微控制器與加速度通信

CN-3軸、±2g/±4g/±8g/±16g欲獲 利用精密模擬微控制器ADuC7024和達(dá)±16g的加速度進(jìn)行高分辨率（13位）測(cè)量。數(shù)字輸出數(shù)ADXL345等數(shù)字輸出加速度計(jì)時(shí)，無(wú)需進(jìn)行

ADXL345內(nèi)置多種功能?；顒?dòng)/非活動(dòng)檢測(cè)、單擊/雙擊檢測(cè)計(jì)算。內(nèi)置32級(jí)FIFO緩沖器可以減輕主機(jī)處理器的負(fù)測(cè)功能，將ADXL345用作“運(yùn)動(dòng)開(kāi)關(guān)”（無(wú)活動(dòng)時(shí)關(guān)閉整ADXL345通過(guò)I2C或SPI接口進(jìn)行通信。本文所述電路演示如“CircuitsfromtheLab”fromogDeviceshavebeendesignedandbuiltbyogDevicesengineers.Standardengineeringpracticeshavebeenemployedinthedesignandconstructionofeachcircuit,andtheirfunctionandperformancehavebeentestedandverifiedinalabenvironmentatroomtemperature.However,youaresolelyresponsiblefortestingthecircuitanddeterminingitssuitabilityandapplicabilityforyouruseandapplication.Accordingly,innoeventshallogDevicesbeliablefordirect,indirect,special,al,consequentialorpunitivedamagesduetoanycausewhatsoeverconnectedtotheuseofany“CircuitfromtheLab”.(onlastpage)

Fax: ogDevices,Inc.All CN-CN- 本電路將精密模擬微控制器ADuC7024和數(shù)字加速度計(jì)ADXL345配合使用。兩款器件均支持I2C和SPI接口。圖1顯示ADXL345和ADuC7024的SPI2顯示這些器件的I2C配置。CS引腳（ADXL3457）用來(lái)選擇所需的接口。如果CS引腳連接高電平(VDDI/O)，則I2C模式使能。在果CS被拉高，則表示沒(méi)有SPI傳輸發(fā)生，或者I2C傳輸可能發(fā)鈕，用于微控制器編程。SW1是電源開(kāi)關(guān)。.

1顯示了ADXL3454線(xiàn)式SPI3線(xiàn)式SPI進(jìn)行通信。圖3顯示了這種配置。上述電路采用ADuC7024微控制器。同樣的配置可以適用于和SPI連接。表1列出了兩種協(xié)議的引腳功能。7電路筆電路筆 CN-圖4.SPI（左）和I2C（右）ThiscircuitisusedintheADXL345DevelopmentBoard(modelnumberEVAL-ADXL345Z-DB).ForinformationonADXL345operationandregisterfunctions,pleaserefertotheADXL345datasheet.ForinformationonprogrammingtheADuC7024,pleaseseetheADuC7024datasheet.SamplecodefortheI2CconfigurationshowninFigure2isavailableathtt ADXL345DataSheetADXL345EvaluationToolsADuC7024DataSheet(fromfirstpage)"CircuitsfromtheLab"areintendedonlyforusewithogDevicesproductsandaretheinlectualpropertyofogDevicesoritslicensors.Whileyoumayusethe"CircuitsfromtheLab"inthedesignofyourproduct,nootherlicenseisgrantedbyimplicationorotherwiseunderanypatentsorotherinlectualpropertybyapplicationoruseofthe"CircuitsfromtheLab".InformationfurnishedbyogDevicesisbelievedtobeaccurateandreliable.However,"CircuitsfromtheLab"are ogDevicesfortheiruse,norforanyinfringementsofpatentsorotherrightsofthirdpartiesthatmayresu