文档介绍：2013届毕业设计说明书

高精度多路A/D采集系统的设计
院、部: 电气与信息工程学院
学生姓名:
指导教师: 职称讲师
专业: 电气工程及其自动化
班级: 电气本0904
完成时间: 2013-5-25
摘要

数据采集系统已成功的运用到军事、航空电子设备及宇航技术、工业等领域。由于数据采集系统的不断提高,出现了高性能、高可靠的单片机数据采集系统(DAS)。数据采集技术已经成为一种专门的技术,在工业领域得到了广泛的应用,在工业的控制领域中,越来越多的模拟信号需要2数字量来显示。需求的精度越来越高,采集通道越来多。因此,数据采集系统是模拟域与数字域之间必不可少的纽带,它的存在具有非常重要的作用。
本文主要介绍了基于单片机的高精度的多路A/D采集系统的设计。系统主要包括硬件设计和软件设计,硬件设计包括单片机主控模块、A/D模数转换模块、LCD液晶显示模块,键盘输入模块。数据采集的控制是采用了AT89S51单片机为核心来实现,11路模拟信号通过A/D转换器TLC2543进行模数转换。实现模拟量到12位二进制数字量的转换,并将转换后的数据通过单片机接收、处理、并用LCD液晶来显示所采集的结果。此系统采样精度为1/4096,经过数据处理后,液晶所显示数据结果可以精确到小数点后7位。同时通过键盘作为人机交换接口,通过键盘来操作,来选择TLC2543所连接11路中其中一通当前测试值。软件设计采用C51编程,实现对数据采集系统、模数转换系统、数据显示、数据通信等功能。
关键词:A/D转换;高精度;单片机;液晶显示
A
bstract
With the constantly improvement of data acquisition system (DAS), which has been significantly applied to these fields like military, avionics, aerospace technology and industry and so on, there evoluted a single-chip puter DAS that has high performance and high reliability. And this expertise has been extensively applied to the field of industry. Since at the control point of this field, more and more analog signals need be displayed in digital quantity. And this process need higher and higher demand of precision and more and more demands of acquisition channels. DAS is the essential connection between the analog domain and the digital domain.
This thesis will mainly introduce a system design based on single-chip puter DAS of high accuracy and multi-channel A/D. This design consists of hardware design and software design, of which the hardware design includes the single-chip puter control module, A/D conversion module, LCD module and keyboard input module. And the data acquisition control process of it adopts AT89S51 as the core, where analog signal converts into12 bit binary digital quantity through the A/D converter TLC2543, and then be received, processed and displayed on LCD. These final data on LCD could be given to seven decimal places with the sampling accuracy of it at