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AN2264

更新时间： 2022-11-25 11:11:16

品牌	Logo	应用领域
摩托罗拉 - MOTOROLA		半导体
页数	文件大小	规格书
20页	288K
描述
Freescale Semiconductor, Inc.

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AN2264 数据手册

Freescale Semiconductor, Inc.

Application Note

AN2264/D

Rev. 0, 3/2002

LIN Node Temperature

Display

by Peter Topping

8/16 Bit Applications Engineering

Motorola, East Kilbride

Introduction

Many of the problems of excessive wiring within a car can be resolved by using

a serial multiplex bus like CAN or LIN. The LIN (Local Interconnect Network,

reference 1) bus is lower in cost and ideally suited to use within a door or in

other areas in the car where its limited data rate of 20,000 baud is adequate.

The display of external temperature is an application which falls into this

category. As a common location for the outside temperature sensor is in a wing

mirror, the data often originates from the door. The actual display is, however,

within the car some distance away and the LIN bus is eminently suitable to

facilitate the connection. A LIN node requires only 3 wires; there is one LIN data

line, the other two connections being the positive and negative supplies.

This application note presents the design of a temperature display LIN slave

node. It was developed as part of a complete door project which also included

the keypad module described in application note AN2205. The messaging

scheme for the door incorporated a byte for temperature in the mirror response

field as shown in table 1. The LIN master is, in this case, the body controller.

On a regular basis, say every 100ms, the master sends a frame header with

the mirror’s ID and it responds with the two-byte message shown. It includes a

byte with the temperature encoded in half Centigrade degree increments from

–30°C to 97.5°C. In this case the data is read directly by the temperature

display node (slave to slave communication) but could alternatively be read by

the master and retransmitted to the relevant slave node.

For More Information On This Product,

Go to: www.freescale.com

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