ISO 11898-2 standard specifies the High-Speed Physical Medium Attachment (HS-PMA)
sublayer for the Controller Area Network (CAN) protocol. It is the foundational standard for high-speed CAN communication in road vehicles. Microchip Technology Download Options
Official versions of ISO standards are generally paid documents. You can find the most recent versions and previews at the following sources: Official ISO Store : The latest edition is ISO 11898-2:2024
. You can view a preview and purchase the full document on the ISO Online Browsing Platform Standards Repositories : Sites like iTeh Standards ANSI Webstore
provide downloadable previews of the 2016 and 2024 versions. Educational Previews
: Some older or draft versions are available as PDF samples through Standards.iteh.ai Technical Summary INTERNATIONAL STANDARD ISO 11898-2 15 Dec 2016 —
ISO 11898-2 defines the High-Speed Physical Medium Attachment (HS-PMA) for Controller Area Networks (CAN), focusing on electrical specifications for in-vehicle communication. While the full standard is copyrighted, technical documents providing detailed overviews, such as the 2024 preview, are available, alongside comprehensive guides from industry manufacturers. Access the 2024 standard preview at iTeh Standards. Introduction to the Controller Area Network (CAN) (Rev. B)
In the high-stakes world of automotive engineering, a "solid story" isn't just about fiction; it’s about the reliability of the communication highway within every modern vehicle. Here is the story of how ISO 11898-2 became the backbone of vehicle networking. The Problem: A Digital Traffic Jam
Imagine a luxury SUV in the late 1980s. To make the power windows, anti-lock brakes, and engine control units (ECUs) talk to each other, engineers had to run miles of heavy, expensive copper wiring. It was a "rat's nest" that added weight and created endless points of failure. The Hero: The High-Speed CAN Bus To solve this, the ISO 11898-2
standard was born. It defines the "High-Speed Physical Medium Attachment," or the actual physical wires and electrical signals that allow car parts to talk at speeds up to (and up to with the newer CAN FD). The "Secret Sauce":
The standard uses a "Differential Signaling" method. By sending signals over two wires— CAN High (Yellow) CAN Low (Green) —it can cancel out electromagnetic noise from the engine. The Safety Net:
It ensures that even if a spark plug fires nearby, the critical message "Deploy Airbag" or "Apply Brakes" gets through without a glitch. The Evolution: ISO 11898-2:2024
As cars became "smartphones on wheels," the standard had to grow. The latest ISO 11898-2:2024
update introduced smarter power management, allowing certain parts of the car to "sleep" while others stay awake, saving battery life in electric vehicles. How to Access the Standard
If you are an engineer or student needing the official documentation, you can find the ISO 11898-2 PDF through these official channels: CAN Bus Explained - A Simple Intro [2025] - CSS Electronics
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ISO 11898-2 is the international standard for the High-Speed CAN (Controller Area Network)
physical layer. It defines how digital data is converted into electrical signals on a bus for reliable communication in vehicles and industrial systems. Where to Download ISO 11898-2
Because ISO standards are copyrighted, official full versions usually require purchase. However, you can access technical content through these methods: iTeh Standards Official Purchase: The latest edition, ISO 11898-2:2024 , is available for purchase on the ISO Website and authorized distributors like the ANSI Webstore Public Previews:
Free technical previews that include the table of contents and introductory scope are often provided by standards bodies like iTeh Standards ISO Online Browsing Platform Educational Materials:
Many semiconductor manufacturers provide extensive technical summaries that cover the standard's requirements in detail, such as Texas Instruments' CAN Physical Layer Guide Kvaser’s CAN Protocol Tutorial Key Technical Guide to ISO 11898-2 Introduction to the Controller Area Network (CAN) (Rev. B)
The ISO 11898-2 standard is the cornerstone of the Controller Area Network (CAN) physical layer, specifically defining the high-speed physical medium attachment (PMA) sublayer. To access the official full document, you can purchase and download the ISO 11898-2:2024 PDF directly from the International Organization for Standardization (ISO) or authorized distributors like the ANSI Webstore. Overview of ISO 11898-2
ISO 11898-2 governs how electronic control units (ECUs) physically interface with the CAN bus, ensuring reliable data exchange through differential signaling. It is designed primarily for road vehicles but is widely used in industrial automation due to its extreme robustness. Evolution of the Standard
The standard has evolved to keep pace with increasing automotive data demands:
ISO 11898-2:2003: The original baseline for high-speed CAN, supporting bit rates up to 1 Mbps.
ISO 11898-2:2016: Integrated low-power modes and selective wake-up functionalities (formerly parts 5 and 6) and added support for CAN Flexible Data-rate (CAN FD) up to 5 Mbps.
