Ultra-low-power components for an RFID Tag with physical and chemical sensors |
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Authors: | Stefano Zampolli Ivan Elmi Enrico Cozzani Gian Carlo Cardinali Andrea Scorzoni Michele Cicioni Santiago Marco Francisco Palacio Jose M Gómez-Cama Ilker Sayhan Thomas Becker |
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Affiliation: | (1) CNR––IMM Bologna, Via P. Gobetti 101, 40129 Bologna, Italy;(2) Dipartimento di Ingegneria Elettronica e dell’Informazione, Università di Perugia, via Duranti 93, 06125 Perugia, Italy;(3) Departament d’Electronica, Universitat de Barcelona, Martí i Franqués 1, 08028 Barcelona, Spain;(4) Dept. IW-SI, EADS Innovation Works, 81663 München, Germany |
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Abstract: | In this work the development and optimization of the main components for a multisensing flexible Tag with RFID communication
capabilities and integrated physical and chemical sensors for logistic datalogging applications will be reported. For this
specific scenario, several constraints must be considered: power consumption must be limited for long-term operation, reliable
ISO compliant RFID communication must be implemented, and special encapsulation issues must be faced for reliable sensor integration.
In this work, the developments on application specific electronic interfaces and on ultra-low-power Metal OXdide semiconductor
(MOX) gas sensors will be reported. The electronics for sensor control and readout as well as for RFID communication are based
on an ultra-low-power MSP430 microcontroller from Texas Instruments together with a custom RFID front-end based on analog
circuitry and a CPLD digital device, and are designed to guarantee a passive ISO15693 compliant RFID communication in a range
up to 6 cm. A thin film battery for sensor operation is included, thus data acquisition and storage can be accomplished when
no reader field is present. This design allows the user to access both the traceability and sensor information even when the
on-board battery is exhausted. The physical sensors for light, temperature and humidity are commercially available devices,
while for chemical gas sensing innovative MOX sensors are developed, based on ultra-low-power micromachined hotplate arrays
specifically designed for flexible Tag integration purposes. A single MOX sensor requires only 8.9 mW for continuous operation,
while temperature modulation and discontinuous sensor operation modes are implemented to further reduce the overall power
consumption. The development of the custom control and RFID front-end electronics, together with innovative ultra-low-power
MOX sensor arrays with flexible circuit encapsulation techniques will be described. |
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Keywords: | RFID Ultra-low-power MOX sensors Logistics |
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