AN1077 View Datasheet(PDF) - STMicroelectronics
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MFG CO.
'AN1077' PDF : 14 Pages View PDF
OVERVIEW OF ENHANCED CAN CONTROLLERS FOR ST7 AND ST9 MCUS
1 INTRODUCTION
1.1 EVOLUTION OF AUTOMOTIVE NETWORKS
For several years CAN has been the world wide standard automotive communication protocol.
Well established in power train applications in its high speed version, CAN is now used to con-
nect a high number of ECUs in each car body. This body network - known as low speed CAN
- brought major changes with its introduction.
Standardized Higher Layer
Today automotive manufacturers and their suppliers are going one step further towards stand-
ardization, integrating the OSEK software modules on each ECU.
Hierarchical architectures
To master the complexity caused by the increasing number of ECUs in car bodies, several
networks and sub-networks are required. This limits the number of nodes connected to one
network, but requires more nodes with a simple gateway function.
Low-end communication protocol
Local sub-networks - e.g. within one door module - does not need the full multi- master capa-
bilities, speed and robustness of CAN. For this purpose the LIN communication protocol has
been introduced as a low-cost solution.
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