飞思卡尔ZSTAR3无线传感器参考设计

飞思卡尔ZSTAR3无线传感器参考设计飞思卡尔(Freescale)公司的ZSTAR3无线传感器参考设计支持数字和模拟加速度计,并能通过RFZigBee®2.4GHz通信模块,和到连接PC的USB节点进行通信.ZSTAR3中主要的器件包括三轴模拟加速度计MMA7361L,三轴数字加速度计MMA745xL和系统级封装(SiP)MC13213.本文介绍了ZSTAR3无线传感器参考设计主要元件的主要特性,传感器板方框图以及采用模拟传感器与数字传感器的传感器板材料清单和ZSTAR3参考设计电路图.

Multiplewirelesssensingtriple-axisreferencedesign

TheZSTAR3systemaccommodatesmultipleanaloganddigitalaccelerometerboards,

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

TheZSTAR3projectoffersanewPCsoftwareinterfacethatshowsallthebasicaccelerometerfunctionsandutilizations.Freescale’sRD3172MMA7456LZSTAR3canhelpyoustreamlineyoursolutionwiththeconvenienceofmotionandwirelesscontrol.TheZSTAR3isasmallportableboarddesignthatutilizesthefollowingproducts:

MMA7361LanalogorMMA7456Ldigitaltriple-axisaccelerometer

MC1321x2.4GHzlow-powertransceiversandanS08MCUinonepackage

目标应用:

TheZSTAR3designprovidessmallportableboardswiththecapacitytodemonstrateand

evaluatevariousaccelerometerapplicationsthataccommodateacost-effective,low-powerwirelessconnection.Applicationsinclude:

Mobilephones

Handheldgamingdevices

Portablemediaplayers

MP3players

PDAs

Personalcomputerperipherals

GPSnavigationdevices

Healthcaredevices

Toys

Robotics

图1.ZSTAR3参考设计外形图

ZSTAR3参考设计支持的主要器件:

1)三轴模拟加速度计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)三轴数字加速度计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)系统级封装(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

图2.传感器板方框图

表1.传感器板材料清单(采用模拟传感