飛思卡爾ZSTAR3無線傳感器參考設計

飛思卡爾ZSTAR3無線傳感器參考設計飛思卡爾(Freescale)公司的ZSTAR3無線傳感器參考設計支持數(shù)字和模擬加速度計,并能通過RFZigBee®2.4GHz通信模塊,和到連接PC的USB節(jié)點進行通信.ZSTAR3中主要的器件包括三軸模擬加速度計MMA7361L,三軸數(shù)字加速度計MMA745xL和系統(tǒng)級封裝(SiP)MC13213.本文介紹了ZSTAR3無線傳感器參考設計主要元件的主要特性,傳感器板方框圖以及采用模擬傳感器與數(shù)字傳感器的傳感器板材料清單和ZSTAR3參考設計電路圖.

Multiplewirelesssensingtriple-axisreferencedesign

TheZSTAR3systemaccommodatesmultipleanaloganddigitalaccelerometerboards,

connectedthroughanRFZigBee®2.4GHzcommunicationtoasingleUSBnodeconnectedtoaPC.Theaccelerometerboardsmeasureaccelerationinthreeaxesusingapincompatibledigitalor,optionally,ananalogsensor.Thesensorsensitivityisdefinedbytheselectedaccelerometer.TheUSBnodeispartoftheZSTARdesign,equippedwithdedicatedsoftwaresupportingmultiplenodes.

TheZSTAR3projectoffersanewPCsoftwareinterfacethatshowsallthebasicaccelerometerfunctionsandutilizations.Freescale’sRD3172MMA7456LZSTAR3canhelpyoustreamlineyoursolutionwiththeconvenienceofmotionandwirelesscontrol.TheZSTAR3isasmallportableboarddesignthatutilizesthefollowingproducts:

MMA7361LanalogorMMA7456Ldigitaltriple-axisaccelerometer

MC1321x2.4GHzlow-powertransceiversandanS08MCUinonepackage

目標應用:

TheZSTAR3designprovidessmallportableboardswiththecapacitytodemonstrateand

evaluatevariousaccelerometerapplicationsthataccommodateacost-effective,low-powerwirelessconnection.Applicationsinclude:

Mobilephones

Handheldgamingdevices

Portablemediaplayers

MP3players

PDAs

Personalcomputerperipherals

GPSnavigationdevices

Healthcaredevices

Toys

Robotics

圖1.ZSTAR3參考設計外形圖

ZSTAR3參考設計支持的主要器件:

1)三軸模擬加速度計MMA7361L

TheMM7361LTisalowpower,lowprofilecapacitivemicromachinedaccelerometerfeaturingsignalconditioning,a1-polelowpassfilter,temperaturecompensation,selftest,0g-detectwhichdetectslinearfree-fall,andg-Selectwhichallowsfortheselectionbetween2sensitivities.Zero-goffsetandsensitivityarefactorysetandrequirenoexternaldevices.TheMM7361LTincludesasleepmodethatmakesitidealforhandheldbatterypoweredelectronics.

MMA7361L主要特性:

3mmx5mmx1.0mmLGA-14-pinpackage

Lowcurrentconsumption:400μA

Sleepmode:3μA

Lowvoltageoperation:2.2V-3.6V

Highsensitivity(800mV/gat1.5g)

Fastturnontime(0.5msenableresponsetime)

Selftestforfree-falldetectdiagnosis

0g-Detectforfree-fallprotection

Signalconditioningwithlowpassfilter

Robustdesign,highshockssurvivability

RoHScompliant

Environmentallypreferredproduct

Lowcost

2)三軸數(shù)字加速度計MMA745xL

TheMMA745xLisadigitaloutput(I2C/SPI),lowpower,3x5x1mmlowprofilepackagecapacitivemicromachinedaccelerometerfeaturingsignalconditioning,alowpassfilter,temperaturecompensation,selftest,configuredtodetect0gthroughinterruptpins(INT1orINT2),andpulse(click)detectforquickmotiondetection.The0goffsetcanbecustomercalibratedusingassigned0gregistersandg-Selectwhichallowsforcommandselectionof3sensitivities(2g/4g/8g).Zero-goffsetandsensitivityarefactorysetand

requirenoexternaldevices.TheMMA745xLincludesastandbymodethatmakesitidealforhandheldbatterypoweredelectronics.

MMA745xL主要特性:

Digitaloutput(I2C/SPI)forprocessorsystemperformance

Low-profile14-pin3mmx5mmx1mmLGApackage

LGAvolumeis71percentsmallerthanaQuadFlatNo-Lead(QFN)package

XYZ:threeaxesofsensitivityinonedevice(2g,4g,8g)

Lowcurrentconsumption

Standbymode:5μA

Low-voltageoperation:2.4V-3.6V

Customerassignedregistersforoffsetcalibration

Programmablethresholdinterruptoutput

Leveldetectionformotionrecognition(shock,vibration,free-fall)

Singleordoubleclick(pulse)recognition

Highsensitivity

—64LSB/gat2g

—64LSB/gat8gin10-bitmode

3)系統(tǒng)級封裝(SiP)MC13213

TheMC13213SysteminPackage(SiP)integratestheMC9S08GTMCUwiththeMC1320xtransceiverintoasingle9x9mmLGApackage.TheMC13213provides60KFlashmemoryand4KofRAM.ByusingtheIEEE802.15.4CompliantMAC,orBeeStackZigBeeProtocolStack,theMC13213isanidealsolutionforsensingandcontrolapplicationsthatrequiremeshnetworking.

MC13213主要特性:

40MHzHCS08low-voltage,low-powercore

60KBFlashand4KBRAMmemory

SevenaddressingmodesfortheCPU

Multiple16-bittimers

2Vto3.4Voperatingvoltagewithonchipvoltageregulator

-40to+85degreesCoperatingtemperature

Lowexternalcomponentcount

Requiresasingle16MHzcrystal

ProgrammablefrequencyclockoutputforMCU

Auto-trimfeatureforcrystalaccuracy

Eliminatestheneedforexternalvariablecapacitors

Allowsforautomatedproductionfrequencycalibration

9x9x1mm71-pinLGApackage

圖2.傳感器板方框圖

表1.傳感器板材料清單(采用模擬傳感