概述DS18B20是DALLAS公司生产的一线式数字温度传感器,具.(最新整理)

1、概述： ds18b20 是 dallas 公司生产的一线式数字温度传感器，具有 3 引脚 to92 小体积封装形式；温度测量范围为55125,可编程为 9 位12 位 a/d 转换精度， 测温分辨率可达 0.0625，被测温度用符号扩展的 16 位数字量方式串行输出；其工作电源既可在远端引入，也可采用寄生电源方式产生；多个 ds18b20 可以并联到 3 根或 2 根线上，cpu 只需一根端口线就能与诸多 ds18b20 通信，占用微处理器的端口较少，可节省大量的引线和逻辑电路。以上特点使 ds18b20 非常适用于远距离多点温度检测系统。内部结构：ds18b20 内部结构如图 1 所示，主要

2、由 4 部分组成：64 位 rom、温度传感器、非挥发的温度报警触发器 th 和 tl、配置寄存器。ds18b20 的管脚排列如图 2 所示，dq 为数字信号输入输出端；gnd 为电源地；vdd 为外接供电电源输入端。图 1ds18b20 的内部结构图 2ds18b20 的管脚排列关键特性：0.5c accuracy from -10c to +85cmeasures temperatures from -55c to +125c (-67f to +257f) 9- to 12-bit user-configurable resolution1-wire interface requires

3、 only one port pin for communication has a 64-bit unique and unchangeable electronic serial numbermulti-drop capability for simplified distributed temperature sensing alarm function with user-defined nonvolatile alarm settings converts temperature to 12-bit digital word in 750ms (max.)no external co

4、mponents required to sense temperature 3.0v to 5.5v supply rangeoptional parasite-power operation (power derived directly from 1-wire bus)8-pin max/sop (ds18b20u), 3-pin to-92 (ds18b20), and 150mil 8-pin so (ds18b20z)packages应用：农用系统、音频设备、汽车、气象控制、gps 设备、硬盘驱动器、医疗装置、机顶盒、电信“”“”at the end, xiao bian give

5、s you a passage. minand once said, people who learn to learn are very happy people. in every wonderful life, learning is an eternal theme. as a professional clerical and teaching position, i understand the importance of continuous learning, life is diligent, nothing can be gained, only continuous learning can achieve better self. only by constantly learning and mastering the latest relevant knowledge, can employees from all walks of life keep up with the pace of enterprise development and innovate to meet the needs of the market. this document is also edited by my studio profes