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기능 Precision compensated pressure sensors
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SCX30AN 데이터시트, 핀배열, 회로
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/




SCX30AN pdf, 반도체, 판매, 대치품
SCX Series
Precision compensated pressure sensors
Physical construction (cutaway diagram) (not drawn to scale)
APPLICATION INFORMATION
The following circuits show some typical designs using the SCX
series sensors. For specific applications information or assistance,
please contact your nearest Sensym sales office or the Sensym
factory.
Low pressure applications
For sensing pressures below 1 psi, the circuit shown in Figure A
uses the SCX01DN to provide a 2 to 5 V output for a 0 to 10 inch of
water column input pressure. This output signal is compatible with
many A/D converters and hence can be used to interface to a
microprocessor system. This low-cost circuit is easily adaptable to
lower full-scale pressures down to 5 inches of water column.
Circuit description
The LM10 is used to provide a voltage reference for the excitation
voltage (VE), and for the voltage node VREF. With this configuration,
VE and VREF are not affected by noise or voltage variations in the 12
V power supply. R3 is used to adjust VREF to set the initial offset
voltage at the output, VOUT.
The pressure signal, VIN, is amplified by amplifiers B1, and B2 (see
Sensym Application Note SSAN-17A for details on this amplifier)
R2 is used to adjust the signal gain of the circuit. The output equation
is given below.
VOUT = VIN [ 2 (1+ R/R1)]+VREF
For the best circuit performance, a careful selection of components
in necessary. Use wirebound pots of insure low temperature
coefficients and low longterm drift. A five-element resistor array
(10k) SIP should be used for the resistors in the amplifier stage in
order to obtain closely matched values and temperature coefficients.
All other resistors should be 1% metal film. Amplifiers B1, and B2
should have low offset voltage and low noise. Signal lines should
be as short as possible and the power supply should be capacitively
bypassed on the PC board.
Adjustment procedure
1. With zero-pressure applied, adjust the offset adjust R3,
until VOUT = 2.000 V
2. Apply full-scale pressure (10 in. W.C) to port B1 and adjust the
full-scale adjust R2, so that VOUT = 5.000 V.
3. Repeat procedure if necessary.
Medical applications
For blood pressure monitoring applications, the circuit shown in
Figure B provides a 0.5 V to 3.5 V output for a 0 to 300 mm Hg input
pressure. The circuit is easily calibrated and is not affected by
changes in the voltage supply. Because 300 mm Hg is approximately
5.8 psi, an SCX05DN is used.
Circuit description
The circuit shown here in Figure B is very similar to that shown in
Figure A. The internal 200 mV reference voltage of the LM10 is
amplified to provide power to the sensor and to provide a voltage
reference, VREF. This allows the circuit to operate at a supply voltage
between 5 and 20 volts without affecting performance of the circuit.
By adjusting R3, VREF is used to set the initial zero-pressure voltage
at VOUT. The pressure signal, VIN, is amplified by amplifiers B1 and
B2. These amplifiers should be precision op amps with low offset
voltages and high common-mode rejection. The signal gain is
adjusted by R2, and the overall equation for the output voltage is
given by ,
VOUT = VIN [ 2 (1+ R/R1)]+VREF
Adjustment procedure
1. With zero-pressure applied, adjust the offset adjust
R3, until VOUT = 0.500 V
2. Apply full-scale pressure (300 mm Hg) to port B1 and adjust
R2, until VOUT = 3.500 V.
3. Repeat procedure if necessary.
4/10 August 2005 / 053
www.sensortechnics.com
Free Datasheet http://www.datasheet4u.com/

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SCX30AN 전자부품, 판매, 대치품
SCX Series
Precision compensated pressure sensors
Figure D. Serial A/D conversion for 0-1 psig applications and simple test circuit
August 2005 / 053
7/10
www.sensortechnics.com
Free Datasheet http://www.datasheet4u.com/

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Precision compensated pressure sensors

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