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TCAN1044A-Q1: Daisy chain

Raul Pena
Prodigy 40 points

Part Number: TCAN1044A-Q1

TCAN1044AVDRBRQ1 transceiver supports a daisy-chain topology? If so, how should the physical connections be wired to the connector?

  • 0
    TI__Guru* 76022 points

    Hi Raul,

    Yes, please see figure 9-3 and 9-5 of the data sheet, thanks.

    Best Regards,

    Michael.

  • 0
    Prodigy 40 points

    Yes means it support daisy chain?

    Figure 9-3 show a typical CAN bus, it is not a daisy chain, could you confirm (Daisy chain has not a common bus)?

    Figure 9-5 shows a typical CAN bus layout, daisy chain must have 4 pins in the connector J1 (2 for CAN-H and 2 for CAN-L), could you confirm?

    Do you have any documentation about the daisy chain configuration that we could show to the customer?

  • 0 in reply to Raul Pena
    TI__Guru* 76022 points

    Hi Raul,

    The device supports the standard CAN physical layer defined by ISO 11898. Figure 9-3 of the datasheet illustrates the recommended CAN bus topology, which consists of a linear bus with termination resistors at both ends and multiple nodes connected to the bus through short stubs.

    Furthermore, the device does not provide dedicated bus input and output pins and therefore does not implement a specific "daisy-chain mode." If a system is physically wired such that CANH and CANL enter and exit each ECU through pass-through connectors, this may be considered a system-level implementation of the CAN bus and is transparent to the transceiver.

    For example, the system designer may decide to use CANH, CANL, supply and GND as the 4 pins or a pass-through implementation may use separate CANH_IN / CANH_OUT and CANL_IN / CANL_OUT connector pins but this may not be a requirement of the device. Hence, the  transceiver only interfaces to the CANH and CANL bus lines as shown in the figures and may daisy-chain as needed, thanks.

    Best Regards,

    Michael.