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ISO 11898-2:2016

Standardization of CAN FD high-speed transceivers

ISO has published the standard for transceivers that support Classical CAN and CAN FD. The document also specifies low-power and selective wake-up transceivers.

Besides Infineon; Microchip, NXP, and Texas Instruments have released transceiver chips compliant with ISO 11898-2:2016 (Photo: Infineon)

The ISO 11898-2:2016 standard specifies the CAN high-speed physical media attachment (HS-PMA) of the Controller Area Network (CAN). This includes HS-PMAs without and with low-power mode capability as well as with selective wake-up functionality. The physical media dependent sub-layer is not in the scope of this document. The publication was expected much earlier because the technical content was already agreed and fixed in summer 2015. The related conformance test plan will be standardized in ISO 16845-2. This document is in the final balloting and will be published in spring 2017.

Chipmakers already provide CAN transceiver chips compliant to the standard, which specifies in detail the requirements for 2 Mbit/s and 5 Mbit/s data-rates. CiA also recommends using components qualified for 5 Mbit/s for lower bit-rates. This gives the system designer a wider safety margin for the bit symmetry.

The published standard is intended for chipmakers and not for device and system design engineers. All device and network design specifications given in the legacy document have been deleted. To help engineers understand the CAN FD physical layer design, CiA is going to release the CiA 601 series. First parts were already released last year. At the moment, they are under review and new versions will be released soon. CiA 601-1 contains information on how to read the ISO standard from the designer point of view. In addition, readers can find more details on designing CAN FD nodes and networks in the CAN Newsletter magazine as well as in the iCC proceedings.

SAE also released CAN FD system design recommendations: J2284-4 for 2-Mbit/s networks and J2284-5 for 5-Mbit/s point-to-point links. JasPar, the Japanese association of carmakers, is also working on CAN FD design recommendations. In addition, OEMs have additional requirement specifications. For non-automotive applications of CAN FD networks, CiA will provide industry-specific recommendations for CANopen FD physical layers. Therefore, CiA calls for experts interested in developing guidelines for CAN FD network designs. Requests for generic industrial automation and for mobile machines have already been made.


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