半导体加速度传感器在电子称重系统中的应用

Freescale(MCU/DSP/Sensor):[e-mail]0138236883507060B245180401.32.33.74.125.146.147.158.169.202MMA6260QMMA62××QMEMSFreescaleLowGMMA6260QFreescaleMC68HC908AP64A/D31411234PN4WheatstoneA/DADC1221.2.3.34θ3θGPFPFGPF41234PNABOHCXYGPF123FθGGFsinθGkθcos/WWMR+=1WRWMθkkkθGFθMMA6260QgXYcosθ4ABCθABACXYABACAHBCAOgAHsinθgsinθgXY4g/aaθsin2Y2X+=222Y2Xg/)a(a-1θcos+=3aXaYXYaXaY0gaXaY13θ1θ2θ0θ0θ1θ0θ1≤θ0≤θ2θ0θ0θ2θ0θ1θ25θ1θ2θ1θ2OIMLIII2.5Kg1/300000.1g1gLC-A-BA1LC-A-BA1RatedcapacityKg3SensitivitymV/V2.0±10%Nonlinearity%FS0.015Hysteresis%FS0.015Repeatability%FS0.015Creep%FS/30min0.015Zerobalance%FS1Zerotemperaturecoefficient%FS/100.015Ratedoutputtemperaturecoefficient%FS/100.015Temperaturecompensationrange-10-+50Safetemperaturerange-30-+70InputresistanceΩ410±20OurputresistanceΩ350±5InsulationresistanceMΩ2000SupplyvoltageVDC3-15Safeoverload%FS120RS-232CRS-4856569MMA6260QFreescaleMC68HC908AP64RS-232C1.7FreescaleLowGMMA6260QMMA6260QLowG1.5gMMA6260Q800mV/g0g1/21%FSOMMA6260QMMA6260QSTSTMMA6260Q3.3VMC68HC908AP645VMC68HC908AP64PTC6STPTC63.3V5V3.3V0.5gMMA6260QMMA6260QMMA6260Q17Hz17dBMAXIMMAX4244Beyond-the-RailsRail-to-RailMAX42441/23.3VMMA6260QMAX4244AMEAME8800AEFT300mAAME8800AEFTMC68HC908AP64ADCADCMMA6260QADCADC2.FreescaleMC68HC908AP648MHz32KHzPhase-lock-loop62,368FLASH2,048RAM716PWMSCISerialcommunicationsinterfacemodulePCSPISerialperipheralinterfacemoduleSPIMMIICMulti-masterIICI2C810ADC832I/OMC68HC908AP64MC68HC908AP64MC68HC908AP644.9152MHz32.768KHzMC68HC908AP64COPFreescaleROMMON08FreescaleMC68HC908AP64SPISCIMMIICSPIMC68HC908AP64SPIMC68HC908AP64MC68HC908AP64SCIRS-232CMC68HC908AP64MMIICI2CI2CE2PROMMMIICMC68HC908AP64810-bitADCADCADCMC68HC908AP648MC68HC908AP648I/OLED15mAMC68HC908AP641LEDI/O15mALED2I/O3.ADCCMRR8ADC14ADCΣ∆ADCAnalogDevicesAD7730TI/Burr-BrownADS1210CirrusLogicCS5550ADCAD7730AnalogDevices24Σ∆ADC-230,0005nV/2ppm/150dBChopperFASTStepDACAD7730ADCAD77304.9152MHzAD77302.0mV/V5V10mVAD773010mVADCAD773050Hz50Hz50Hz57Hz90dB80,00016.5AD7730+5VAD7730AD7730SCLKDINDOUTCSMC68HC908AP64I/OSPIAD77304.9220V6V-25V26VπNationalSemiconductorLM2940CTLP2954AITICLM2940CTLP2954AITLM2940CT1ALM2940CTLP2954AIT250mALP2954AITΣ∆ADCLP2954AIT5.8LED68LED7×8MAXIMMAX7221864LEDMAX7221SPI5MAX72212MAX7221MAX7221MAX7221MAX7221CLKDINMC68HC908AP64SPCKMOSII/OMAX7221CSMC68HC908AP64SPIMAX72216.94×444MC68HC908AP64167.RS-232CRS-232CMAXIMMAX232RS-23210TTLRS-232ICMC68HC908AP64RXDTXDSCIRS-232C8.CentronicsDB25IEEE1284-ASTROBEDATA1-DATA8ACKBUSYSELECTGNDI/O874HC595DATA1-DATA874HC595Q0-Q7MC68HC908AP64SPI74HC59574HC595SPI9.MicrochipI2CE2PROM24LC01MC68HC908AP64MMIICE2PROM10.EMCEMCElectromagneticCompatibilityPCB(EMC)PCB11.4PCB6789PCB3311101.MAX7221LEDLEDAD7730AD7730AD7730MMA6260Q2.AD77302Kg4n/)m-Q(s=sQADmADn0.1g2Kgn20000WMW5s/)m-P(M=W6)m-Q/(n)m-P(M×=PADs6WMWMWMmsmsE2PROM3.12MMA6260Qcosθ3cosθaX2+aY2aX2+aY23cosθaX2+aY2cosθ4gAHaAH2Y2XAHaaa+=7cosθg/a-gg/)a(a-gθcos2AH22Y2X2=+=8aAHaAHa-g2AH2aAHa-g2AH28aAHaX2aY2NewtoniterationaAHMMA6260QXYaXaY01/2h-AaXX=h-AaYY=9AXAYXYADh1/2ADgADMMA6260Q800mV/g740mV/g860mV/g4.138231kk5.013BCDMAX72211.MMA6260QDataSheetFreescaleSemiconductor,Inc.20042.MC68HC908AP64DataSheetFreescaleSemiconductor,Inc.20033.AD7730/AD7730LDataSheetAnalogDevices,Inc.,19984.MAX4244DataSheetMaximIntegratedProducts,20035.MAX7219/MAX7221DataSheetMaximIntegratedProducts,20036.LP2954/LP2954ADataSheetNationalSemiconductorCorporation19997.AME8800/8811DataSheetAME,Inc.20048.20029.KoichiKameoka[],200014MC68HC908AP64LEDMMA6260Q3.3VAD7730ADCEEPROMRS-232510terLC-A-BAPTD2/KBI21PTD1/KBI12PTD0/KBI03PTB7/T2CH14CGMXFC5PTB6/T2CH06VREG7PTB5/T1CH18VDD9OSC110OSC211VSS12PTB4/T1CH013IRQ114PTB3/RXD15RST16PTB2/TXD17PTB1/SCL18PTB0/SDA19PTC7/SCRXD20PTC6/SCTXD21PTC5/SPSCK22PTC4/SS23PTC3/MOSI24PTC2/MISO25PTA7/ADC726PTA6/ADC627PTA5/ADC528PTA4/ADC429PTA3/ADC330PTA2/ADC231PTA1/ADC132PTA0/ADC033VREFL34VREFH35PTD7/KBI736PTD6/KBI637PTD5/KBI538PTD4/KBI439PTD3/KBI340VSSA41VDDA42IC001MC68HC908AP64SCLK1MCLKIN2MCLKOUT3POL4SYNC5RESET6VBIAS7AGND8AVDD9AIN1(+)10AIN1(-)11AIN2(+)D112AIN2(-)D013REFIN(+)14REFIN(-)15ACX16ACX17STANDBY18CS19RDY20DOUT21DIN22DVDD23DGND24IC002AD7730A01A12A23VSS4SDA5SCL6WP7VCC8IC00324LC01C1+1V+2C1-3C2+4C2-5V-6T2OUT7R2IN8R2OUT9T2IN10T1IN11R1OUT12R1IN13T1OUT14GND15VCC16IC004MAX232Q11Q22Q33Q44Q55Q66Q77GND8Q7'9MR10SH_CP11ST_CP12OE13DS14Q015VCC16IC00574HC595123CN001DC6V--DC25V162738495CN002DB911421531641751861972082192210231124122513CN003DB25XTAL00132.768KHzXTAL0024.9152MHzGND2Vin1Vout3IC006LM2940CT-5.0GND2Vin1Vout3IC007LP2954AITC00100u/35VC006220u/25VC007100u/25VC0040.47uC0051uC0100.1uC0110.1uAVDDVREFDVDDR001330LED001C0130.1uC0150.1uC0200.1uC0260.1uR00210MR0051MC0240.1uC01210u/16VC01410u/16VC02510u/16VC02310u/16VIN+OUT+OUT-IN-C02133PC02233PC02733PC02833PDVDDVREFDVDDPTD0PTD1PTD2PTD3PTD4PTD5PTD6PTD7AVDDBUZZER1+3.3VDVDDSTXoutYoutGND+5VAVDDPTB7C01910u/16VDVDDC0290.1uC0320.1uC0300.1uC0311u/25VC0331u/25VC0341u/25VC0351u/25VC0361u/25VPTB6+5VCSCLKMOSIGNDDVDDDVDDPTB0IRQ1RST12345678910111213141516CN004MON08DVDDDVDDRSTIRQ1PTA0PTA2PTA1PTB0PTB5PTB7OSC1PTC7PTB6DVDDP