Vol. 10, Special Issue, February 2010, pp.46-59

A Simple and Universal Resistive-Bridge Sensors Interface   Sergey Y. Yurish Technology Assistance BCNA 2010, S. L. Research & Development Department, C/Riera de Tena local, nº9 local 4, 08014, Barcelona, Spain Tel.: +34 696067716, E-mail: SYurish@sensorsportal.com Http://www.techassist2010.com/   Received: 22 October 2010   /Accepted: 11 January 2011   /Published: 8 February 2011

Abstract: Resistive-bridge sensors are widely used in various sensor systems. There are many sensor signal conditioners from different manufacturers for such sensing elements. However, no one existing on the modern market integrated converter for resistive bridge sensors can work with both: resistive-bridge sensing elements and resistive-to-frequency and -duty-cycle converters’ outputs. A proposed and described in the article universal interface for resistive-bridge sensing elements and bridge-output-to-frequency and/or duty cycle converters based on the designed Universal Sensors and Transducers Interface (USTI) integrated. It is based on a simple, cost effective three-point measuring technique and does not require any additional active components. The USTI IC is realized in a standard CMOS technology. The active supply current at operating voltage +4.5 V and clock frequency 20 MHz is not more than 9.5 mA This paper reports experimental results with a strain gauges bridge emulator and differential pressure resistive bridge sensor SX30GD2.

Keywords: Resistive sensor bridges, Universal sensors and transducers interface, Resistive-bridge sensors, Bridge-to-frequency converter, USTI, Sensor signal conditioners

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