This application note presents a reference design of a compact isolated CAN module by using isolated transceiver ISO1050 and transformer driver SN6501. Compared to current solutions in the industry, this design has the advantages of easy implementation, high reliability, low EMI, and low cost. The ISO1042 can be used as a performance upgrade to the ISO1050.
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Today, along with the fast popularization of CAN-bus, the application field is more diversified and complicated than before. Un-proper node design causes poor communication, and even one node failure can result in damage to an entire bus, especially in a harsh environment. Therefore, essential protection circuit should be implemented into node design to improve reliability and reduce unnecessary damage. For common design, isolation for digital signal and power is added between the controller and the transceiver. In some applications that require higher ESD protection, TVS should be added in the bus.
The current solutions are either too complicated (for example, digital isolator, CAN transceiver, and isolated power) or too expensive. As a viable solution, the combination of ISO1050 with SN6501, a compact, high-performance and low-cost reference design, is provided.