As the number of ECUs in an automobile steadily increases, the demand for ever more ECUs connected to the Controller Area Network (CAN) also rises significantly. However, the number of connectable ECUs in a linear passive star CAN is restricted because of the ringing phenomenon in communication signals. In this paper, we propose a ringing suppression circuit activated on high level ringing voltages. As a result, we can expand the number of connectable ECUs in a linear passive star, which enables construction of low-cost communication networks by reducing the number of gateways required.
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