[工学]高精度温度设计.doc

摘 要 温度测量是工农业生产、现代科学研究及高新技术开发过程中一个极其普遍而重要的测量项目。现代电子检测技术正朝着高集成度、低功耗、可编程方向发展，传统的指针式温度指示器已经跟不上社会的发展需求。 国内外在便携式温度测量仪这方面的研究及应运相当多，便携式电子设备重要指标之一就是低功耗，低功耗是国际上节能和绿色环保的要求，是全球化趋势。但现有便携式测温仪功耗基本都在180pw以上，而且精度比较低价格比较高。 本论文研究了一种超低功耗便携式温度测量仪，该测温仪采用温度传感器DS18B20，高集成度，超低功耗单片机STC89C51，实现对温度的采集和处理。完成超低功耗便携式温度测量仪样机的试制，并对样机进行了性能测试，测试结果达到设计要求。 关键词：高精度温度测量仪 DS18B20 STC89C51 ABSTRACT Temperature measurement is the industry and agriculture production, modern science research and high technology development in the process of a very common and important measure. Modern electronic detection technology are on a high level of integration, low power consumption, programmable direction, the traditional pointer type temperature indicator has couldnt keep up with the development of the society needs. In portable temperature measurement instrument at home and abroad and the research of this aspect and quite a few times, portable electronic devices is one of important index of the low power consumption, low power consumption is the international energy saving and green environmental protection request, is the globalization trend. But the existing portable highlighted.it is in 180 the power consumption of the basic pw above, and precision are low prices are higher. This paper studies a low power consumption portable temperature measuring instrument, this highlighted.it a temperature sensor DS18B20, high level of integration, low power consumption MCU STC89C51, realizes to the collection of temperature and processing. Finish low power consumption portable temperature measurement prototype trial, the sample the performance test, the test results to meet the design requirements. Keywords: HPTMI; DS18B20; STC89C51 目 录 第一章 绪 论 1 1.1 高精度温度仪概述 1 1.2 高精度温度仪的原理 2 1.3 高精度温度仪的分类 2 第二章 系统硬件设计 3 2.1 系统整体方案的选取 3 2.1.1 方案一 3 2.1.2 方案二 3 2.2 系统总体设计 3 2.2.1 系统总体设计 4 2.2.2 硬件原理图 4 2.3 主要器件工作原理 5 2.3.1 单片机STC89C51的介绍 5 2.3.2 温度传感器DS18B20的介绍 7 2.3.3 晶振与复位 10 2.3.4 MAX232 11 2.3.5 RS232 12 2.3.6 显示电