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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。

電源(yuan)電路設(she)計

        電(dian)(dian)(dian)(dian)源模(mo)塊由兩部分組(zu)成(cheng)，1AH的(de)鋰(li)(li)電(dian)(dian)(dian)(dian)池(chi)和(he)電(dian)(dian)(dian)(dian)源穩(wen)(wen)壓(ya)(ya)(ya)芯片(pian)(pian)MAX604。MAX604芯片(pian)(pian)是(shi)(shi)一種(zhong)低(di)壓(ya)(ya)(ya)差、低(di)功(gong)耗線性(xing)穩(wen)(wen)壓(ya)(ya)(ya)器(qi)，用(yong)(yong)來(lai)保證(zheng)系(xi)統(tong)(tong)工作(zuo)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)的(de)穩(wen)(wen)定。鋰(li)(li)電(dian)(dian)(dian)(dian)池(chi)隨著使(shi)用(yong)(yong)時(shi)(shi)間的(de)增加，電(dian)(dian)(dian)(dian)量將會(hui)逐漸降低(di)，不能有(you)效保證(zheng)系(xi)統(tong)(tong)穩(wen)(wen)定工作(zuo)。因此(ci)在鋰(li)(li)電(dian)(dian)(dian)(dian)池(chi)后(hou)端(duan)(duan)加一片(pian)(pian)MAX604，電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)始終穩(wen)(wen)定在3.3V。MAX604芯片(pian)(pian)上的(de)OFF端(duan)(duan)，可以用(yong)(yong)來(lai)控制(zhi)穩(wen)(wen)壓(ya)(ya)(ya)芯片(pian)(pian)是(shi)(shi)否(fou)輸(shu)出(chu)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)。當OFF端(duan)(duan)上是(shi)(shi)高電(dian)(dian)(dian)(dian)平“1”時(shi)(shi)，該(gai)模(mo)塊就(jiu)有(you)輸(shu)出(chu)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)；當OFF端(duan)(duan)上是(shi)(shi)低(di)電(dian)(dian)(dian)(dian)平“0”時(shi)(shi)，該(gai)模(mo)塊就(jiu)無輸(shu)出(chu)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)。本系(xi)統(tong)(tong)利用(yong)(yong)這一個(ge)特性(xing)，實現電(dian)(dian)(dian)(dian)源的(de)開關和(he)休眠(mian)的(de)喚醒。

鍵(jian)盤輸入(ru)模塊(kuai)

        共(gong)設(she)計(ji)28個(ge)按鍵；將(jiang)mPSD3200單片機的PA，PB口設(she)置(zhi)成普通的I/O接口以構(gou)成一個(ge)行列式鍵盤矩(ju)陣(zhen)。將(jiang)PA0~6設(she)置(zhi)為七(qi)根(gen)列線，PB0~3設(she)置(zhi)為四根(gen)行線，并將(jiang)PA7設(she)置(zhi)成邏輯輸(shu)入。用PA7口來檢(jian)(jian)測列線上是(shi)否有鍵按下(xia)。當檢(jian)(jian)測到有鍵按下(xia)時(shi)，PA7向CPU申請(qing)中斷，由CPU 來判斷具體是(shi)哪個(ge)鍵。

LCD顯示(shi)模塊

        顯(xian)示(shi)液(ye)晶(jing)屏(ping)采(cai)用(yong)KS0741芯片(pian)，該芯片(pian)本(ben)身(shen)自(zi)帶驅(qu)動模(mo)塊，驅(qu)動模(mo)塊與CPU的接口(kou)有串行或并(bing)行兩種(zhong)控(kong)(kong)制方式，本(ben)掃描(miao)器采(cai)用(yong)并(bing)行控(kong)(kong)制方式。該液(ye)晶(jing)屏(ping)功耗較低(di)，工作電流僅為毫(hao)安級。它可以顯(xian)示(shi)文字與圖(tu)片(pian)，該液(ye)晶(jing)屏(ping)*多可以顯(xian)示(shi)8×16個(ge)漢字。能為用(yong)戶顯(xian)示(shi)各種(zhong)信息。

        系統的(de)主(zhu)控制芯片(pian)選(xuan)用SoC單片(pian)機(ji)mPSD3254BV。 mPSD3200單片(pian)機(ji)是ST公司(si)將(jiang)51內(nei)(nei)(nei)核(he)與PSD（可編程(cheng)(cheng)(cheng)系統器(qi)(qi)件）模塊組合在(zai)一(yi)起(qi)的(de)一(yi)款典型的(de)SoC芯片(pian)。它在(zai)一(yi)塊芯片(pian)中集成了(le)8052的(de)內(nei)(nei)(nei)核(he)，擴展了(le)I/O端口PA~PD，增加了(le)I2C、USB、PWM、ADC等(deng)功能部(bu)件和(he)二(er)個(ge)UART接口，還增加了(le)PLD（可編程(cheng)(cheng)(cheng)邏輯(ji)器(qi)(qi)件）的(de)功能；同時片(pian)內(nei)(nei)(nei)包括(kuo)兩塊大容(rong)量的(de)FLASH存儲塊和(he)SRAM存儲器(qi)(qi)，并可根據(ju)(ju)實(shi)際需要(yao)將(jiang)其配置為(wei)數據(ju)(ju)存儲器(qi)(qi)或者(zhe)程(cheng)(cheng)(cheng)序存儲器(qi)(qi)來(lai)使用。

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