目 录
前言 ..................................................................................................................................................................1
1 设计要求与方案论证 ..................................................................................................................................2
1.1 设计要求 ..........................................................................................................................................2
1.2 系统基本方案选择和论证 ..............................................................................................................2
1.2.1 单片机芯片的选择方案和论证 ..........................................................................................2
1.2.2 温度传感器设计方案论证 ..................................................................................................3
1.2.3 掉电保持方案论证 ..............................................................................................................3
1.3 电路设计最终方案决定 ..................................................................................................................4
2 主要元件介绍 ..............................................................................................................................................4
2.1 STC89C51 介绍 .................................................................................................................................4
2.1.1 STC89C51 主要功能及 PDIP 封装 .......................................................................................4
2.1.2 STC89C51 引脚介绍 .............................................................................................................4
2.1.3 单片机最小系统： ..............................................................................................................5
2.2 DS18B20 传感器介绍 .......................................................................................................................6
2.2.1 DS18B20 概述 .......................................................................................................................6
2.2.2 DS18B20 引脚介绍 ...............................................................................................................7
2.2.3 DS18B20 的内部结构 ...........................................................................................................7
2.2.4 DS18B20 的程序流程图 .......................................................................................................8
2.3 数码管介绍 ......................................................................................................................................9
2.3.1 数码管概述 ........................................................................................................................10
2.4 AT24C02 简介 .................................................................................................................................10
2.4.1 I2C 总线说明 .....................................................................................................................11
3 程序流程图 ................................................................................................................................................12
图 6：程序流程图 .........................................................................................................................................13
结论 ................................................................................................................................................................14
参考文献 ........................................................................................................................................................15
致 谢 ..............................................................................................................................................................16
附录 1 系统原理图 .......................................................................................................................................17
附录 2 C 语言程序 ......................................................................................................................................18
