Silent-interval impedance matching for short pulse CAN to enhance scalability

Controller area network (CAN) is a communication standard for in-vehicle networks and is widely employed by a number of vehicle lines. Recently, it is required for CAN to enhance the scalability of bus topology and bit rate because the functionality of in-vehicle devices is becoming high and their number is increasing. However, the scalability enhancement of CAN will cause ringing waves with higher amplitude and longer duration as compared with those of pulse waves. The short pulse CAN (SP-CAN) has been proposed to enhance the scalability of CAN but it does not remove the ringing effect perfectly. In this paper, silent-interval impedance matching (SIIM) is proposed for SP-CAN to enhance the scalability of bus topology and bit rate. The simulation and experimental results show that the proposed scheme can remove the ringing effect perfectly for the scalable bus topology and bit rate.