CAN FD: Introduction to CAN With Flexible Data Rate

Controller Area Network with Flexible Data Rate (CAN FD) is an extension to the classic CAN protocol that was developed to meet the needs of modern vehicles wherever-increasing numbers of embedded electronics are transmitting ever-increasing amounts of control and diagnostic data. Find out more: https://community.nxp.com/t5/Blogs/10...

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Chapters:
00:00 Introduction
00:17 Communication within vehicles
00:37 CAN Networks
01:17 CAN FD
01:21 Advantages of CAN FD over CAN networks
02:25 CAN FD Drivers

▬ Controller Area Networks (CAN)▬▬▬▬▬▬▬▬▬▬▬▬
The Controller Area Network (CAN bus) is a message-based communication network standard that allows electronic control units (ECUs) to communicate within a vehicle without the use of dedicated analog signal wires. By utilising multiplex wiring, CAN significantly reduces cost, complexity and weight of a design and allows new features to be implemented in firmware, allowing for over-the-air firmware updates and saving further on engineering design time.

▬ Controller Area Networks with Flexible Data Rate (CAN FD)▬▬▬▬▬▬▬▬▬▬▬▬
Controller Area Network with Flexible Data Rate (CAN FD) is an extension to the Classic CAN protocol that was developed to meet the needs of modern vehicles wherever-increasing numbers of embedded electronics are transmitting ever-increasing amounts of control and diagnostic data. Because the original CAN specification has a maximum bandwidth limitation of 1 Mbps, data-dense activities like ECU flashing and advanced driver assistance systems (ADAS) applications were being impeded, forcing automotive manufacturers to add multiple CAN networks into newer vehicles. This required additional wiring, thus adding weight and complexity to the vehicle which decreased performance and fuel efficiency. To solve this problem, CAN FD was developed to support flexible data rates (thus the name CAN with Flexible Data Rate) up to eight Mbps as well as to increase the data payload size from eight bytes up to 64 bytes

▬Advantages of CAN FD▬▬▬▬▬▬▬▬▬▬▬▬
For applications running up against the limitations of Classic CAN, however, CAN FD provides four main advantages:

Increased data transfer rate – As previously mentioned, Classic CAN is capable of a maximum data bit-rate of 1 Mbps. CAN FD has a max data transfer rate of eight Mbps and can also dynamically switch to faster or slower bit-rates with larger or smaller frame sizes. This means CAN FD has higher bandwidth at lower latency, with better real-time performance.
Support for larger payloads – Message payload size is increased to 64 bytes in CAN FD compared to eight bytes in a Classic CAN frame, leading to improved bus efficiency when sending larger amounts of data.
Improved error detection – CAN FD boasts increased performance in the CRC algorithm over Classic CAN, thus lowering the risk of undetected errors.
Security – As seen in the news in recent years, CAN bus hacking is a genuine threat with potentially catastrophic consequences. The increased bandwidth of CAN FD allows manufacturers to implement cryptography methods to secure data and authenticate devices on the bus.

▬ About NXP▬▬▬▬▬▬▬▬▬▬▬▬
NXP Semiconductors N.V. enables secure connections for a smarter world, advancing solutions that make lives easier, better, and safer. As the world leader in secure connectivity solutions for embedded applications, NXP is driving innovation in the automotive, industrial & IoT, mobile, and communication infrastructure markets.

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