reu05b0069_r8cap| Application Note
APPLICATION NOTE
R8C Family
Renesas LIN Overview
Introduction
LIN is a communication and distributed processing bus system. It is characterized by low cost hardware and a relatively low data transmission speed and number of bus nodes. Only a microcontroller with a common UART interface hardware is necessary. LIN is limited to 64 data frame identifiers and a bus speed of 20 kbaud. The size of a network is typically under 12 nodes. A primary topic for looking at a communication bus is that of centralized vs. distributed processing. Does it make sense to wire all sensors and actuators to one central MCU, or does it make more (economical!) sense to have `smart' sensors and actuators that communicate with each other via some sort of bus? There are two primary reasons why one might want to choose a distributed processing configuration: 1) Reduction of wiring complexity 2) Reuse of hardware modules in multiple products. Distributed processing with LIN supports the reuse of hardware modules in multiple products. LIN makes the `scale tip' in favor of distributed processing due
to its low per device hardware cost. CAN requires a more complex peripheral, as more transaction mechanisms are solved by the hardware. In LIN, almost all functionality is done by the firmware. The LIN specification also introduces a mechanism for module discovery and configuration. In short: LIN as a solution that provides a very simple and inexpensive method of module interconnection.
Figure: LIN Data Link Layer
REU05B0069-0103/Rev.1.03
December 2008
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