IC693PWR328
IC693PWR328
嵌入式指紋采集系統(tǒng)組成
具有提示信息的指紋識別裝置包括處理器,系統(tǒng)結構圖如圖1 所示。處理器以不同的接口分別連接LCD 漢字顯示屏、指紋傳感器、JTAG 調(diào)試接口、復位電路、外部SRAM 數(shù)據(jù)存儲器、串口及USB 接口;電源管理模塊為上述各部分中的芯片和電路提供電源管理。其中,漢字顯示屏用來顯示指紋圖像初始評估的結果,提示用戶手指的放置是否正確、若不正確如何修正;指紋傳感器用來獲取手指的指紋圖像信息;JTAG 調(diào)試接口用來與上位機連接進行調(diào)試;復位電路用來初始化指紋識別裝置;FLASH 程序存儲器用來存儲指紋識別裝置運行的程序;外部SRAM 數(shù)據(jù)存儲器用來存儲指紋識別裝置運行過程中產(chǎn)生的臨時數(shù)據(jù);串口和USB 接口用于與上位機的連接通信;安全控制器是指紋識別裝置的核心,控制指紋識別裝置的運行。
圖1 指紋采集系統(tǒng)結構圖
指紋專用芯片,是指內(nèi)嵌指紋識別技術的芯片產(chǎn)品,能夠片上實現(xiàn)指紋的圖像采集、特征提取、特征比對的芯片,使開發(fā)過程變得簡單,開發(fā)者可以方便的實現(xiàn)指紋識別的功能,同時芯片價格適中,利于普及使用。
IC693PWR328
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