毕业设计论文（基于单片机数据采集系统）含源代码

毕 业 论 文（设计）

题 目： 学 号：姓 名：年 级：学 院：系 别：专 业：指导教师：完成日期：

基于80C51单片机和TLC2543的多路 数据采集系统设计 信息科学技术学院 电子通信系 通信工程

摘 要

在工业生产和科学技术研究的各行业中,常常利用PC或工控机对各种数据进行采集。数据采集技术是信息科学的重要分支，是传感器、信号获取、存储与处理等信息技术结合。本文采用TI公司的11路12位串行模数转换器TLC2543和Philips公司推出的增强型80C51系列单片机P89C51RA2组成多路高精度的数据采集系统。这个数据采集系统特点是实现低成本、高可靠性、多点的数据采集，并且具有易实现、 、易编程、移植 、体积小、功耗低等优点。该系统还可通过USB数据总线接口与PC机进行数据通信，达到在PC机上实时的显示、存储和处理采样数据的目的。以上所有的特性使得本系统可很好的应用于实验室或工业现场等多种场合的多路数据实时采集。

关键词：TLC2543；A/D转换；数据采集

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Abstract

PC and Industrial PC are often utilized in all walks of life in industrial production and scientific research to acquire various data. Data acquiring technology is an important branch of information science, and it combine transducer, signal obtaining, information storing and processing together. This paper adopts 11 analog input channels and 12-bit -analog-to -digital converter called TLC2543 from TI Company and enhancement mode 80C51 series signal-chip computer called P89C51RA2 from Philips Company to form the multi-function and high-accuracy data gathering. With small size and low power consumption, this kind of data gathering technology is easy to realize, program, and transplant. This system also can carry on data communication with PC through USB data bus interface and PC, and it can finally achieve display, memory, and sample processing. With the characteristics mentioned above this system will be well applied in the laboratory, industry, or other departments where the multi-function real time data acquire technology can be used.

Keyword: TLC2543 ; A/D converter; data acquisition

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目 录

摘 要 ........................................................................................................... I Abstract .............................................................................................................. II 1 引言 ........................................................................................................... - 1 -

1.1 研究意义 ........................................................................................... - 1 - 1.2 研究内容 ........................................................................................... - 1 - 2 数据采集系统的构成 ............................................................................... - 2 - 3 基于USB的数据采集系统的硬件设计 ................................................. - 3 -

3.1系统的原理及其组成 ........................................................................ - 3 - 3.2 硬件电路的芯片选择 ..................................................................... - 5 -

3.2.1 单片机芯片选择 ..................................................................... - 5 - 3.2.2 模—数转换芯片选择 ............................................................. - 6 - 3.3 TLC2543和单片机的接口电路设计............................................. - 8 - 3.4 电压跟随器的设计 ......................................................................... - 9 - 3.5 制作USB数据采集系统电路板 ................................................. - 10 -

3.5.1 画原理图 ..............................................................................- 11 - 3.5.2 画PCB图.............................................................................- 11 -

4 USB数据采集系统软件编程 ................................................................ - 14 -

4.1 TLC2543的工作原理................................................................... - 14 -

4.1.1 TLC2543的工作过程............................................................ - 14 - 4.1.2 接口时序 ............................................................................. - 14 - 4.2 采集模块程序设计 ....................................................................... - 16 -

4.2.1 A/D转化程序设计 ............................................................. - 17 -

5 系统调试 ................................................................................................. - 18 - 6 结束语 ..................................................................................................... - 20 - 致 谢 ........................................................................................................... - 21 - 参考文献 ....................................................................................................... - 22 - 附录 A：A/D转换程序 .............................................................................. - 23 - 附录 B：主程序 .......................................................................................... - 26 -

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