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        無線(xian)以單片機mPSD3254BV 為核心，通過掃描子系統可以掃描一維或二維條型碼，鍵盤和顯示系統方便用戶進行人機交流，無線傳送模塊可以將現場采集到的數據發送到其它設備，同時條碼掃描器也能存儲上萬條數據信息，整個系統采用鋰電池供電，可以連續工作40小時，當采集數據異常狀態時，系統會自動蜂鳴，振動提醒用戶。

電(dian)源電(dian)路(lu)設(she)計

        電(dian)(dian)(dian)(dian)(dian)(dian)源模塊(kuai)由兩部(bu)分組(zu)成，1AH的(de)(de)鋰(li)電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)和(he)電(dian)(dian)(dian)(dian)(dian)(dian)源穩(wen)壓(ya)芯(xin)片(pian)MAX604。MAX604芯(xin)片(pian)是(shi)一(yi)種(zhong)低(di)(di)壓(ya)差、低(di)(di)功耗線性(xing)穩(wen)壓(ya)器(qi)，用(yong)來(lai)保(bao)證(zheng)系統工作(zuo)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)的(de)(de)穩(wen)定。鋰(li)電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)隨(sui)著使(shi)用(yong)時(shi)間(jian)的(de)(de)增(zeng)加(jia)，電(dian)(dian)(dian)(dian)(dian)(dian)量將(jiang)會逐漸(jian)降低(di)(di)，不能有效保(bao)證(zheng)系統穩(wen)定工作(zuo)。因此在鋰(li)電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)后端加(jia)一(yi)片(pian)MAX604，電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)始終穩(wen)定在3.3V。MAX604芯(xin)片(pian)上(shang)的(de)(de)OFF端，可以用(yong)來(lai)控制穩(wen)壓(ya)芯(xin)片(pian)是(shi)否輸出電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)。當OFF端上(shang)是(shi)高電(dian)(dian)(dian)(dian)(dian)(dian)平“1”時(shi)，該(gai)模塊(kuai)就有輸出電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)；當OFF端上(shang)是(shi)低(di)(di)電(dian)(dian)(dian)(dian)(dian)(dian)平“0”時(shi)，該(gai)模塊(kuai)就無輸出電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)。本(ben)系統利用(yong)這(zhe)一(yi)個特性(xing)，實(shi)現電(dian)(dian)(dian)(dian)(dian)(dian)源的(de)(de)開(kai)關和(he)休眠(mian)的(de)(de)喚醒。

鍵盤輸入模塊

        共(gong)設(she)計28個(ge)(ge)按(an)(an)鍵(jian)；將(jiang)mPSD3200單片機的PA，PB口設(she)置(zhi)成普通的I/O接口以構成一個(ge)(ge)行(xing)列(lie)式鍵(jian)盤矩陣。將(jiang)PA0~6設(she)置(zhi)為七根列(lie)線，PB0~3設(she)置(zhi)為四(si)根行(xing)線，并將(jiang)PA7設(she)置(zhi)成邏(luo)輯輸入。用PA7口來檢測列(lie)線上是(shi)否有鍵(jian)按(an)(an)下。當檢測到(dao)有鍵(jian)按(an)(an)下時，PA7向CPU申請(qing)中斷(duan)(duan)，由(you)CPU 來判斷(duan)(duan)具體是(shi)哪個(ge)(ge)鍵(jian)。

LCD顯示模(mo)塊

        顯(xian)(xian)示(shi)液(ye)晶(jing)屏(ping)(ping)采(cai)用KS0741芯片，該(gai)芯片本身(shen)自帶(dai)驅動(dong)(dong)模塊(kuai)(kuai)，驅動(dong)(dong)模塊(kuai)(kuai)與CPU的接口有串行(xing)或并行(xing)兩種控制(zhi)方式(shi)，本掃描器采(cai)用并行(xing)控制(zhi)方式(shi)。該(gai)液(ye)晶(jing)屏(ping)(ping)功耗較低，工作電流僅為毫安(an)級。它可以顯(xian)(xian)示(shi)文(wen)字與圖片，該(gai)液(ye)晶(jing)屏(ping)(ping)*多可以顯(xian)(xian)示(shi)8×16個漢字。能為用戶顯(xian)(xian)示(shi)各種信(xin)息。

        系(xi)統(tong)的(de)主控(kong)制(zhi)芯片(pian)(pian)選用SoC單片(pian)(pian)機(ji)mPSD3254BV。 mPSD3200單片(pian)(pian)機(ji)是ST公司將(jiang)51內(nei)核與PSD（可(ke)(ke)編程系(xi)統(tong)器件）模塊組合在(zai)一(yi)(yi)起的(de)一(yi)(yi)款典(dian)型(xing)的(de)SoC芯片(pian)(pian)。它在(zai)一(yi)(yi)塊芯片(pian)(pian)中集成了(le)8052的(de)內(nei)核，擴展了(le)I/O端口PA~PD，增加(jia)了(le)I2C、USB、PWM、ADC等功能部件和二(er)個UART接口，還(huan)增加(jia)了(le)PLD（可(ke)(ke)編程邏輯器件）的(de)功能；同時片(pian)(pian)內(nei)包(bao)括兩塊大容(rong)量的(de)FLASH存(cun)儲(chu)塊和SRAM存(cun)儲(chu)器，并(bing)可(ke)(ke)根據(ju)實際(ji)需要將(jiang)其配置為數據(ju)存(cun)儲(chu)器或(huo)者程序(xu)存(cun)儲(chu)器來使用。

        想(xiang)知道更多無線條碼掃(sao)描器*新(xin)(xin)相關資訊，請(qing)時(shi)刻(ke)關注東莞立象條碼掃(sao)描器網站查看(kan)其*新(xin)(xin)網站動態(tai)！