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A03B-0819-C152 DS1620是一片8引腳的片內建有溫度測量并轉換為數字值的集成電路，他集溫度傳感、溫度數據轉換與傳輸、溫度控制等功能于一體。測溫范圍：－55～＋125℃，精度為0．5℃。該芯片非常容易與單片機連接，實現溫度的測控應用，單獨做溫度控制器使用時，可不用外加其他輔助元件。

其中：RST，CLK／CONV及DQ為三線串行通信線；DQ為數據輸入輸出端。當RST保持高電平，對應CLK／CONV時鐘脈沖的上升沿處，DQ可按位輸入各種控制指令及數據，在CLK／CONV時鐘脈沖的下降沿處開始按位輸出9 B溫度值，分2個字節輸出，位（LSB）在最先輸出，先輸出的1個字節（8 B）除以2就是攝氏溫度值，后輸出的1個字節（僅1 B）為溫度的符號位，是0為正，是1為負。RST為低電平時結束通信，CLK／CONV保持低電平，DQ呈現高阻態，但芯片內部在進行溫度的測量與數字轉換（即溫度值的更新），這需要大約1 s的時間。

引腳THIGH為高溫臨界觸發輸出端，當所測溫度高于高溫臨界寄存器中設定的溫度TH時，該引腳由低電平變為高電平，而溫度低于TH時又回到低電平；TLOW為低溫臨界觸發輸出端，其電平變化與THIGH類似；TCOM為高／低溫臨界組合觸發輸出端；他們都可作為溫度調節器的輸出端，直接控制加熱或冷卻設備。

DS1620內部有一個工作方式寄存器，如表1所示。

其中：DONE為溫度數據轉換位，為0時表示正，在轉換過程中，為1表示已轉換完畢；THF：高溫標志位，當溫度高于或等于高溫臨界寄存器中的設定值TH時，硬件對該位置位，但硬件不能對該位清零；TLF：低溫標志位，當溫度低于或等于設定值TL時，硬件對該位置位，同樣，硬件不能對該位清零；CPU：CPU使用位，通過軟件對該位清零時，若RST為低電平，則可由CLK／CONV控制溫度數據的轉換，通過軟件對該特定溫度轉換位，若通過軟件對該位置1，則DS1620進行該時刻的溫度轉換，并等待讀取，若該位被置0，則DS1620將不停地進行溫度轉換。

DS1620的工作狀態都是由外部輸入的指令來控制的，具體的指令如下：

AAH讀取轉換好的溫度數據；從指令輸入后的第9個時鐘（亦稱移位）脈沖開始，將輸出溫度寄存器中的數據。

01H給高溫臨界寄存器寫入TH數據。

02H給低溫臨界寄存器寫入TL數據。

A1H讀高溫臨界寄存器中的TH數據。

A2H讀低溫臨界寄存器中的TL數據。

EEH開始轉換溫度數據。

22H停止轉換溫度數據。

0CH寫工作方式寄存器。

ACH寫工作方式寄存器。

2電路設計

如圖2所示，單片機P3．3～P3．5與DS1620按三線通信方式相連，P1口輸出七段碼，P3．0～P3．2通過驅動三極管接到共陽數碼管的COM端，3個按鍵在P3．7的配合下提供功能擴展。

3程序設計

程序的流程圖如圖3所示，各程序模塊均為子程序及嵌套有子程序的調用，其中讀、寫DS1620模塊模塊為子程序，完成1個字節的溫度值或指令的讀寫；按鍵服務模塊主要完成對高／低溫臨界寄存器中TH、TL值的改寫。

下面給出寫／讀DS1620、配置DS1620、開始轉換、讀取溫度等5個子程序的匯編語言程序，其余模塊及程序不再贅述。

A03B-0819-C152
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