Understanding Smart Sensors - Nomads.usp

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80 Understanding Smart Sensors2mAXDCR1MPX7000SeriessensorD21N4565A6.4V@.5mA3 24 1R5100R330Span4563R6100 k+−1011U1XTR1011 2 147139R41M812R17501/2 WQ1MPSA06D11N40024–20 mAoutputC10.01 mF−+Return24 VPLOOP240.96–4.8 VR21kOffsetFigure 4.7 Pressure sensor with 4- to 20-mA transmitter.Input toSchmitt triggerLightdetectedLightpartiallyblockedLightblockedUpper thresholdLower thresholdOutput toSchmitt triggerOutputlowOutputhighOutputlowFigure 4.8 Schmitt trigger output and photodetector input.digital IC input. The output of the Schmitt trigger can be used directly by digitallogic circuits.
Getting Sensor Information Into the MCU 814.2.8 Inherent Power-Supply RejectionIf a high-voltage power supply with poor regulation is used to provide power tothe sensor and the ADC input to the MCU, a software/hardware scheme canbe used to reduce the errors caused by supply voltage fluctuation [16]. Thescheme relies on the ratiometric properties of the sensor and the ADCs. Asshown in Figure 4.9, a programmable resistor-divider array is used to determinethe amount of attenuation of the unregulated 24V supply. A software algorithmrelies on a calibration procedure that stores data in EEPROM. The resistorvalues are chosen based on the following:• The expected range of unregulated voltages;• The resistor array resolution necessary to attenuate the range ofunregulated voltages;• Power consumption considerations in the digital switch and programmableresistor-divider array.Unregulatedsupply(24V ±20%)1V INV OUT3MC7805CT 128R264RPA 032RV DIV16RR PU8R4R2RRV DDPA 1PA 2PA 3PA 4PA 5PA 6PA 7A/D Ref HighA/D INPA 8MC68HC705B163112−+345R BMC33072Q 1MPSA06V SS2Pressure sensorFigure 4.9 An inherent power-supply rejection circuit for a high-voltage unregulatedsupply.
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Understanding Smart SensorsSecond E
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Library of Congress Cataloging-in-P
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ContentsPrefacexix1 Smart Sensor Ba
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Contentsix3.3.3 Hall Effect 603.3.4
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Contentsxi5.8 Summary 116References
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Contentsxiii8.3.1 Surface Acoustica
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Contentsxv11.1.1 Integration and Me
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Contentsxvii14.4.4 Electrostatic Me
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PrefaceThe number one challenge fac
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Prefacexxifor well over 6 years. A
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2 Understanding Smart Sensorsobserv
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4 Understanding Smart Sensorssmart
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6 Understanding Smart Sensorsto pro
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8 Understanding Smart Sensorsinclud
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10 Understanding Smart SensorsLevel
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12 Understanding Smart Sensorsuser
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14 Understanding Smart Sensorstechn
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16 Understanding Smart Sensorschang
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18 Understanding Smart Sensorstechn
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20 Understanding Smart Sensors Surf
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22 Understanding Smart Sensorssecon
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24 Understanding Smart SensorsSilic
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26 Understanding Smart SensorsSilic
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28 Understanding Smart SensorsSacri
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Page 73 and 74: The Nature of Semiconductor Sensor
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7Control TechniquesA machine is int
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Control Techniques 151Table 7.1Type
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Control Techniques 153otherwise tak
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Control Techniques 155consisting of
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Control Techniques 157Supplied byap
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Control Techniques 159InputX1Synaps
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Control Techniques 1617.6 Adaptive
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Control Techniques 163ObserverHB−
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Control Techniques 165linear-vector
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Control Techniques 1677.7.2 Combine
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Control Techniques 169Domain-type s
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Control Techniques 171[19] De Silva
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8Transceivers, Transponders, andTel
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Transceivers, Transponders, and Tel
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9MEMS Beyond Sensors“And these ot
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MEMS Beyond Sensors 203would not ex
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MEMS Beyond Sensors 205PyrexSilicon
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MEMS Beyond Sensors 207(a)IFluxIIMa
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MEMS Beyond Sensors 209InletThermop
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MEMS Beyond Sensors 211Figure 9.8 A
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MEMS Beyond Sensors 2139.3.2 Microo
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MEMS Beyond Sensors 215Over-range p
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MEMS Beyond Sensors 217+ 10°− 10
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MEMS Beyond Sensors 219achieved wit
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MEMS Beyond Sensors 221Methods for
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MEMS Beyond Sensors 223Figure 9.19
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MEMS Beyond Sensors 225[21] Tortone
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10Packaging, Testing, and Reliabili
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Packaging, Testing, and Reliability
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11Mechatronics and Sensing SystemsP
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Mechatronics and Sensing Systems 25
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12Standards for Smart SensingThe la
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Standards for Smart Sensing 275Netw
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Standards for Smart Sensing 277NCAP
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Standards for Smart Sensing 279Proc
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Standards for Smart Sensing 281PID
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Standards for Smart Sensing 283•
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Standards for Smart Sensing 285•
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Standards for Smart Sensing 287Tabl
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Standards for Smart Sensing 289perf
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Standards for Smart Sensing 2911 0
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Standards for Smart Sensing 293obje
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Standards for Smart Sensing 295Mult
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13The Implications of Smart SensorS
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The Implications of Smart Sensor St
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14The Next Phase of Sensing Systems
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The Next Phase of Sensing Systems 3
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List of Acronyms and Abbreviations3
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List of Acronyms and Abbreviations
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Glossaryablationvaporization of mat
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Glossary 353buscalibrationconnectio
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Glossary 355end point straight line
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Glossary 357data transmission and p
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Glossary 359multiplexer device that
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Glossary 361repeatability the maxim
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Glossary 363spread spectrum techniq
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Glossary 365transducer a device con
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Selected BibliographyBooks and Jour
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Selected Bibliography 369Northeaste
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Selected Bibliography 371Miscellane
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About the AuthorRandy Frank is a te
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Index4-to 20-mA signal transmitter,
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Index 377definitions, 119-20introdu
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Index 379HVAC, 318-19MCU with integ
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Index 381Linearization, 108Linear p
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Index 383in chemical measurements,
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Index 385Ratiometricity, 56Reactive
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Index 387IC fabrication, 19micromec
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Index 389Transducer-independent int
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