6DD1640-0AH0
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6DD1640-0AH0
溫度采集單元的實(shí)現(xiàn)
溫度采集單元主要溫度信號(hào)的實(shí)時(shí)采樣并響應(yīng)主機(jī)的命令[31。本系統(tǒng)溫度傳感器使用DS1 8B20,DS1 8B28B20是美國半導(dǎo)體DALLAS公司推出的單總線溫度傳感器。該器件具有體積小、結(jié)構(gòu)簡單、實(shí)用電壓寬、可組網(wǎng)、成本低廉、便于總線擴(kuò)展和維護(hù)等諸多優(yōu)點(diǎn),而且內(nèi)有控制電路,收發(fā)電路和存儲(chǔ)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(shí)現(xiàn)溫度信號(hào)的9~12位的數(shù)字轉(zhuǎn)換,分辨率zui高可以達(dá)到0.0625℃。其測量溫度范圍為-55~+125℃,其中,在-10~+85℃范圍內(nèi),精度能夠達(dá)到±0.5℃。器件采用CMOS技術(shù),耗電量很小,能夠直接讀出被測溫度并且可根據(jù)實(shí)際要求通過簡單的編程實(shí)現(xiàn)一位分辨率的數(shù)字值讀數(shù)方式。使用微處理器作為控制機(jī)時(shí),可以使用一位普通端口,就可驅(qū)動(dòng)傳感器芯片,本系統(tǒng)采用GPB7引腳來驅(qū)動(dòng)DS18B20。由于DS1 8B20是通過一條數(shù)據(jù)線傳輸數(shù)據(jù), 這樣整個(gè)系統(tǒng)要嚴(yán)格按該器件單總線協(xié)議規(guī)定的時(shí)序進(jìn)行工作, 所以DS 1 8B20有嚴(yán)格的通信協(xié)議來保證各個(gè)數(shù)據(jù)傳輸?shù)恼_性和完整性。根據(jù)DS 1 8B20的通訊協(xié)議,主機(jī)控制DS 1 8B20完成溫度轉(zhuǎn)換時(shí),首先在每一次讀寫之前對(duì)DS1 8B20進(jìn)行復(fù)位,復(fù)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(duì)DS18B20進(jìn)行預(yù)定的操作。R O M 操作命令主要是對(duì)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(zhuǎn)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(gòu)成矩陣鍵盤,同時(shí)在芯片內(nèi)部可自動(dòng)完成掃描、譯碼、去抖動(dòng)處理等任務(wù)。
S3C2410A內(nèi)部已經(jīng)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(qū)動(dòng)電路連接,觸摸位置直接用CPU內(nèi)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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