The MPX200 series device is a silicon piezoresistive pressure sensors provide a very
accurate and linear voltage output — directly proportional to the applied pressure. This
standard, low cost, uncompensated sensor permits manufacturers to design and add
their own external temperature compensating and signal conditioning networks.
Compensation techniques are simplified because of the predictability of Motorola’s single
element strain gauge design.
Features
• Low Cost
• Patented Silicon Shear Stress Strain Gauge
•±0.25% (Max) Linearity
• Full Scale Span 60 mV (Typ)
• Easy to Use Chip Carrier Package Options
• Ratiometric to Supply Voltage
• Absolute, Differential and Gauge Options
Application Examples
• Pump/Motor Controllers
• Robotics
• Level Indicators
• Medical Diagnostics
• Pressure Switching
• Barometers
• Altimeters
Figure 1 illustrates a schematic of the internal circuitry on the stand–alone pressure
sensor chip.
PIN 3
+ V
S
PIN 2
+ V
PIN 4
– V
out
out
X–ducer
0 to 200 kPa (0–29 psi)
60 mV FULL SCALE SPAN
(TYPICAL)
BASIC CHIP
CARRIER ELEMENT
CASE 344–15, STYLE 1
DIFFERENTIAL
PORT OPTION
CASE 344C–01, STYLE 1
NOTE: Pin 1 is the notched pin.
PIN NUMBER
1
Gnd
2
+V
out
3
V
4
–V
S
out
PIN 1
Figure 1. Uncompensated Pressure Sensor Schematic
VOLTAGE OUTPUT versus APPLIED DIFFERENTIAL PRESSURE
The differential voltage output of the X–ducer is directly proportional to the differential
pressure applied.
The absolute sensor has a built–in reference vacuum. The output voltage will decrease
as vacuum, relative to ambient, is drawn on the pressure (P1) side.
The output voltage of the differential or gauge sensor increases with increasing
pressure applied to the pressure (P1) side relative to the vacuum (P2) side. Similarly,
output voltage increases as increasing vacuum is applied to the vacuum (P2) side
relative to the pressure (P1) side.
Senseon and X–ducer are trademarks of Motorola, Inc.
REV 7
Pressure Range
Supply Voltage
Supply CurrentI
Full Scale Span
(4)
Offset
Sensitivity∆V/∆P—0.3—mV/kPa
Linearity
Pressure Hysteresis
Temperature Hysteresis
Temperature Coefficient of Full Scale Span
Temperature Coefficient of Offset
Temperature Coefficient of Resistance
Input ImpedanceZ
Output ImpedanceZ
Response Time
Warm–Up——20—ms
Offset Stability
Weight (Basic Element Case 344–15)——2.0—Grams
Common Mode Line Pressure
NOTES:
1. 1.0 kPa (kiloPascal) equals 0.145 psi.
2. Device is ratiometric within this specified excitation range. Operating the device above the specified excitation range may induce additional
error due to device self–heating.
3. Full Scale Span (V
minimum rated pressure.
4. Offset (V
5. Accuracy (error budget) consists of the following:
• Linearity:Output deviation from a straight line relationship with pressure, using end point method, over the specified
• Temperature Hysteresis: Output deviation at any temperature within the operating temperature range, after the temperature is
• Pressure Hysteresis:Output deviation at any pressure within the specified range, when this pressure is cycled to and from the
• TcSpan:Output deviation at full rated pressure over the temperature range of 0 to 85°C, relative to 25°C.
• TcOffset:Output deviation with minimum rated pressure applied, over the temperature range of 0 to 85°C, relative
• TCR:Zin deviation with minimum rated pressure applied, over the temperature range of –40°C to +125°C,
6. Response Time is defined as the time for the incremental change in the output to go from 10% to 90% of its final value when subjected to
a specified step change in pressure.
7. Common mode pressures beyond specified may result in leakage at the case–to–lead interface.
8. Exposure beyond these limits may cause permanent damage or degradation to the device.
9. Offset stability is the product’s output deviation when subjected to 1000 hours of Pulsed Pressure, Temperature Cycling with Bias Test.
