Maxim的DS28EA00的單總線(xiàn)測溫系統
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基本特點(diǎn)：
本文引用地址：http://dyxdggzs.com/article/201610/308933.htmDS28EA00數字溫度傳感器是具有9位(0.5℃)至12位(1/16℃)分辨率和用戶(hù)可編程非易失性(NV)上、下觸發(fā)點(diǎn)報警功能的數字溫度計。每個(gè)DS28EA00都具工廠(chǎng)編程的唯一64位序列號。通信時(shí)只需一根數據線(xiàn)和地線(xiàn)，就可通過(guò)1-Wire?協(xié)議串行傳輸數據。改進(jìn)型1-Wire接口具有滯回和干擾濾波功能，使得DS28EA00能夠在大的1-Wire網(wǎng)絡(luò )中可靠工作。與其他1-Wire溫度計不同，DS28EA00具有兩個(gè)額外的引腳用以執行順序檢測功能。該特性允許用戶(hù)將器件在鏈路中的物理位置與序列號對應，例如，用來(lái)測量?jì)Υ嫠煌叨忍幍臏囟?。如果無(wú)需順序檢測功能，這些引腳可作為通用輸入或輸出。DS28EA00能夠直接從數據線(xiàn)獲取電源進(jìn)行工作(寄生供電)，因此無(wú)需外部電源。
·數字溫度計測量范圍：-40℃至+85℃
·用戶(hù)可選擇的9至12位溫度分辨率
·獨特的1-Wire接口，僅需單個(gè)引腳即可進(jìn)行通信
·每個(gè)器件都具有在工廠(chǎng)激光刻蝕的唯一64位序列號
·ROM多節點(diǎn)能力簡(jiǎn)化分布式溫度檢測應用
·具有滯回和干擾濾波器的改進(jìn)型1-Wire接口
·用戶(hù)可定義的非易失性(NV)報警溫度設置/用戶(hù)字節
·報警搜索命令能夠快速確定溫度超出設定范圍的器件
·標準和高速1-Wire通信模式
·2個(gè)通用可編程IO (PIO)引腳
·級聯(lián)功能使用PIO引腳檢測器件在網(wǎng)絡(luò )中的物理順序
·工作范圍：3.0V至5.5V，-40℃至+85℃
·可由數據線(xiàn)供電
方案特點(diǎn)
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
參考原理圖
圖1 參考原理圖
參考pcb圖
圖2 參考layout top
圖3 參考layout bottom
圖4： 參考layout composite
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