National foreword

This British Standard is the UK implementation of ISO 11898‑2:2016.

The UK participation in its preparation was entrusted to Technical Committee AUE/16, Data Communication (Road Vehicles).

A list of organizations represented on this committee can be obtained on request to its secretary.

This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.

Compliance with a British Standard cannot confer immunity from legal obligations.

Foreword

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The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).

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The committee responsible for this document is ISO/TC 22, Road vehicles, Subcommittee SC 31, Data communication.

This second edition cancels and replaces the first edition (ISO 11898‑2:2003), which has been technically revised, with the following changes:

max output current on CANH/CANL has been defined (Table 4);
optional TXD timeout has been defined (Table 7);
receiver input resistance range has been changed (Table 10);
Bit timing parameters for CAN FD for up to 2 Mbps have been defined (Table 13);
Bit timing parameters for CAN FD for up to 5 Mbps have been defined (Table 14);
content of ISO 11898‑5 and ISO 11898‑6 has been integrated to ensure there is one single ISO Standard for all HS-PMA implementations;
selective wake-up (formerly ISO 11898‑6) CAN FD tolerance has been defined;
wake-filter timings (formerly in ISO 11898‑5) have been changed (Table 20)
requirements and assumptions about the PMD sublayer have been shifted to Annex A, to clearly focus on the HS-PMA implementation.

A list of all parts in the ISO 11898 series can be found on the ISO website.

Introduction

ISO 11898 was first published as one document in 1993. It covered the CAN data link layer as well as the high-speed physical layer. In the reviewed and restructured ISO 11898 series, ISO 11898‑1 and ISO 11898‑4 defined the CAN protocol and time-triggered CAN (TTCAN) while ISO 11898‑2 defines the high-speed physical layer, and ISO 11898‑3 defined the low-speed fault tolerant physical layer.

Figure 1 shows the relation of the Open System Interconnection (OSI) layers and its sublayers to ISO 11898‑1, this document as well as ISO 11898‑3.

The International Organization for Standardization (ISO) draws attention to the fact that it is claimed that compliance with this document may involve the use of a patent concerning the selective wake-up function given in 5.9.4.

ISO takes no position concerning the evidence, validity and scope of this patent right.

The holder of this patent right has assured ISO that he/she is willing to negotiate licenses under reasonable and non-discriminatory terms and conditions with applicants throughout the world. In this respect, the statement of the holder of this patent right is registered with ISO. Information may be obtained from the following:

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights other than those identified above. ISO shall not be held responsible for identifying any or all such patent rights. ISO (www.iso.org/patents) maintains on-line databases of patents relevant to their standards. Users are encouraged to consult the databases for the most up to date information concerning patents.

1 Scope

This document specifies the high-speed physical media attachment (HS-PMA) of the controller area network (CAN), a serial communication protocol that supports distributed real-time control and multiplexing for use within road vehicles. This includes HS-PMAs without and with low-power mode capability as well as with selective wake-up functionality. The physical media dependant sublayer is not in the scope of this document.

2 Normative references

3 Terms and definitions

4 Symbols and abbreviated terms

5 Functional description of the HS-PMA

5.1 General

5.2 HS-PMA test circuit

5.3 Transmitter characteristics

5.4 Receiver characteristics

5.5 Receiver input resistance

5.6 Transmitter and receiver timing behaviour

5.7 Maximum ratings of V_{CAN_H}, V_{CAN_L} and V_Diff

5.8 Maximum leakage currents of CAN_H and CAN_L

5.9 Wake-up from low-power mode

5.10 Bus biasing

6 Conformance

Bibliography

BS ISO 11898-2:2016

Road vehicles. Controller area network (CAN) - High-speed medium access unit

Published:

30 Nov 2022

Withdrawn:

26 Mar 2024