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1、ADIADXL362微功耗三轴MEMS加速度计解决方案关键字：工业控制,MEMS,加速度计ADI公司的ADXL362是微功耗三轴MEMS加速度计,数字输出,加速度范围为±2/±4/±8g,工作电压1.8V-3.3V,电源电压2V和100Hz输出数据速率时的功耗为2μA,运动触发叫醒模式的功耗为300nA,器件提供12位输出分辨率,8位格式的数据,在±2g范围的分辨率为1mg/LSB,主要用在助听器,家庭保健设备,运动使能电源开关,无线传感器和运动使能计量设备.本文介绍了ADXL362主要特性,ADXL362功能方框图以及评估板EVAL-ADXL362Z主要特性和电路图.A
2、DXL362: Micropower3-AxisMEMSAccelerometer:DigitalOutput,±2/±4/±8gRange TheADXL362isanultra-lowpower3-axisMEMSaccelerometerthatconsumeslessthan2μAata100Hzoutputdatarate,and300nAinmotion-triggeredWake-UpMode.Unlikeaccelerometersthatusepowerdutycyclingtoachievelowpowerconsumption,theADXL362d
3、oesnotaliasinputsignalsbyundersampling;itsamplesthesensor’sfullbandwidthatalldatarates.TheADXL362alwaysprovides12-bitoutputresolution;8-bitformatteddataisalsoprovidedformoreefficientsingle-bytetransferswhenalowerresolutionissufficient.Measurementrangesof±2g,±4g,and±8gareavailable,withares
4、olutionof1mg/LSBonthe±2grange.ForapplicationswhereanoiselevellowerthantheADXL362’snormal550μg/7Hzisdesired,eitheroftwolowernoisemodes(downto175μg/7Hztyp)maybeselectedatminimalincreaseinsupplycurrent.Inadditiontoitsultra-lowpowerconsumption,theADXL362hasmanyfeaturestoenabletruesystem-level
5、powerreduction.ItincludesadeepmultimodeoutputFIFO,abuilt-inmicropowertemperaturesensor,andseveralactivitydetectionmodesincludingadjustable-thresholdsleepandwakeupoperationthatcanrunaslowas300nAata6Hz(approximate)measurementrate.Apinoutputisprovidedtodirectlycontrolanexternalswitchwhenacti
6、vityisdetectedifdesired.Inaddition,theADXL362hasprovisionsforexternalcontrolofsamplingtimeand/oranexternalclock.TheADXL362operatesonawide1.6Vto3.6Vsupplyrange,andcaninterface,ifnecessary,toahostoperatingonaseparate,lowersupplyvoltage.TheADXL362isavailableina3mm×3.25mm×1.06mmpackage.ADXL36
7、2主要特性:UltralowpowerPowercanbederivedfromcoincellbattery1.8μA@100HzODR,2.0Vsupply3.0μA@400HzODR,2.0Vsupply300nAmotion-activatedWake-upMode10nAStandbyCurrentBuilt-infeaturesforsystem-levelpowersavings:Adjustable-thresholdsleep/wakemodesformotionactivationAutonomousint
