USTIEXT datasheet(2/3 Pages) ETC2

2 / 3 page

• Pulse width, t

p 2

µs – 250 s

• Space interval, t

s 2

µs – 250 s

• Pulse number (events) counting, N

x 0 – 4

×109

• Frequency deviation absolute D

A1, 0 – 7.5 MHz

• Frequency deviation relative D

R1, 0 – 100 %

• Resistance, R

x 12

Ω to 10 MΩ with average relative

error

±0.55 % and ±0.012 % error at splitting of the

range into sub ranges

• Capacitance, C

x 60 pF to 100

µF with average

relative error

±0.05 % and ±0.85 % the worst case

relative error

• Resistive bridges, B

x must not include any internal

components other than 4 arms forming a bridge

• Operating temperature range -55 ºC to +150 ºC

• Storage temperature range -65 °C to +150 °C

NOTE: The USTI EXT can also work with any voltage

and current output sensors. It this case, any voltage–

to-frequency converter (VFC) can be used. The

accuracy of such system will be determined by sensor

accuracy as well as by VFC accuracy.

ACCURACY

The USTI has programmable relative error from 1 to

0.0005 % in all specified range of frequencies for

frequency and period measurements. This error is

constant and does not depend on the measuring

frequencies in all frequency ranges. The USTI has

non-redundant conversion time. The higher conversion

accuracy needs longer conversion time. However, it is

non-redundant

for

any

selected

accuracy

and

frequency. For time interval, phase shift, pulse width

and

space

measurements

the

relative

error

determined

mainly

measurand

and

can

calculated according to the following equation:

100 %,

16 10

δ =

⋅

where tx is the appropriate measuring value of tp, ts or

x depending on the mode.

COMMUNICATION MODES

The USTI can work as an independent measuring unit

(master

mode),

controlled

any

external

microcontroller (or embedded into a sensor), DAQ

board or PC (slave mode). In the master mode, the

conversion accuracy and measurement mode should

be selected by external switches. In this mode the

USTI works only through the RS232 interface in a

unidirectional mode. In the slave mode (with an

external microcontroller), all measuring modes and

programmed accuracy can be set up by a data bus or

through

communication

I/O

ports

master

microcontroller. This allows us use the USTI as a

simple peripheral circuit for a microcontroller. A

bidirectional data exchange is possible with any of

three interfaces RS232, SPI or I2C. The USTI works

as a standard element in different systems with I2C

bus architecture, or can be controlled through the

RS232 or SPI interfaces. The choice of interface can

be performed automatically depend on the circuit

connections.

The selection of communication interface is performed

automatically based on the state of IS1 and IS2 inputs

at the power switch on:

IS1

IS2

Communication Interface

SPI slave

I2C slave

RS232 master

RS232 slave

CHARACTERISTICS

• Single power supply, V: 4.5 – 5.5

• External reference frequency, MHz: 16

• Internal reference frequency, MHz: 16

• Conversion time: 6.25 µs to 0.32 s

• Supply current (at 16 MHz, 4.5 V, 25 ºC), mA: < 12

• Operating temperature range - 55 ºC to +150 ºC

(AEC-Q100 Grade0)

• Storage temperature range -65 °C to +150 °C

PIN-OUT AND HOUSING

The USTI-EXT is available in 32-lead 7 x 7 mm Body

Size, 1.0 mm Body Thickness, 0.8 mm Lead Pitch

small Thin Profile Plastic Quad Flat Package (TQFP);

and 32-pad, 5 x 5 x 1.0 mm Body, Lead Pitch

0.50 mm, 3.10 mm Exposed Pad, Micro Lead Frame

Package (MLF).

PIN FUNCTION DESCRIPTIONS

TQFP/MLF TOP VIEW

FX2

ST1

GND

VCC

GND

VCC

OSC1

OSC2

M0/A0

MES/BS

GND

VCC

SCK/N2

NOTE: Bottom Pad for MLF Package Should be

Soldered to Ground.

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