ISO 11898-2 is a critical standard for high-speed CAN communication. While full access to the standard requires purchase from authorized sources, you can explore complementary materials to deepen your understanding. For practical implementation, ensure compliance with the standard’s specifications to avoid interoperability issues.
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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 iso 11898-2 pdf download
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
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 is a critical standard for high-speed
Yes, you can legally download or purchase the ISO 11898-2 standard through authorized portals like the ISO Store or the ANSI Webstore. Complete Guide to ISO 11898-2 (CAN High-Speed)
The ISO 11898-2 standard serves as the absolute backbone for modern automotive communication. If you are designing an Electronic Control Unit (ECU) or working with in-vehicle networks, understanding this specific document is non-negotiable.
Below is a complete breakdown of what this standard covers, why it is critical, and how you can legally access the official documentation. 🚗 What is ISO 11898-2?
ISO 11898-2 is the international standard that specifies the High-Speed Physical Medium Attachment (PMA) sublayer for the Controller Area Network (CAN).
While ISO 11898-1 governs the data link layer (how data is packaged and managed), ISO 11898-2 defines the physical reality of how that data actually travels across wires. It specifies exactly how CAN transceivers must operate to translate digital 1s and 0s into actual electrical voltages on the bus. Core Technical Focuses Controller Area Network (CAN) Standards - The ANSI Blog
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| Signal | CAN_H (min) | CAN_H (max) | CAN_L (min) | CAN_L (max) | Differential | |--------|-------------|-------------|-------------|-------------|--------------| | Recessive (1) | 2.0V | 3.0V | 2.0V | 3.0V | -0.5V to +0.05V | | Dominant (0) | 2.75V | 4.5V | 0.5V | 2.25V | 1.5V to 3.0V |
The standard defines two logical states:
No. CAN FD (Flexible Data-Rate) is covered by ISO 11898-1:2015 for the data link layer. The physical layer for CAN FD up to 2 Mbit/s still references ISO 11898-2, but for 5 Mbit/s or more, you need ISO 11898-2:2024 (recently revised).
Even if you cannot download the standard immediately, here are the critical specifications you need to know for high-speed CAN design:
The standard correlates data rate with bus length. As the speed increases, the maximum cable length decreases.
If your goal is to design or debug a CAN bus without paying hundreds of dollars, consider these alternatives: