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dc.contributor.authorCustodio Ruiz, Ángel
dc.contributor.authorBragós Bardia, Ramon
dc.contributor.authorPallàs Areny, Ramon
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica
dc.identifier.citationCustodio, A.; Bragós Bardia, R.; Pallás Areny, R. A novel sensor-bridge-to-microcontroller interface. A: Instrumentation and Measurement Technology Conference. Proceedings of the 18th IEEE Instrumentation and Measurement Technology Conference, 2001. IMTC 2001. Piscataway, 2001, Vol. 2, 892-895
dc.description.abstractSensor bridges are usually interfaced to microcontrollers by supplying the bridge with a voltage or current and digitizing the resulting voltage or current after being amplified and low-pass filtered. This paper proposes an alternative method to interface a sensor bridge to a microcontroller that does not need any active component between the bridge and the microcontroller The bridge is considered a network with three inputs and one output. The resistance of each input to the output depends on the measurand. Using each input in turn to charge a capacitor connected to the bridge output yields three different time intervals. For a full bridge (a sensor at each arm), the ratio between the difference between two time intervals and the third time interval yields the fractional resistance change. Two-point calibration reduces zero and gain errors attributable to the electrical parameters of the ports of the microcontroller. The absolute error for a 15 psi (103.4 kPa) pressure sensor with 5000 Ω arms and a full-scale output of 125 mV is below 0.05% of full scale, which is better than 1 LSB for an 11 bit ADC
dc.publisherInstitute of Electrical and Electronics Engineers
dc.relation.ispartof18th IEEE Instrumentation and Measurement Technology Conference
dc.subjectÀrees temàtiques de la UPC::Enginyeria electrònica::Instrumentació i mesura::Sensors i actuadors
dc.subjectÀrees temàtiques de la UPC::Enginyeria electrònica::Microelectrònica
dc.subject.lcshElectronic controllers
dc.subject.otherSensor bridge
dc.subject.otherMicrocontroller interfaces
dc.titleA novel sensor-bridge-to-microcontroller interface
dc.typeConference report
dc.contributor.groupUniversitat Politècnica de Catalunya. GRUP ISI - Grup d'Instrumentació, Sensors i Interfícies
dc.description.peerreviewedPeer Reviewed
dc.rights.accessOpen Access

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