简介：采用支持菊链模式的新型数字温度传感器芯片DS28EA00组建的单总线测温网络。无需进行传统的ROM搜索步骤，允许用户将器件在链路中的物理位置与序列号对应，节省了RAM开销，简化了基于单总线的应用设计。
    
基本特点：

DS28EA00数字温度传感器是具有9位(0.5℃)至12位(1/16℃)分辨率和用户可编程非易失性(NV)上、下触发点报警功能的数字温度计。每个DS28EA00都具工厂编程的唯一64位序列号。通信时只需一根数据线和地线，就可通过1-Wire?协议串行传输数据。改进型1-Wire接口具有滞回和干扰滤波功能，使得DS28EA00能够在大的1-Wire网络中可靠工作。与其他1-Wire温度计不同，DS28EA00具有两个额外的引脚用以执行顺序检测功能。该特性允许用户将器件在链路中的物理位置与序列号对应，例如，用来测量储存塔不同高度处的温度。如果无需顺序检测功能，这些引脚可作为通用输入或输出。DS28EA00能够直接从数据线获取电源进行工作("寄生供电")，因此无需外部电源。

·数字温度计测量范围：-40℃至+85℃

·用户可选择的9至12位温度分辨率

·独特的1-Wire接口，仅需单个引脚即可进行通信

·每个器件都具有在工厂激光刻蚀的唯一64位序列号

·ROM多节点能力简化分布式温度检测应用

·具有滞回和干扰滤波器的改进型1-Wire接口

·用户可定义的非易失性(NV)报警温度设置/用户字节

·报警搜索命令能够快速确定温度超出设定范围的器件

·标准和高速1-Wire通信模式

·2个通用可编程IO (PIO)引脚

·级联功能使用PIO引脚检测器件在网络中的物理顺序

·工作范围：3.0V至5.5V，-40℃至+85℃

·可由数据线供电

方案特点

The DS28EA00 evaluation system (EV system) consists of a single evaluation kit (EV kit) that includes an evaluation board (EV board) made up of three subsections that can be broken/snapped off into three independently exercisable boards. Since one of the major features of the DS28EA00 is detection of physical sequence, a block of dip switches are provided on each subsection of the EV board to re-order the physical connection between the chips. Optionally, the customer can break off the subsections of the eval board, connect them together with the provided cables, and re-order the physical sequence of the DS28EA00s that way.

Easy Setup 

Stand-Alone EV Board 

Contains Three Separate, Breakable Subsections with a DS28EA00 Per Subsection 

The Dipswitch Block on Each EV Board Subsection Routes Physical Chain-Mode

Connections Between Chips When Used as a Stand-Alone Board

EV Board’s Subsections are Breakable Into Three Separate Boards Each of Which  Evaluates a Single DS28EA00 or, When Cabled Together, Evaluate Chain-Mode Searching

LEDs Give Visual Indicators of PIO Activity

6-Pin Terminal Strip Allows PIO Testing Outside of Chain Mode

PC Connectivity Included

RoHS Compliant

Free Downloadable Evaluation Software Available

参考原理图 



                                 图1 参考原理图

参考pcb图



                                  图2 参考layout top

  

图3 参考layout bottom



图4： 参考layout composite

详情请见：http://datasheets.maximintegrated.com/en/ds/DS28EA00EVKIT.pdf