UTI Interface

The Universal Transducer Interface (UTI) is a sensor-to-time signal converter, based on a self-calibrating 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 output is digital and can communicate with any type of micro-controllerThe Universal Transducer
Interface (UTI) is a sensor-to-time signal converter, based on a self-calibrating period-modulated oscillator. The UTI can operate in 16 different modes. To obtain accurate results in any of these modes a reference element of the same kind as the sensor is required.

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 250 Ohm-10 KOhm with maximum imbalance +/- 4% or +/- 0.25%
  • Potentiometers 1 KOhm-50 KOhm

In the exactly same way as the unknown sensor signal is measured, both a reference signal and an 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 digital so compatible with any type micro-controller.

For convenience design-in there are evaluation boards available. In combination with the free downloadable software application will work in shortest time.

The multiplexer MUCC01 is especially designed for use in combination with the Smartec Universal Transducer Interface (UTI). The combination of the UTI and the MUXC01 makes it possible to measure multiple capacitances with a very low capacitance value and a very high accuracy (15 bits).

The multiplexer is special designed to combine with our UTI measuring very accurate capacitors.

By cascading the multiplexers it is easy to extend to the quantity of capacitors needed. Each multiplexer contains a 9 bits shift register and can handle 9 capacitors. Because the capacitance measurement is based on charge transport, special attention is given to the outputs of the circuit. By means of the design the multiplexer has an output impedance of less then 20 Ohms and also the rail-to-rail output voltage is well defined. These requirements make the combination of the UTI and the multiplexer the best solution to multiple capacitance measurement. By constructing array’s each possible capacitance structure can be measured easy and accurate. The device is available in DIL, SOIC or as bare die.

Reference: click here.

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