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1、0/24 目录1.设计任务.1 1.1 设计目的.1 1.2 设计指标.1 1.3 设计要求.1 2.设计思路与总体框图.1 3.系统硬件电路的设计.23.1 主控电路.23.2 液晶显示电路.33.3 按键电路.3 3.4 报警电路.44.系统仿真设计.44.1 仿真原理图.44.2 各功能元件的分析.5 5.系统软件设计.10 5.1 主程序.11 5.2 读出温度子程序.11 5.3 温度转换命令子程序.12 5.4 设计温度子程序.12 5.5 1602的温度显示.13 6.总结与体会.136 1 总结.136.2体会.147.参考文献.15 8.附录.16 1.设计任务1/24 1.
2、1 设计目的1.了解数数字温度计及工作原理。2.进一步掌握数字温度计设计方法。3.进一步掌握各芯片的逻辑功能及使用方法。4.进一步掌握 keil和仿真软件的应用。5.进一步熟悉集成电路的引脚安排.。1.2 设计指标1.显示温度。2.可以显示大于零度的温度也可以显示小于零度的温度。3.具有显示相应环境温度的功能，并且具有超出设定范围内温度时可以报警的功能，相应环境可以人为选择。1.3 设计要求1.画出总体设计框图，以说明数字温度计由哪些相对独立的功能模块组成，标出各个模块之间互相联系。并以文字对原理作辅助说明。2.设计各个功能模块的电路图，加上原理说明。3.选择合适的元器件，在面包板上接线验证、
3、调试各个功能模块的电路，在接线验证时设计、选择合适的输入信号和输出方式，在确定电路充分正确性同时，输入信号和输出方式要便于电路的测试和故障排除。4.在验证各个功能模块基础上，对整个电路的元器件和布线进行合理布局，进行整个数字温度电路的接线调试。2.设计思路与总体框图.数字温度计由主控制器 、显示器(LCD1602、独立按键和报警电路组成，温度传感器所感应的温度信号经过其数据传输引脚传送给单片机，单片机将所接收到的温度信号经过处理，将其送至显示器 LCD1602 显示，并且能够通过独立按键设置温度报警值，若温度处于报警上限和下限之外，报警电路工作。图1 所示为数字温度计的一般结构框图：报 警 温
4、 度 调整键STC90C51 主控制器 LCD1602 显示文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y
5、2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5
6、A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R
7、8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W
8、4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2
9、O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM
10、6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X62/24 图1 数字温度计结构框图3.系统硬件电路的设计3.1 主控电路单片机 STC90C51 具有低电压供电和体积小等特点，四个端口同时使用以满足电路系统的设计需要，很适合便携手持式产品的设计使用系统
11、可用二节电池供电。晶振采用12MHZ。图2 主控电路 DS18B20 传感器蜂鸣器，指示灯单片机时钟振荡文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档
12、编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9
13、X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W
14、3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6
15、文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10
16、A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z
17、6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X63/24 图3 晶振电路3.2 温度显示电路采用液晶显示屏 LCD1602显示，第一行显示“18B20 OK TL”和报警下限值,第二行显示实时温度以及报警上限
18、值，并且能够显示负温度值。用P0口进行 LCD1602 的数据写操作，P2.5P2.7 口进行 LCD1602的命令控制端口。电路图如下：图4 温度显示电路3.3 按键电路本系统一共设置了四个按键，k1 键设置温度下限加，k2 键设置温度下限减k3 键设置温度上限加，k4 键设置温度上限减。文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 Z
19、X8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编
20、码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X
21、2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3
22、 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文
23、档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A
24、9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6
25、W3 ZX8N2O5A4X64/24 图5 按键电路3.4 报警电路本设计采用蜂鸣器和LED灯组成报警电路，电路图如下：图6 报警电路4系统设计仿真4.1 仿真原理图根据数字温度计的一般结构框图，我们通过查阅资料书和上网查询，了解不同元件的功能和实用性，考虑性价比后，制作出的数字温度计的仿真电路原理图，如图 7 所示。文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2
26、 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3
27、ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档
28、编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9
29、X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W
30、3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6
31、文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10
32、A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X65/24 图 7 数字温度计仿真电路原理图4.2 各功能元件的分析2设计原理图中各功能元件的引脚图的分析如下所示：1DS18B20：DS18B20温度传感器是美国DALLAS半导体公司最新推出的一种改进型智能温度传感器，与传统的热敏电阻等测温元件相比，它能直接读出被测温度，并且可根据实际要求通过简单的编程实现9-12 位的数字值读数方式。DS18B20的性能特点如下：1）独特的单线接口仅需要一个端口引脚进行通信，DS18B20 在与微处理器连接时仅需要一条口线即可实现微处理器与DS18B20 的双向通讯。2）DS18B20 支持多点组网功
33、能，多个DS18B20 可以并联在惟一的三线上，实现多点组网测温；3）无须外部器件，全部传感元件及转换电路集成在形如一只三极管的集成电路内；文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2
34、Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A
35、4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8
36、E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4
37、Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O
38、5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6
39、R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X66/24 4）可通过数据线供电，电压范围为3.0-5.5；5）零待机功耗；6）温度以 9或12位数字，对应的可分辨温度分别为
40、0.5、0.25、0.125 和0.0625，可实现高精度测温；7）用户可定义报警设置；8）报警搜索命令识别并标志超过程序限定温度温度报警条件）的器件；9）负电压特性，电源极性接反时，温度计不会因发热而烧毁，但不能正常工作；10）测量结果直接输出数字温度信号，以 一线总线 串行传送给 CPU，同时可传送 CRC 校验码，具有极强的抗干扰纠错能力DS18B20采用3脚PR35封装或8脚SOIC封装，其引脚排列及内部结构框：图 8DS18B20 引脚排列图图 9 内部结构框图文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9
41、W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N
42、2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:C
43、M6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 H
44、Q9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX
45、8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码
46、:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2
47、 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X67/24 图 10 DS18B20测温原理图64 位 ROM 的结构开始 8 位是产品类型的编号，接着是每个器件的惟一的序号，共有 48 位，最后 8 位是前面 56 位的 CRC 检验码，这也是多个DS18B20可以采用一线进行通信的原因。温度报警触发器TH 和 TL，可通过软件写入户报警上下限。DS18B20 温度传感器的内部存储器还包括一个高速暂存RAM 和一个非易失性的可电擦除
48、的EERAM。高速暂存 RAM 的结构为 8 字节的存储器，结构如图4 所示。头 2 个字节包含测得的温度信息，第3 和第 4 字节 TH和 TL 的拷贝，是易失的，每次上电复位时被刷新。第5 个字节，为配置寄存器，它的内容用于确定温度值的数字转换分辨率。DS18B20工作时寄存器中的分辨率转换为相应精度的温度数值。该字节各位的定义如图5 所示。低 5 位一直为 1，TM是工作模式位，用于设置DS18B20在工作模式还是在测试模式，DS18B20出厂时该位被设置为0，用户不要去改动，R1 和 R0 决定温度转换的精度位数，来设置分辨率。温度 LSB 温度 MSB TH用户字节 1 TL用户字节
49、 2 配置寄存器预置斜率累加器比较低 温 度 系 数 振 荡计数器 1 温度寄存器Tx 预置=0 高 温 度 系 数 振 荡-0 计数器T1加 1 停止T2文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2
50、 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3 ZX8N2O5A4X6文档编码:CM6R8E10A9X2 HQ9W4Y2Z6W3