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由于受CAN收发器的限制,在一个CAN总线网络中最多只能有110个CAN节点,或达到10km的通信距离,所以当所需CAN总线网络的节点、距离超出以上限制时,就必须进行CAN总线网络的扩展。目前一般的扩展方式是加CAN总线中继器,这种方法方便简单的同时却增加了系统造价,在此我们提出了一种基于模拟开关ADG663的CAN总线网络扩展方案,在无须CAN中继器或其他设备的情况下实现两个或是多个CAN总线网络的连接,本文介绍了具体的扩展方法以及软硬件设计。
Due to the limitations of CAN transceivers, there can only be up to 110 CAN nodes in a CAN bus network or up to 10km communication distance. Therefore, when the required node distance of the CAN bus network exceeds the above limit, CAN Bus network expansion. At present, the general expansion method is to add CAN bus repeater, this method is simple and convenient but increases the system cost. Here we propose a CAN bus network expansion scheme based on the analog switch ADG663. Without the CAN repeater Or other devices to achieve the connection of two or more CAN bus networks, this article describes the specific expansion methods and hardware and software design.