ISO has approved ISO 11898-1 as a Draft International Standard with no negative votes. This document specifies the Classical CAN and the CAN FD protocols.
CAN FD, THE IMPROVED CAN PROTOCOL, is standardized in ISO 11898-1. In the DIS (Draft International Standard) ballot, 15 countries voted with yes and several abstained. Four countries submitted comments mainly of editorial and general nature. The responsible ISO working group will observe those comments. After implementing the observed findings, the English document will also be translated into French and published simultaneously as an international standard in both languages.
There is also a need to standardize CAN transceivers supporting higher bit-rates than 1 Mbit/s. This will be done in the ISO 11898-2 standard. The review and update of this standard is also in preparation. The ISO 11898-2 has successfully passed the Committee Draft ballot.
The DIS version is under development and will be submitted soon. The new ISO 11898-2 standard also comprises the former definitions of ISO 11898-5 (low-power function) and ISO 11898-6 (selective wakeup function).
The conformance test plan for CAN FD implementations will be standardized in ISO 16845-1. The test plan for high-speed transceiver chips (ISO 16845-2) needs to be updated. A new work item proposal is already in preparation.
With the acceptance of the CAN FD protocol as a DIS, the chipmakers can start implementing ISO compliant CAN FD. “The days of the non-ISO CAN FD implementations are over,” said Holger Zeltwanger, CiA Managing Director. “The investment is now save.” Cypress is the first micro-controller vendor providing an ISO compliant CAN FD implementation. Of course, several companies have already implemented ISO CAN FD in FPGAs.
During the CAN FD Tech Day in Stuttgart, organized by CiA, several companies presented their CAN FD products. The presentations covered a broad range of general information and detailed hints and kinks to design CAN FD networks. All speakers and tabletop exhibitors appreciated that the “unsure” days are over and the CAN FD standard has achieved a stable status. Now they can start to promote their products more seriously.
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