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Maxim的DS28EA00的单总线测温体系

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

根本特色:

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、下触发点报警功用的数字温度计。每个DS28EA00都具工厂编程的仅有64位序列号。通讯时只需一根数据线和地线,就可经过1-Wire?协议串行传输数据。改进型1-Wire接口具有滞回和搅扰滤波功用,使得DS28EA00可以在大的1-Wire网络中牢靠作业。与其他1-Wire温度计不同,DS28EA00具有两个额定的引脚用以履行次序检测功用。该特性答运用户将器材在链路中的物理方位与序列号对应,例如,用来丈量贮存塔不同高度处的温度。假如无需次序检测功用,这些引脚可作为通用输入或输出。DS28EA00可以直接从数据线获取电源进行作业(寄生供电),因而无需外部电源。

·数字温度计丈量规模:-40℃至+85℃

·用户可选择的9至12位温度分辨率

·共同的1-Wire接口,仅需单个引脚即可进行通讯

·每个器材都具有在工厂激光刻蚀的仅有64位序列号

·ROM多节点才能简化分布式温度检测运用

·具有滞回和搅扰滤波器的改进型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

·报警查找指令可以快速确认温度超出设定规模的器材

·规范和高速1-Wire通讯形式

·2个通用可编程IO (PIO)引脚

·级联功用运用PIO引脚检测器材在网络中的物理次序

·作业规模:3.0V至5.5V,-40℃至+85℃

·可由数据线供电

计划特色

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

参阅原理图

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图1 参阅原理图

参阅pcb图

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图2 参阅layout top

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图3 参阅layout bottom

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图4: 参阅layout composite

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