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Smartec sensors:     Temperature sensor     Humidity sensor     Infrared sensor     UTI Interface     Pressure sensor     Evaluation boards     Temp. Eval. boards     Temp. Acq. system     UTI Eval. boards     UNIVERSAL TRANSDUCER INTERFACE SMARTEC SMTUTI Measurement of resistors, capacitors, bridges, Direct connection to micro-processor input.     Features • The Universal Transducer Interface (UTI) is a sensor-to -time signal converter, based on a period-modulated oscillator. • Sensing elements can be directly connected to the UTI without the need for extra electronics to interface all different sensor type. The UTI provides interfacing for: Capacitive sensors 0-2pF, 0-12pF, variable range up to 300pF Platinum resistors Pt100, Pt1000 Thermistors 1 KOhm-25 KOhm at room temperature Resistive bridges 25 Ohm-10 KOhm with maximum imbalance +/- 4% or +/- 0.25% Potentiometers 1 KOhm-50 KOhm Combinations of the above mentioned • The UTI can operate in 16 different modes. • To obtain accurate results in any of the modes, one reference element of the same kind as the sensor is required. Note that this reference is already included in resistive bridges, so no external components are required in this mode. • In the exactly same way as the unknown sensor signal is measured, both a reference signal and a internal (constant) offset are measured during two additional phases. Continuous auto-calibration of offset and gain of the complete system is then achieved by processing these values (time signals) by microcontroller software. The output signal of the UTI is very simple and has discrete amplitude (VDD), so it is compatible with any type micro-controller. • Many application notes and samples available. • UTI Evaluation kit for an easy start.   Typical applications • Typical 4 wire (PT100) measurement. • Multiplexing 3 resistors. • Resistance bridge measurement. • Bridge resistance measurement with temp. compensation . • Multiplexing 3 potentiometers. • Remote measurement systems. • The UTI interfacing in a capacity measurement (also multiplexing). Versions • 16 pin DIP and 18 pin SOIC. Download PDF-File Sensor Datasheet   Smart multiplexer for multiple capacitor measurement Humidity + Temperature measurement with UTI, RS232 output. Flowcharts with software algorithm. Temperature measurement system for legal applications including software for PIC micro. Fact sheet on possibilities of UTI. Application note book on UTI. Accurate measurement of DC Voltages with UTI Startup guide for measurement of capacitors with three signal technique Accurate measuring the phases of the output signal. Long distance sensors on UTI. Especially long cables PT100/1000 measurement. How to connect 8 PT100 element to one UTI (concept). Measuring thermocouple voltage with UTI and analog multiplexer. Pressure sensor interface for the UTI. Part numbers & Price SMTUTI-DIL SMTUTI-SOIC To order or request more information please contact sales@mms-e.com   © 2005 MMS Electronics Ltd Leeds  - All Rights Reserved.