The Controller Area Network (CAN) is a communication protocol designed for transmitting data in harsh environments. This application note demonstrates a basic protection circuit that uses a dual TVS diode array, Bourns® Model CDSOT23-T24CAN, to provide surge protection per IEC 61000-4-5 and ESD protection per IEC 61000-4-2.
The figure shows a typical CANbus differential communication scheme with n transceivers communicating on the serial bus. A twisted pair cable with a nominal characteristic impedance of 120 ohms is used to transmit the signal between nodes on the bus. The cable is terminated on both ends. In the example in the figure, shows a split termination that is often used to improve Electromagnetic Compatibility.