ISO 11898-2-2024 PDF

Full title and description

St ISO 11898-2-2024 — Road vehicles — Controller area network (CAN) — Part 2: High-speed physical layer (ISO 11898-2:2024)

Abstract

This document specifies the high‑speed physical layer for the Controller Area Network (CAN) used in road vehicles and related applications. It updates and consolidates requirements for electrical characteristics, transmission medium, connectors, signaling levels, bit timing considerations and physical-layer behavior to support high‑speed CAN communications, including robustness, interoperability and electromagnetic compatibility (EMC) considerations.

General information

• Status: Published / current
• Publication date: 2024
• Publisher: ISO (International Organization for Standardization) — national adoption indicated by "St" prefix
• ICS / categories: 35.240.60 (Road vehicles — Electronics), 33.060 (Telecommunications and information exchange)
• Edition / version: 2024 edition (Part 2 of ISO 11898 series)
• Number of pages: Typically 20–40 pages (exact page count depends on the published national adoption document)

Scope

This standard defines the high‑speed CAN physical layer characteristics required for reliable, interoperable communication between ECUs and other devices on vehicle networks and industrial systems adopting CAN high‑speed. It covers the transmission medium, voltage and timing levels, differential signaling, termination, bus fault conditions, wake/sleep behavior, and EMC/EMI considerations necessary to ensure correct operation up to the defined high‑speed data rates.

Key topics and requirements

• Electrical characteristics of the differential bus (dominant/recessive levels, common‑mode limits).
• Signal timing constraints and bit‑timing recommendations for high‑speed operation.
• Bus topology, wiring harness and recommended cables, including impedance and length considerations.
• Termination resistor requirements and placement to limit reflections.
• Error and fault handling at the physical layer (short‑circuit behavior, fail‑safe requirements).
• Wake‑up and sleep signaling behavior and low‑power modes relevant to vehicle systems.
• EMC and EMI requirements and testing guidance to ensure robust operation in automotive environments.
• Interoperability requirements to allow devices from different manufacturers to operate on the same bus.

Typical use and users

Engineers and designers of automotive electronic control units (ECUs), wiring harness designers, test and validation teams, product managers for vehicle networks, and system integrators use this standard when specifying or implementing the CAN high‑speed physical layer. It is also used by suppliers of transceivers, cable and connector manufacturers, test laboratories and certification bodies to validate compliance and interoperability.

Related standards

ISO 11898 series (including Part 1 for data link layer), ISO 11898-1, ISO 11898-3 (low-speed fault‑tolerant CAN physical layer), ISO 24234 (CAN FD data link and physical layer considerations), ISO 14229 (UDS diagnostic services) for higher‑layer integration, and relevant automotive EMC and wiring standards.

Keywords

CAN, Controller Area Network, high‑speed CAN, physical layer, automotive networking, differential signaling, termination, EMC, transceiver, ISO 11898-2:2024

FAQ

Q: What is this standard?

A: ISO 11898-2:2024 specifies the high‑speed physical layer for Controller Area Network (CAN) buses used primarily in road vehicles and related applications, defining electrical, timing and physical wiring requirements.

Q: What does it cover?

A: It covers differential signal levels, transmission medium properties, termination, bit timing considerations, fault behavior, wake/sleep behavior and EMC requirements to ensure reliable high‑speed CAN communication and interoperability.

Q: Who typically uses it?

A: Automotive ECU designers, transceiver and cable manufacturers, wiring harness designers, test labs, system integrators and anyone specifying or validating CAN physical-layer implementations.

Q: Is it current or superseded?

A: The 2024 edition is the most recent version for Part 2 of ISO 11898 at the time of publication. Organizations should confirm national adoption details and check for any corrigenda or amendments.

Q: Is it part of a series?

A: Yes. It is part of the ISO 11898 series covering CAN, where Part 1 addresses the data link layer and other parts address alternate physical layers and extensions (for example low‑speed fault‑tolerant and CAN FD related documents).

Q: What are the key keywords?

A: CAN, high‑speed CAN, ISO 11898-2, physical layer, automotive network, differential signaling, termination, EMC.