and PCB space and they need to find an optimal solution for connecting two CAN transceivers together.
    And U1 and U2 are both CAN BUS of end point. Can we still use one termination for two end point CAN transceiver?
    If so, we hope to use the minimum component to realize the architecture.
    Do you have any advice about that?
    Do you have any tool to simulation the CAN circuit?

    Thanks

    Anne Wu

  • 0 in reply to user4979899
    TI__Guru 74922 points

    Anne,

    Because these are end points, it's required to have termination at both nodes to mitigate signal reflections. What kind of application is this? Depending on the environment the customer may be able to get away with not have some of the filter capacitors or protection components if they don't expect a lot of noise or high risk for transients.

    One tool that we've used internally is CANoe along with Vector’s USB/CAN interface boxes for testing. Using these tools allows for simulation of CAN frames and CAN frame decoding. More information can be found at Vector's website, here.

    Regards,