1－wire總線在MCS51環(huán)境下的研究與開發(fā)

電氣自動(dòng)化論文編號(hào):ZD230 論文字?jǐn)?shù):14664,頁(yè)數(shù):42

目  錄
摘要  ………………………………………………………………………………………Ⅰ
Abstract  …………………………………………………………………………………Ⅱ
第1章 緒  論 ……………………………………………………………………………1
第2章  1－wire總線技術(shù)及其應(yīng)用 ……………………………………………………4
 2.1 1－wire總線的工作原理 ………………………………………………………4
 2.2 1－wire總線的信號(hào)傳送方式 …………………………………………………5
 2.3 單總線器件介紹 ………………………………………………………………9
第3 章 基于DS18B20的溫度檢測(cè)系統(tǒng)的設(shè)計(jì) …………………………………………11
 3.1 單總線數(shù)字溫度傳感器DS18B20 ………………………………………………12
 3.1.1 概 述 ………………………………………………………………………12
 3.1.2 DS18B20特性簡(jiǎn)介 …………………………………………………………12
 3.1.3 DS18B20的硬件結(jié)構(gòu) ………………………………………………………13
 3.1.4 DS18B20 的電源供電方 …………………………………………………16
 3.1.5 DS18B20的測(cè)溫原理 ………………………………………………………17
 3.1.6 DS18B20與主機(jī)之間的通信協(xié)議 …………………………………………18
 3.2 DS18B20與單片機(jī)的典型接口設(shè)計(jì) …………………………………………21
 3.3測(cè)溫系統(tǒng)的軟件設(shè)計(jì) …………………………………………………………21
 3.3.1 DS18B20 的底層基本操作程序 …………………………………………21
 3.3.2 DS18B20 的設(shè)備序列號(hào)的掃描 …………………………………………25
 3.3.3 DS18B20的精確延時(shí)問題 …………………………………………………25
 3.4 DS18B20設(shè)計(jì)中應(yīng)注意的幾個(gè)問題 ……………………………………………26
結(jié)束語(yǔ) ……………………………………………………………………………………27
參考文獻(xiàn) …………………………………………………………………………………28
致謝 ………………………………………………………………………………………29
附錄1測(cè)溫系統(tǒng)主要芯片介紹……………………………………………………………30
附錄2溫度檢測(cè)源程序清單………………………………………………………………36

摘  要

    本論文主要研究美國(guó)DALLAS公司推出的單總線（即1—wire總線）技術(shù)的原理和信號(hào)傳輸方式，說明了單總線通信協(xié)議，并且對(duì)1—wire總線在MCS51環(huán)境下的實(shí)現(xiàn)機(jī)制作進(jìn)一步研究。
 單總線即只有一根數(shù)據(jù)線，系統(tǒng)中的數(shù)據(jù)交換、控制都由這根線完成。設(shè)備通過一個(gè)漏極開路或三態(tài)端口連至該數(shù)據(jù)線，以允許設(shè)備在不發(fā)送數(shù)據(jù)時(shí)能夠釋放總線，而讓其它設(shè)備使用總線。
 單線總線是眾多現(xiàn)場(chǎng)總線中極具競(jìng)爭(zhēng)力的一種。它具備能與計(jì)算機(jī)進(jìn)行數(shù)字通訊、總線負(fù)載量大、布線簡(jiǎn)單、精度高、性能穩(wěn)定、價(jià)格便宜等多方面優(yōu)點(diǎn)。單總線控制的真正優(yōu)勢(shì)在于：作為信號(hào)源，無需考慮如何解決通訊協(xié)議問題；在絕大多數(shù)場(chǎng)合，不用考慮總線上連接的傳感器數(shù)量；在大多數(shù)場(chǎng)合甚至不需另外提供電源。它的最大好處就是讓用戶更方便。
    針對(duì)1—wire總線技術(shù)特點(diǎn)，應(yīng)用1—wire器件數(shù)字溫度傳感器DS18B20，在MCS51單片機(jī)環(huán)境下組成一個(gè)溫度測(cè)量系統(tǒng)。

關(guān)鍵詞：1—wire；單片機(jī)；DS18B20

Study On the One－wire bus under the environment of MCS51

Abstract
 This thesis mainly studies single and total line( namely total line of One- wire) technical principle and signals that the American company of DALLAS release to deliver the way, explaining the single and total line  correspondence agreement, and to the total line of One- wire under the environment of MCS51 of carry out the mechanism to make the further research.
 The total line of single line is a kind that has the competition ability very much in numerous lines with total the spot. It has and can carry on numerical communication, the total line load's have great capacity with calculator, cloth line JIAN3 LIAN4, accuracy is high, function stability, price cheapness etc. various advantage. It is deluxe state of the industry the spot system design. The real advantage of a glimmer of control lie in: Be the signal source, did not need to be consider how resolve the communication agreement problem; At the great majority situation, need not consideration spread of total and on-line conjunction feeling machine quantity; Even don't need to provide another power supply in most situations. Its biggest advantage is to make the customer more convenient.
     Aim at the One- wire  total line  technique characteristics, apply the One- wire machine  number of items word temperature to spread the feeling machine DS18B20, constitute a temperature to measure the system under a machine of MCS51 environment.

Key words: One—wire ； MCU；DS18B20