CAN FD Light: A "Handler/Dog" Protocol

July 21, 2020

Press Release

CAN FD Light: A "Handler/Dog" Protocol

CiA has established a Special Interest Group to develop a "handler/dog" data link layer protocol based on CAN FD. It is intended for use in sensor/actuator networks such as automotive lighting systems

The nonprofit CiA (CAN in Automation) association to develop a “handler/dog” data link layer based on the CAN FD protocol as specified in ISO 11898-1:2015.

The “handler” node implements the CAN FD protocol and sends 11-bit identifier FD frames. The “dog” nodes transmit data frames in FBFF (FD base frame format) only on request of the “handler” node. According to the company, this avoids the implementation of high-performance and costly oscillators.

The protocol engine of the “dog” nodes is simplified compared to a CAN FD controller. Error and overload frames are not supported at all. However, data fields of up to 64 byte are possible. The bit-rate is not switched and limited to one fixed value, for example 1 Mbit/s.

This commander/heeler approach is suitable for embedded networks in LED devices for passenger cars. Other application examples include door control subsystems and air-conditionings with a lot of sensors.

The CiA Special Interest Group (SIG) is named “CAN FD light”. According to the company, Fred Rennig from ST Microelectronics chairs the group, which is comprised of about 20 experts from different companies.

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