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PDF SCX15AN Data sheet ( Hoja de datos )

Número de pieza SCX15AN
Descripción Precision compensated pressure sensors
Fabricantes Sensor Technics 
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SCX Series
Precision compensated pressure sensors
FEATURES
· 0...1 to 0...150 psi
· Precision temperature
compensation
· Calibrated zero and span
· Small size
· Low noise
· High accuracy
· High impedance for
low power applications
APPLICATIONS
· Medical equipment
· Barometry
· Computer peripherals
· Pneumatic control
· HVAC
EQUIVALENT CIRCUIT
2
Vs
1
35
6
GENERAL DESCRIPTION
The SCX series sensors will provide a very
cost effective solution for pressure
applications that require high accuracy over
a wide temperature range. These internally
calibrated and temperature compensated
sensors were specifically designed to
provide an accurate and stable output over
a 0°C to 70°C temperature range. This series
is intended for use with non-corrosive, non-
ionic working fluids such as air, dry gases,
and the like.
Devices are available to measure absolute,
differential, and gage pressures from 1 psi
(SCX01) up to 150 psi (SCX150). The abso-
lute (A) devices have an internal vacuum
reference and an output voltage propor-
tional to absolute pressure. The differential
(D) devices allow application of pressure
to either side of the pressure sensing
diaphragm and can be used for gage or
differential pressure measurements.
The SCX devices feature an integrated cir-
cuit sensor element and laser trimmed thick
film ceramic housed in a compact nylon
case. This package provides excellent
corrosion resistance and provides isolation
to external package stresses. The package
has convenient mounting holes and pres-
sure ports for ease of use with standard
plastic tubing for pressure connection.
All SCX devices are calibrated for span to
within ±1 % and provide a very low zero
pressure output of ±300 microvolts
maximum. Thus, for many applications no
trimming networks are required in the signal
Scale:
1 cm
½ inch
conditioning circuitry. If the application
requires extended temperature range
operation, beyond 0 to 70°C, two pins which
provide an output voltage proportional to
temperature are available for use with
external circuitry.
The output of the bridge is ratiometric to the
supply voltage and operation from any D.C.
supply voltage up to +20 V is acceptable.
Because these devices have very low
noise and excellent temperature compen-
sation, they are ideal for medical and other
high performance applications. The 100
microsecond response time also makes this
series an excellent choice for computer peri-
pherals and pneumatic control applications.
ELECTRICAL CONNECTION
123456
Bottom view
Pin 1) Temperature output (+)
Pin 2) V
S
Pin 3) Output (+)
Pin 4) Ground
Pin 5) Output (-)
Pin 6) Temperature output (-)
4
August 2005 / 053
Note: The polarity indicated is for pressure applied to port B
(for absolute devices pressure is applied to port A
and the output polarity is reversed.)
1/10
www.sensortechnics.com
Free Datasheet http://www.datasheet4u.com/

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SCX15AN pdf
SCX Series
Precision compensated pressure sensors
APPLICATION INFORMATION (cont.)
Parallel A/D conversion
The SCX sensor can be easily interfaced to a microprocessor bus.
Using an A/D converter, for a 0 to 1 psig input, the circuit in Figure
C will provide an eight-bit parallel output which is proportional to
applied pressure. The circuit allows for easy calibration and uses a
single 5 V supply.
Serial A/D conversion
The circuit shown in Figure D is similar to that shown in Figure C,
except the output is bit serial. Also shown (under the dashed line)
is a complimentary circuit for converting the serial output to a par-
allel output for simplified testing.
Circuit description
The output signal of the sensor is amplified by A1, and A2. The pot,
in resistor R1, can be adjusted to calibrate the gain of the circuit as
shown in the following gain equation:
VOUT = VIN 2 [1+ R/R1]
By adjusting R3, VIN (-) on the A/D converter is used to adjust the
initial offset voltage. A zener diode (LT1004) sets the initial input
voltage and provides the reference voltage for the converter. The
converter will output the maximum digital code when the A/D
converter´s input voltage, VOUT, is twice the zener voltage, minus 1
1/2 LSB. The A/D converter, as shown, is a free-running configuration
where the binary output is updated continously*. The only
requirement is that the WR and INTR must be momentarily grounded
after power-up to ensure proper operation.
Adjustment procedure
1. With no pressure applied, adjust the offset pot R3 until all bits
are zero except the LSB, which should be switching between
one and zero.
2. Apply full-scale pressure (1 psig) to port B, and adjust the full-
scale pot R2 until all bits are ones except the LSB which should
be flickering between one and zero.
3. Repeat procedure if necessary.
* For timing specifications and bus interface, see the ADC0804
Datasheet from National Semiconductor.
Circuit description
The three op amp configuration allows VOUT to be at the same
common-mode voltage as VIN, and takes advantage of the excellent
CMRR of the ADC0831. R2 is used to adjust the gain of the amplifier
such that
VOUT = VIN 2 [3/2+ 2R/R1]
The A/D converter will output the maximum digital code when VOUT
is equal to the zener voltage minus 1 1/2 LSB. the initial offset of the
circuit can be nulled out by adjusting pot R3. The converter circuit
requires only a clock and a chip select (CS) line in order to operate.
As shown in Figure E, when CS goes low, the A/D converter will
start a new conversion on the next rising edge of the clock. On the
next falling edge of the clock, DO will have a zero start bit. Then,
starting with the MSB, the data out line (DO) will provide the converted
digital output during the next eight consecutive falling edges of the
clock. The serial output can be read by using an oscilloscope, a
microprocessor, or a simple serial-to-parallel converter as shown
in Figure D.
Adjustment procedure
1. With zero-pressure, adjust R3, until the output of the
A/D converter is alternating between 00 and 01 (HEX).
2. Apply full-scale pressure (1 psig) to port B, and adjust R4 unti
l the digital output alternates between the FE to FF transition.
3. Repeat procedure if necessary.
Figure A. Low pressure circuits provide a 2 to 5 V output for a 0-10 in. W.C. pressure input
August 2005 / 053
5/10
www.sensortechnics.com
Free Datasheet http://www.datasheet4u.com/

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