2.1 开发软件 Keil C51 uVision2...............................................................................................................1
2.2 仿真软件 Proteus ISIS.........................................................................................................................2
3 总体设计方案论证.........................................................................................................................................4
3.1 开发方案举例......................................................................................................................................4
3.1.1 热敏电阻...................................................................................................................................4
3.1.2 数字温度芯片 DS1621............................................................................................................5
3.2 数据通信技术......................................................................................................................................6
4 系统各部分电路的选择和设计....................................................................................................................6
4.1 系统的工作原理..................................................................................................................................6
4.2 AT89C51 简介.....................................................................................................................................7
4.2.1 概述...........................................................................................................................................7
4.2.2 AT89C51 引脚功能..................................................................................................................7
4.2.3 复位电路的设计......................................................................................................................8
4.3 数字温度传感器..................................................................................................................................9
4.3.1 DS1621 的技术指标................................................................................................................9
4.3.2 DS1621 的工作原理................................................................................................................9
4.4 单片机和 DS1621 接口电路.............................................................................................................10
4.5 七段 LED 数码显示电路..................................................................................................................11
5 系统软件设计...............................................................................................................................................12
5.1 编程语言选择....................................................................................................................................13
5.2 主程序的设计....................................................................................................................................13
5.3 温度采集模块设计...........................................................................................................................14
5.4 温度计算模块设计...........................................................................................................................14
5.5 串行总线编程....................................................................................................................................15
6 软硬件调试结果分析...................................................................................................................................16
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7 总结...............................................................................................................................................................17
参考文献..........................................................................................................................................................17
附录 A 多点温度采集系统电路原理图.........................................................................................................18
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附录 B C 语言源代码......................................................................................................................................20