Controller Area Network (CAN) and Flexible Data-Rate (CAN FD)

Developed by Bosch, CAN with Flexible Data-Rate (CAN FD) is an extension to the original CAN protocol as specified in ISO 11898-1 that responds to increased bandwidth requirements in automotive networks. CAN FD has the support of semiconductor chip manufacturers and end users alike, with Infineon, NXP, Daimler and GM among the companies behind the new standard.

Search CAN FD-compliant:  Hardware | Software
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CAN FD : An Overview

A standard CAN network is limited to 1 MBit/s, with a maximum payload of 8 bytes per frame. CAN FD increases the effective data-rate by allowing longer data fields – up to 64 bytes per frame – without changing the CAN physical layer. CAN FD also retains normal CAN bus arbitration, increasing the bit-rate by switching to a shorter bit time only at the end of the arbitration process and returning to a longer bit time at the CRC Delimiter, before the receivers send their acknowledge bits. A realistic bandwidth gain of 3 to 8 times what’s possible in CAN will particularly benefit flashing applications.

When building CAN FD systems and sub-systems, the higher bit-rate demands that more information is known about the physical layer as achieving maximum bit rate will highly depend on the physical layer quality. CAN FD messages also demand a common Time Quanta and that the location of the sampling point be known. For these reasons, CAN FD systems will require more advanced troubleshooting tools.

Kvaser and CAN FD

Kvaser made an early start in CAN FD and has since implemented additional functions into its CAN FD controller logic. This can be used to provide information on how to configure the CAN bits to optimize the bit timing settings in existing CAN bus layouts and identify the maximum bit-rate for a CAN FD implementation in a given harness.

In accordance with our mission to be the leading provider of innovative and cost efficient CAN solutions, we are fully committed to supporting the CAN FD standard and aim to release CAN FD compliant interfaces and dataloggers as soon as microcontrollers and a conformance test solution for the new standard become available.

Kvaser’s CAN FD implementation passed the Bosch spec test. This test verifies the ability to run CAN FD without significant numbers of error frames or other problems on the bus.

Kvaser announced that Microchip Technology, Inc., with whom it has worked closely to test and validate its IP, is integrating Kvaser’s CAN and CAN FD IP in future controller products destined for automotive and industrial applications.

Read the Press Release »

can fd controller

Purchasing the CAN FD IP Block

Kvaser has a strategic partnership with Synective Labs to commercialize its complete set of IP blocks for CAN FD, which are now available for FPGA and ASICs for non-strategic customers.

To get the CAN FD Implementation, please contact Synective Labs:

Andra Långgatan 48
SE-413 27 Göteborg
+46 (0)31 760 72 40

CAN FD Articles and Resources

CAN FD Considerations for Different Stakeholders

Kent Lennartsson’s paper, “CAN FD Considerations for Different Stakeholders “, explains the practical implications of CAN FD for Managers, Software Developers, RT Engineers, and more. Find out what CAN FD means for you.

Download the PDF »

can fd controller
Comparing CAN FD with Classical CAN

Kent Lennartsson recently released a paper, “Comparing CAN FD with Classical CAN“, which looks at the differences between the CAN bus that most engineers are familiar with, and the latest innovation for this platform.

Download the PDF »

Virtual CAN FD Bus Presentation

Lars Berno Fredriksson, president of Kvaser AB and chairman of the J1939 Next Generation Task Force, has published a white paper discussing a technique for multiplexing CAN with another protocol to meet the high-speed, high data volumes required by next generation heavy duty vehicles.

Download the PDF »

Bit Timing Calculator

Kvaser has released a Bit Timing Calculator for CAN FD. Use this tool to calculate system parameters and set up a reliable CANbus.

Go to Calculator »

Additional Resources:

iCC Paper: ‘CAN with Flexible Data-Rate’ by Florian Hartwich, Robert Bosch GmbH

iCC Paper: ‘How to use high bit rates in a CAN system’ by Kent Lennartsson and Jonas Olsson, Kvaser AB

More information on CAN FD from CAN in Automation.

Recent CAN FD News


MathWorks adds CAN FD capability to MATLAB and Simulink

30/04/2021 | News

Kvaser partner MathWorks latest software release of MATLAB® and Simulink®, R2021a, adds CAN FD capability to the Vehicle Network Toolbox™,… Read More

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Kvaser Presents CAN FD at Chinese CiA Technology Day

27/04/2021 | News

This CiA technology day focuses on specific application fields and topics, relevant for the Chinese CAN community. The speakers discuss… Read More

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CAN FD Light Featured Image - automotive headlight assemblies

CAN FD Light for robust, reliable lighting applications

24/09/2020 | News

The CAN in Automation (CiA) association has established the CAN FD Light Special Interest Group with the goal of serving sensor/actuator and LED networking in automotive applications.

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New bite-size video series gives practical insight into CAN


With real world examples, common practices, and an in-depth look at DBC files, this video series gives a real-world insight into CAN.

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BroadR-Reach vs CAN FD Article Header Image

BroadR-Reach vs. CAN FD: A Comparison

22/05/2019 | White Papers

What is BroadR-Reach and how is it used? BroadR-Reach is an ethernet physical layer standard that allows for more cost-effective… Read More

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New white paper discusses ways to maximise CAN’s efficiency in next generation vehicles

23/04/2019 | White Papers

Lars Berno Fredriksson, president of Kvaser AB and chairman of the J1939 Next Generation Task Force, has published a white… Read More

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can bus

CAN FD technology day in Prague

09/10/2018 | News

Kvaser Technical Associate Miroslav Macháček from Mach Systems s.r.o. will be speaking at CAN in Automation’s CAN FD day in… Read More

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Supporting CAN FD and the non-ISO version

09/10/2018 | Press Releases

CAN FD interfaces and data loggers come in two variants: products that implement Bosch’s original protocol, which are referred to… Read More

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Kvaser Shares CAN FD Possibilities With Design News

14/09/2018 | News

It’s no secret that here at Kvaser, we’re excited about the possibilities that CAN FD is enabling in the automotive… Read More

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Embedded Systems Academy article

CANopen FD software at the ready

08/02/2018 | News

The latest release of Embedded Systems Academy’s (EmSA) CANopen Magic software now supports both CANopen and CANopen FD.

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