6DD1640-0AH0
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6DD1640-0AH0
溫度采集單元的實現
溫度采集單元主要溫度信號的實時采樣并響應主機的命令[31。本系統(tǒng)溫度傳感器使用DS1 8B20，DS1 8B28B20是美國半導體DALLAS公司推出的單總線溫度傳感器。該器件具有體積小、結構簡單、實用電壓寬、可組網、成本低廉、便于總線擴展和維護等諸多優(yōu)點，而且內有控制電路，收發(fā)電路和存儲電路等。DS18B20 具有較寬的電壓適用范圍(3～5．5V)，并能夠通過編程實現溫度信號的9～12位的數字轉換，分辨率zui高可以達到0．0625℃。其測量溫度范圍為-55～+125℃，其中，在-10～+85℃范圍內，精度能夠達到±0．5℃。器件采用CMOS技術，耗電量很小，能夠直接讀出被測溫度并且可根據實際要求通過簡單的編程實現一位分辨率的數字值讀數方式。使用微處理器作為控制機時，可以使用一位普通端口，就可驅動傳感器芯片，本系統(tǒng)采用GPB7引腳來驅動DS18B20。由于DS1 8B20是通過一條數據線傳輸數據， 這樣整個系統(tǒng)要嚴格按該器件單總線協(xié)議規(guī)定的時序進行工作， 所以DS 1 8B20有嚴格的通信協(xié)議來保證各個數據傳輸的正確性和完整性。根據DS 1 8B20的通訊協(xié)議，主機控制DS 1 8B20完成溫度轉換時，首先在每一次讀寫之前對DS1 8B20進行復位，復位成功后發(fā)送一條ROM指令，然后發(fā)送RAM 指令，這樣才能對DS18B20進行預定的操作。R O M 操作命令主要是對傳感器地址的操作。RAM 指令主要完成溫度的測量，主要有讀寄存器，寫寄存器，溫度轉換等操作。
2．4 鍵盤及LCD顯示單元
系統(tǒng)采用SPI接口的鍵盤控制芯片ZLG 72 8與$3C2410A的SPI接口連接，ZLG7289掃描的行線R[2：0】和列線C[7：0】構成矩陣鍵盤，同時在芯片內部可自動完成掃描、譯碼、去抖動處理等任務。
S3C2410A內部已經集成了LCD 控制器，因此可以很方便地控制各種類型的LCD屏，例如：STN和TFT屏。系統(tǒng)采用Samsung 3．5 反射型TFT液晶LTS350Q1，320 X 240像素，256k色，White LED背光，自帶四線式觸摸屏，可以直接和S3C2410A的觸摸屏驅動電路連接，觸摸位置直接用CPU內置的ADC電路采樣可得。
鍵盤和LCD連接示意圖如圖2所示。
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Single and Ribbon Fiber