ISO 11898-2:2024 (Current): The latest edition, released in March 2024, introduces support for CAN XL, pushing transceiver speeds to a maximum of 20 Mbit/s. It also adds Signal Improvement Capability (SIC) to manage signal ringing in complex topologies. Introduction to the Controller Area Network (CAN) (Rev. B)
Finding a reliable ISO 11898-2 PDF download is crucial for engineers and developers working with the high-speed Physical Layer of Controller Area Networks (CAN). This standard defines the electrical and functional behavior of the High-Speed Medium Access Unit (HS-MAU), which is foundational for modern automotive communication. Where to Safely Download ISO 11898-2
To ensure you have the correct and most up-to-date documentation, always use official and authorized channels: iso 11898-2 pdf download
Official ISO Store: The most secure way to obtain the document is through the ISO 11898-2:2024 page on the International Organization for Standardization's official website.
National Standards Bodies: Regional organizations like the ANSI Webstore or the DIN Media Shop provide legitimate PDF downloads, often with regional localized versions.
Preview Copies: Many providers, such as iTeh Standards, offer free PDF previews that include the table of contents and scope, allowing you to verify the version before purchasing. Key Sections of the ISO 11898-2 Standard
When you download the PDF, you will find detailed technical specifications across several critical areas: ISO 11898-2:2016 - Controller area network (CAN)
ISO 11898-2 is the international standard for the High-Speed Medium Access Unit of the Controller Area Network (CAN) . It defines the Physical Layer requirements, ensuring that different devices (nodes) can communicate reliably over the same two-wire bus . ISO 11898-2 Official PDF & Documentation
The standard is a copyrighted document and is not typically available for free download from official sources. You can obtain it through the following official channels:
ISO Store: The official source for the most recent version, ISO 11898-2:2024 .
National Standards Bodies: Organizations like ANSI (American National Standards Institute) or BSI (British Standards Institution) often provide digital copies for purchase and download .
Technical Libraries: Many university and corporate libraries offer digital access to standards through platforms like IEEE Xplore. Key Technical Guide Summary
If you are looking for a guide to implementing the standard rather than the full legal text, these technical points cover the core requirements:
Baud Rates: Supports data rates up to 1 Mbit/s for Classical CAN and up to 8 Mbit/s for CAN FD .
Bus Topology & Termination: Uses a linear bus topology. To prevent signal reflections, a 120 Ω termination resistor must be placed at both ends of the bus . Voltage Levels:
Recessive State: Both lines (CAN_H and CAN_L) are at approximately 2.5V .
Dominant State: CAN_H rises to ~3.5V and CAN_L drops to ~1.5V, creating a differential voltage .
Wiring Requirements: Typically requires a twisted-pair cable to minimize electromagnetic interference (EMI) . Recommended Practical Resources Buy/download official standard from ISO or your national
For a detailed "how-to" without purchasing the standard, these application reports from major transceiver manufacturers are highly regarded: AN-1123: Controller Area Network (CAN) Implementation Guide
ISO 11898-2 PDF Download: The Ultimate Guide to the CAN High-Speed Physical Layer Standard
If you are looking for a legal ISO 11898-2 PDF download, it is important to understand that this is a protected international standard. While some sites may offer unauthorized copies, professionals and engineers should always source these documents through official channels to ensure they have the most up-to-date technical data and compliance information. Where to Download ISO 11898-2 Legally
The International Organization for Standardization (ISO) and its national member bodies provide the official version of this standard.
ISO Official Store: The primary source for the latest ISO 11898-2:2024 edition.
ANSI Webstore: The American National Standards Institute provides the PDF for digital download.
DIN Media Store: A reputable European source for automotive standards.
BSI Knowledge: Ideal for UK-based engineers looking for the British Standard (BS) equivalent. What is ISO 11898-2?
ISO 11898-2 specifies the high-speed physical media attachment (HS-PMA) of the Controller Area Network (CAN). It defines how electrical signals are transmitted across the physical wires (usually a twisted pair) to ensure reliable communication between Electronic Control Units (ECUs) in vehicles and industrial machinery. Evolution of the Standard
The standard has undergone significant updates to keep pace with automotive technology:
ISO - International Organization for Standardizationhttps://www.iso.org ISO 11898-2:2016 - Controller area network (CAN)
If your goal is to design or debug a CAN bus without paying hundreds of dollars, consider these alternatives:
ISO 11898-2:2003 is often sold second-hand on platforms like Amazon or AbeBooks for a fraction of the price. For many legacy systems, the 2003 version is still perfectly valid.
Drafts (Committee Draft, CD) are sometimes available on ISO’s public portal under "Work Programme," but they are watermarked and not for commercial use.
While the standard does not enforce a specific connector shape, it references the pin assignments for the 9-pin D-Sub connector frequently used in industrial CANopen applications. List likely official sources to purchase from
No. ISO standards are commercial documents. The only free versions are unauthorized copies or previews.
The standard defines two logical states: