徐海学院07届电子技术综合设计报告 第- 1 -页
电子技术综合设计任务书
学生姓名 专业年级 学号
设计日期： 2009 年 12 月 28 日 至 2010 年 1 月 8 日 设计题目： 电子技术综合设计 设计专题题目：简易数字钟 设计主要内容和要求：
1. 主要内容：
① 用 CC4518双四位BCD同步加计数器设计60秒、60分、24小时归0
的计数电路；
② 用CC4511 七段译码驱动/锁存器及LG5011AH共阴数码管设计译码及显示电路；
③ 用脉冲开关设计校准功能；
④ 用555多谐振荡器构成秒脉冲信号发生器 2. 整体电路原理图
60秒（60分）及24小时------计数、译码、显示
3. EWB仿真图
60秒、60分、24小时------计数、译码、显示
4. 设计原理图
用PROTEL99设计原理图并打印。
5. 设计PCB版图
用PROTEL99设计PCB板并打印。
6. 功能扩展要求
设计：①整点报时功能 ②12小时归1计数电路
指导教师签字：
徐海学院07届电子技术综合设计报告 第- 2 -页
目录
摘要 ················································································································ - 3 - 一.单元电路设计 ································································································ - 4 - 1.1 设计构思 ·································································································· - 4 - 1.2 脉冲发生器 ······························································································· - 4 - 1.2.1 多谐振荡器的构成 ················································································ - 4 - 1.2.2 石英晶体振荡器电路 ············································································· - 6 - 1.3 秒、分、小时计数电路 ············································································· - 6 - 1.4 译码、显示电路 ····················································································· - 8 - 1.5 校时电路(如图13) ················································································· - 10 - 二．数字时钟电路设计 ······················································································ - 11 - 2.1 数字钟电路PROTEL设计图 ·········································································· - 11 - 2.2 系统整体仿真图 ························································································ - 12 - 2.3 印刷电路板的元件分布图 ············································································ - 12 - 三．设计的扩展与开发 ······················································································ - 13 - 3.1 数字时钟闹钟功能 ····················································································· - 13 - 3.2 仿电台报时电路 ························································································ - 13 - 3.3 定时报时电路原理图 ·················································································· - 14 - 四.总结 ·········································································································· - 15 - 五.参考文献 ···································································································· - 15 - 六．附录 ········································································································ - 16 - 6.1 数字钟电路原理图（见A3白纸手工画图） ····················································· - 16 - 6.2 六位数字钟安装及元件清单 ········································································ - 16 -
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徐海学院07届电子技术综合设计报告 第- 3 -页
摘要
本次综合设计的数字时钟主要实现实现60秒、60分、24小时的计数、译码、显示；具有校准功能；自带秒脉冲信号发生器，并且附加了定时与模仿电台的整点报时功能，总体设计框图如下。
设计中主要运用了用 CC4518双四位BCD同步加计数器设计60秒、60分、24小时归0的计数电路；用CC4511 七段译码驱动/锁存器及LG5011AH共阴数码管设计译码及显示电路（数码管需加限流电阻）；用脉冲开关设计校准功能；用32768Hz晶振构成秒脉冲信号发生器，（32768Hz脉冲需经过CD4060的14级分频得到2Hz脉冲，再经过CD4040的2分频得到秒脉冲。
关键词： 脉冲； 分频； 计数； 译码； 显示；校时
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