基于AT89S52的直流數字電壓表設計:隨著電子科學技術的發展，電子測量成為廣大電子工作者必須掌握的手段，對測量的精度和功能的要求也越來越高，而電壓的測量甚為突出，因為電壓的測量最為普遍。本設計在參閱了大量前人設計的數字電壓表的基礎上，利用單片機技術結合A/D轉換芯片A/D574A構建了一個直流數字電壓表。本文首先簡要介紹了設計電壓表的主要方式以及單片機系統的優勢；然后詳細介紹了直流數字電壓表的設計流程，以及硬件系統和軟件系統的設計，并給出了硬件電路的設計細節，包括各部分電路的走向、芯片的選擇以及方案的可行性分析等。
關鍵詞?：單片機(MCU)； 電壓；A/D轉換；AD574A；ISD1420

Abstract: With the development of electronical scientific technology, electronical measurement became a technic that everyone of engaging electronical had to master it. What’s more, the precision is higher and higher and, the function is more and more powerful, and voltage’s measurement is best important. Primarily, I designed a Digital-Voltmeter use MCU technic with A/D-switch chip(AD574A) base on lots of predecessor design. In this article, introduce some methods that design Digital- Voltmeter and the advantages of use MCU system to do it on the first; then treat the procedure of design of direct- Digital-Voltmeter,contain the hardware and software.?
Keywords: Micro Controller Unit；Voltmeter；A/D switch；AD574A；ISD1420