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TCAN1044-Q1: Multiplexing a Single CAN-FD Interface (TCAN1044-Q1) to 16 External CAN Buses using TMUX1309-Q1

SHOU-ZHI ZHUAGN
Prodigy 60 points

Part Number: TCAN1044-Q1
Other Parts Discussed in Thread: TMUX1309-Q1

尊敬的TI E2E支援團隊：

我們有一個關於TCAN1044-Q1的問題。

目前，我們板載MCU只有一個CAN-FD接口，但我們需要測試16組外部CAN線路。

我們目前的解決方案是：MCU -> TCAN1044-Q1 -> TMUX1309-Q1 x 4 -> 16 連接埠 CAN 總線

我們想問：

  1. 這種交換/多工方案是否有佈局問題？

  2. 還有其他更好的測試方法嗎？

謝謝。

此致，

傑夫

  • 0
    TI__Guru* 77812 points

    Hi Shou-Zhi,

    Please note that this is not a standard CAN topology per 9.2.2.1 of the data sheet as it seems to be a star topology with 1 transceiver feeding into 16 branches (not a 2-terminator bus). Each branch should act like a stub with extra R-on and capacitance from the TMUX and may include reflections / ringing, especially as speed increases. 

    It can work if stubs are kept short similar to the data sheet's 9.2.2.1 I.e., keep all traces as short and symmetric as possible, routed as a differential pair.

    Also note that TMUX is not rated for surges and would recommend to ensure proper protection (TVS, series R, CMC, etc) while ensuring only one line is connected at a time.

    May also consider muxing TXD / RXD instead of CANH / CANL or an automotive analog switch / relay if you must switch the physical bus, thanks.

    Best Regards,

    Michael.