6DD1684-0GE0

6DD1684-0GE0

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廈門莫格電氣自動化有限公司

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本

微控制器的一個雙向引腳與CC1020的DIO連接,用于數(shù)據(jù)的發(fā)射與接收(輸入與輸出)。DCLK提供數(shù)據(jù)定時,必須連接到微控制器的一個輸入端。

數(shù)據(jù)輸出可以選擇使用單獨的引腳。這時要設(shè)置CC1020的INTERFACE寄存器SEP_DI_DO=1。在同步模式下,LOCK引腳用作數(shù)據(jù)輸出,而DCLK引腳作為異步模式的數(shù)據(jù)輸出,DIO引腳端則只用于數(shù)據(jù)輸入。

微控制器的一個引腳可用來相環(huán)的鎖定信號,即LOCK引腳信號。當(dāng)鎖相環(huán)鎖定時,LOCK引腳為邏輯低電平。它還可以用作載波檢測及它內(nèi)部測試信號。

CC1020能被設(shè)置成三種不同的數(shù)據(jù)傳輸形式：同步NRZ模式、同步曼徹斯現(xiàn)難度也介于兩者之間?？紤]到微處理器基本都支持UART串行通訊,所以選擇了這種模式,經(jīng)測試效果完*達(dá)到要求。

CC1020天線選擇

CC1020可以使用多種型號的天線。近程通信中常使用的天線是單極天線、螺旋型天線和環(huán)形天線。本設(shè)計使用范圍且簡單的1/4波長單極天線。

電源管理

CC1020提供了非常靈活的電源管理,以適應(yīng)電池驅(qū)動應(yīng)用中對功耗的嚴(yán)格要求。低功耗模式通過MAIN寄存器和POWERDOWN寄存器控制。MAIN寄存器中有獨立的位,用于控制接收部分、發(fā)射部分、頻率合成器和晶振。這種獨立控制方式使得各個應(yīng)用的功耗可以優(yōu)化為zui小。由于本設(shè)計是單獨的無線通信模塊,所以對功耗要求不太嚴(yán)格。系統(tǒng)采用5V供電,經(jīng)過NCP500穩(wěn)定輸出3V電壓。

抗干擾措施

無線射頻收發(fā)系統(tǒng)對電源噪聲很敏感,因此設(shè)計時采用了無線射頻部分和其它電路分開供電的方法。高頻器件對于噪聲敏感,因此給各部分電源加裝了濾波器或穩(wěn)壓器,以減少電源噪聲對芯片的干擾。另外,對芯片使用電源監(jiān)控及看門狗電路,以便大幅度提高整個電路的抗干擾性能。

Chipcon公司提供了射頻部分的電路參考設(shè)計,射頻部分的布局參照了參考設(shè)計的布局,同時根據(jù)實際情況做了一些改動,以獲得效果。CC1020的外圍元件很少,其中VCO電感屬于關(guān)鍵器件,選用了高精度電感,布局上也盡可能靠近芯片,并且盡可能使兩個輸入引腳對稱,以保證性能。另外,設(shè)計時讓晶振與芯片引腳盡量靠近,并用地線把時鐘區(qū)隔離起來,晶振外殼接地并固定,還使用了金屬罩對射頻部分進(jìn)行了電磁屏蔽。使用以上措施,保證了系統(tǒng)的可靠運行。

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