USTIEXT Datasheet, PDF (1/3 Pages) List of Unclassifed Manufacturers – Universal Sensors and Transducer Interface with Extended Temperature Range

Universal Sensors and Transducer Interface
with Extended Temperature Range
USTI EXT
FEATURES
• 29 measuring modes and one generator mode
• 2 channels for frequency and period
measurements
• Frequency (time)-to-digital conversion for many
types of sensors and transducers
• Interfacing for resistive (including platinum (Pt),
cuprum (Cu) resistors and thermistors (Ni)),
capacitive sensing elements and resistive
bridges
• Frequency range from 1 Hz up to 7.5 MHz
without prescaling and 120 MHz with
prescaling;
• Programmable accuracy (relative error) for
frequency (period) conversion from 1 % to
0.0005%
• Relative quantization error is constant in all
specified frequency range
• Non-redundant conversion time
• Scalable resolution
• Internal reference clock 16 MHz
@ 16 MHz quartz oscillator
• Quartz-accurate automated calibration
• 3-wire serial interface (SPI compatible)
• 2-wire interface (I²C compatible)
• RS232/485 serial interface
• Master and slave communication modes
• Frequency generator mode 8 MHz with quartz
crystal stability
• Operating temperature range -55 ºC to +150 ºC
APPLICATIONS
Physical and Chemical Sensor Systems
Digital Sensors, SoC, SiP
Smart and Intelligent Sensors and Systems
Industrial and Process Control
Data Acquisition Systems
Instrumentations
Customer Electronics
Automotive
GENERAL DESCRIPTION
The Universal Sensors and Transducers Interface
(USTI-EXT) is a fully digital CMOS integrated circuit
based on novel patented methods for frequency,
period, its ratio, duty-cycle and phase-shift
measurements. This IC has similar metrological
performance as Excelera’s UFDC-1M-16 and same
functionalities as the USTI IC but can work in extended
operation temperature range from - 55 ºC to +150 ºC.
FUNCTIONAL BLOCK DIAGRAM
sensor applications. It offers high performance with
flexibility and requires minimum possible number of
external components.
The USTI-EXT can be easy included into digital
environment, controlled by an external microcontroller
(slave mode) or work independently as a separate
measuring unit without an external control (master
mode). The function selection can be configured in
both software and hardware.
The IC converts frequency-time parameters of signals
into digital, and provides interface to microcontroller,
DAQ or sensor system to read these digital results.
The USTI-EXT has 29 measuring and one generating
modes. The measuring mode can be hardware-
selected by using four selection external pins M0-M2
and the relative error by using four selection pins N0-
N2 (RS232 master communication mode). The mode
and accuracy can be also selected by using any of
three possible interfaces (slave communication mode).
A communication interface type (RS232, SPI or I²C)
can be automatically selected according to the circuit
connection.
MEASURING MODES
• Frequency, f_x1 1 Hz – 7.5 MHz directly and up to
120 MHz with prescaling
• Period, T_x1 150 ns – 20 s
• Phase shift, ϕx 0 - 360⁰ at f_xmax = 500 kHz at 50 %
duty-cycle
• Time interval between start – and stop-pulse, τ_x
• 2 µs – 250 s
• Duty-cycle, D.C. 0 – 1 at f_xmax ≤ 500 kHz
• Duty-off factor, Q 10-8 – 8.106 at f_xmax ≤ 500 kHz
• Frequency difference, f_x1 – f_x2 with sign recognition,
0 – 7.5 MHz
• Period difference, T_x1 – T_x2 with sign recognition,
0 – 20 s
• Frequency ratio, f_x1/f_x2 7 ×10^-9 – 1.4 × 10⁸
• Period ratio, T_x1/T_x2 7.5 × 10^-9 – 1.33 ×10⁸
• Rotation speed, n_x = (f_x ×60)/Z, where Z is the
number of encoder teeth