Smartec sensors:
  Temperature sensor  
  Humidity sensor  
  Infrared sensor  
  UTI Transducer  
  Pressure sensor  
  Excelera Transducer  
  UFDC Frequency to Digital converter  
  USTI Sensor Interface  





Create a Smart sensor with RS-232,  SPI or I2C interface 


USTI Universal Sensor and Transducer Interface

The Universal Sensors and Transducers Interface ( USTI ) is a fully digital CMOS integrated circuit for use with any sensor or transducer with a frequency, period, duty-cycle, interval, PWM , phase shift or pulse number output.  The USTI is perfectly suited to any applications where frequency-time parameters or sensors output signals need to be measured with highest resolution and programmable accuracy. Non-redundant conversion time. The design is based on novel advanced methods for frequency, period, duty-cycle and phase-shift  measurements. 

The USTI covers a wide range of frequencies and accuracies for modern frequency-time domain sensors. In addition, the USTI provides interfacing for resistive (including platinum, cuprum resistors and thermistors), capacitive sensing elements and resistive bridges. The device represents a high-resolution conversion and is designed to support all range of frequency-time domain and digital sensor applications. The USTI  offers high performance with flexibility and requires minimum external components. 



2 identical channels
Wide range of frequencies and accuracy
High precision / high resolution
Frequency (time) to digital conversion
RS232, RS485, SPI or I2C Interface
29 Measuring modes
1 generating mode
Measuring modes hardware selectable
Relative modes hardware selectable
Mode and accuracy set via interface
Slave mode: control via microprocessor.
Master mode: without external control. 
Frequency range from 0.05 Hz to 9 MHz
Frequency of 144 MHz with prescaling
Programmable accuracy (relative error) for frequency (period) conversion from 1 % to 0.0005%.
Non-redundant conversion time
Scalable resolution
Internal reference clock 625 kHz
20 MHz @ 20 MHz quartz oscillator
Quartz-accurate automated calibration
3-wire serial interface (SPI compatible)
2-wire interface (I2C compatible)
RS-232/485 serial interface

 Provides interface for resistive (including platinum (Pt), cuprum (Cu), resistors and thermistors (Ni)), capacitive sensing elements and resistive bridges. Only a single reference element, of the same kind as the sensor, is required.



Typical Applications

Design of Digital Smart Sensors.
Intelligent sensor systems.
Resistance bridge measurement.
Time to Digital Conversion.
Physical and Chemical Sensor
SoC, SiP, BioMEMS, Lab-on-Chip
Industrial and Process Control
Data Acquisition Systems
Frequency counters
Consumer Electronics


28 pin PDIP , 32 pin TQFP, 32 pin MLF.

Download PDF-File

USTI Sensor Datasheet

USTI Specification / Application Datasheet

Part numbers 




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