Top Design Questions About Isolated CAN Bus Design

This application note addresses key design considerations for isolated Controller Area Network (CAN) bus systems. It outlines the necessity of isolating CAN nodes in various industrial and automotive applications, particularly when ground potential differences exceed the common mode voltage range supported by standard transceivers. The document details options for achieving isolation, including discrete and integrated solutions, and emphasizes the importance of proper power generation methods for isolated CAN nodes. It also discusses the significance of bus termination in maintaining signal integrity and preventing data loss, as well as the differences between common mode range and bus standoff voltage as defined by the CAN standard. The note serves as a comprehensive guide for engineers seeking to implement reliable and efficient isolated CAN bus designs, providing answers to frequently asked questions and referencing specific Texas Instruments products that facilitate these designs.