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This paper discusses requirements on the CAN physical layer in order to meet current automotive EMC standards. It also presents EMC measurement results on an advanced CAN transceiver product along with implementation hints. New EMC investigations show that unshielded bus cable is suitable even for higher bit rates, provided that the physical layer components are EMC-optimized.

This paper points out that the electromagnetic compatibility (EMC) of in-vehicle multiplex networks is largely determined by the EMC of the transceiver ICs, being the interface between the network nodes and the wiring harness. Test setups and procedures for conducted immunity and emission measurements are used for the evaluation of single- and dual-wire transceiver ICs implementing the network concepts SAE/J1850/VPW, single wire CAN, fault tolerant CAN and high speed CAN. Tentative qualification limits for this evaluation concept are proposed for both electromagnetic immunity and emission. The performance of toady's components relative to the suggested qualification limits is shown using single wire CAN and high speed CAN as examples.