The CAN in Automation association (CiA) has released the CiA 604-4 high-bit-rate mode specification for CAN FD light. CAN FD light is a commander/responder communication system specified in an annex of the ISO 11898-1:2024. Using CAN SIC (signal improvement capability) transceivers and the new mode, bit rates up to 8 Mbit/s are possible.
The commander node has always the communication initiative. Responder nodes only communicate on request. This means, no arbitration is necessary. Precise and expensive peripheral circuitry is not necessary. CAN FD light is intended to be used for price-sensitive applications, including LED (light emitting diode) rear lights in passenger cars. In general, CAN FD light is suitable for networks, comprising many simple sensors or actuators. The data link layer protocol frame format complies with normal CAN FD, featuring 64-byte data fields. In respect to the physical transmission, robustness and EMC (electromagnetic compatibility) performance are the same as in traditional CAN networks.
“CAN FD light will be also suitable for 48-V powered vehicles,” said Holger Zeltwanger, CiA Managing Director, “when related CAN transceivers are available.” Currently, CiA members work on a 48-V CAN transceiver specification.
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