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摘 要

进入21 世纪以来，科学技术的发展已难以用日新月异来描述。新工艺、新材料、新的制造技术催生了新的一代电子元器件，同时也促使电子测量技术和电子测量仪器产生了新概念和新发展趋势。各种电子测量仪器的发展趋势越来越优异，电压测量是电子测量中的基本内容，因此电压表是测量仪器中不可缺少的设备。目前广泛应用的是采用专用集成电路实现的数字电压表，随着电子技术的发展，测量要求也越来越精确，测量工具的性能要求也越来越高。数字电压表已成为实现测量自动化、提高工作效率不可缺少的仪表，数字化是当前计量仪器发展的主要方向之一。

数字化发展离不开单片机的应用，单片机是一种集成电路芯片，采用超大规模技术把具有数据处理能力的微处理器(CPU)集中到一块芯片上。随着单片机技术的飞速发展，单片机技术已成为一个国家现代化科技水平的重要标志。

单片机可单独地完成现代工业控制所要求的智能化控制功能，这是单片机最大的特征。单片机控制系统能够取代以前利用复杂电子线路或数字电路构成的控制系统，可以软件控制来实现，并能够实现智能化。

基于以上思路，本设计采用ATMEL公司的AT89C52实现数字直流电压表系统的设计，其主要具有如下功能：

测量0-5V的直流电压，最小分辨率为0.02V，使用8段LED数码管模块稳定显示所测量的电压。

本设计以AT89C52单片机为核心，以逐次逼近式A/D转换器ADC0808进行模数转换，使用8段LED数码管模块显示，设计了数字直流电压表系统。在设计的正文中详细介绍了软硬件系统的各部分电路，介绍了逐次逼近式转换电路的原理，89C52的特点，ADC0809的功能和应用，8段LED数码管的应用。该电路设计新颖、功能强大、可扩展性强。

关键词：电压测量 单片机 AT89C52 ADC0808 LED数码管

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Abstract

Into the 21st century, scientific and technological development has been difficult to describe with each passing day. New technology, new materials, new manufacturing technology spawned a new generation of electronic components, but also to promote electronic measurement and electronic measuring instruments produced new concepts and new trends. The development of electronic measuring instruments growing trend of excellent voltage measurements are the basic elements of electronic measurement, measuring instruments, therefore voltmeter is an indispensable device. Is now widely used by ASIC to achieve the digital voltage meter, with the development of electronic technology, more and more precise measurement requirements, measurement tools, performance requirements have become more sophisticated. Digital voltmeter has been achieved measurement automation, improve efficiency indispensable instruments, digital measuring equipment is currently one of the main direction of development.

Digital can not develop without the application of SCM, SCM is an integrated circuit chip, using technology to large scale data processing with a microprocessor (CPU) concentrated in a single chip. With the rapid development of single chip microcomputer, microcontroller technology has become a national important indicator of the level of modern technology. SCM can be individually required to complete the modern industrial control intelligent control, which is the biggest single chip features. Microcomputer control system can replace the previous use of complex electronic circuits or digital circuits of the control system software control can be achieved and can achieve intelligent.

Based on these ideas, the design uses ATMEL Corporation AT89C52 digital DC voltage meter system design, its main function is as follows:

Measurement 0-5V DC voltage, the minimum resolution of 0.02V, using 8 LED digital control module displays the measured voltage stability.

The design AT89C52 microcontroller as the core, successive approximation A / D converter ADC0808 analog to digital conversion, using 8 LED digital control module shows the design of digital DC voltage meter system. In the design details of the body parts of the system software

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and hardware circuits, introduces successive approximation conversion circuit theory, 89C52 features, ADC0809 features and applications, 8-segment LED digital control applications. The circuit design of novel, powerful, and scalable.

Key words: Voltage Measurements SCM AT89C52 ADC0808 LED Digital Tube

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