The Controller Area Network (CAN) is a serial communication protocol designed for providing reliable high−speed data transmission in harsh environments.CAN system designers are being challenged to meet stringent Electromagnetic Interference (EMI) and Electrostatic Discharge (ESD) standards and increase reliability, while reducing the size and cost of their products. This video provides guidelines to select a CAN bus protection circuit that can prevent conducted and radiated EMI and ESD noise problems. The attributes of several practical CAN bus protection circuits will be analyzed using discrete filters,common mode chokes and Transient Voltage Suppression (TVS) devices.
The Common Mode Choke (CMC) is the first interference suppression in CAN networks in order to reduce EME.
Split termination reduces EME and improves EMI.
The CAN communication protocol is a carrier-sense, multiple-access protocol with collision detection and
arbitration on message priority (CSMA/CD+AMP).
CAN-C is a high-speed bus, defined in ISO 11898-2.
The CAN-B is a low-speed bus defined in ISO 11898-3.
Logic bus states: dominant and recessive.
Split termination.
ESD and EMC/EMI protection.
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