) is defined as the output voltage at the minimum rated pressure.
off
(7)
) is defined as the algebraic difference between the output voltage at full rated pressure and the output voltage at the
FSS
pressure range.
cycled to and from the minimum or maximum operating temperature points, with zero differential pressure
applied.
minimum or maximum rated pressure, at 25°C.
to 25°C.
relative to 25°C.
———690kPa
FSS
FSS
FSS
FSS
FSS
/°C
2Motorola Sensor Device Data
Page 3
LINEARITY
ЙЙЙЙЙЙЙЙЙЙЙ
ЙЙЙЙЙЙЙЙЙЙЙ
ЙЙЙЙЙЙЙЙЙЙЙ
Linearity refers to how well a transducer’s output follows
the equation: V
out
= V
+ sensitivity x P over the operating
off
pressure range (see Figure 2). There are two basic methods
for calculating nonlinearity: (1) end point straight line fit or (2)
a least squares best line fit. While a least squares fit gives
the “best case” linearity error (lower numerical value), the
calculations required are burdensome.
Conversely, an end point fit will give the “worse case” error
(often more desirable in error budget calculations) and the
calculations are more straightforward for the user. Motorola’ s
specified pressure sensor linearities are based on the end
point straight line method measured at the midrange
pressure.
TEMPERATURE COMPENSATION
Figure 3 shows the typical output characteristics of the
MPX200 series over temperature. The output is directly proportional to the pressure and is essentially a straight line.
The X–ducer piezoresistive pressure sensor element is a
semiconductor device which gives an electrical output signal
70
ACTUAL
PRESSURE (kPA)
LINEARITY
THEORETICAL
SPAN
(V
)
FSS
OFFSET
(V
)
OFF
P
OP
60
50
40
30
OUTPUT (mVdc)
20
10
0
0MAX
proportional to the pressure applied to the device. This device uses a unique transverse voltage diffused semiconductor strain gauge which is sensitive to stresses produced in a
thin silicon diaphragm by the applied pressure.
Because this strain gauge is an integral part of the silicon
diaphragm, there are no temperature effects due to differences in the thermal expansion of the strain gauge and the
diaphragm, as are often encountered in bonded strain gauge
pressure sensors. However, the properties of the strain
gauge itself are temperature dependent, requiring that the
device be temperature compensated if it is to be used over
an extensive temperature range.
Temperature compensation and offset calibration can be
achieved rather simply with additional resistive components
or by designing your system using the MPX2200 series
sensors.
Several approaches to external temperature compensation over both – 40 to +125°C and 0 to + 80°C ranges are
presented in Motorola Applications Note AN840.
70
VS = 3.0 Vdc
60
50
40
30
OUTPUT (mVdc)
20
10
0
PSI
kPa
P1 > P2
0
4.08.0121620242830
204060 80 100 120 140 160 180 200
PRESSURE DIFFERENTIAL
–40°C
+25°C
+125
°
C
SPAN
RANGE
(TYP)
OFFSET
(TYP)
Figure 2. Linearity Specification ComparisonFigure 3. Output versus Pressure Differential
SILICONE GEL
DIE COAT
WIRE BOND
LEAD FRAME
DIFFERENTIAL/GAUGE ELEMENT
Figure 4 illustrates the absolute sensing configuration
(right) and the differential or gauge configuration in the basic
chip carrier (Case 344–15). A silicone gel isolates the die
surface and wire bond from the environment, while allowing
the pressure signal to be transmitted to the silicon diaphragm. The MPX200 series pressure sensor operating
DIFFERENTIAL/GAUGE
DIE
P1
P2
STAINLESS STEEL
Figure 4. Cross–Sectional Diagrams (Not to Scale)
METAL COVER
EPOXY
CASE
DIE
BOND
SILICONE GEL
DIE COAT
WIRE BOND
LEAD FRAME
ABSOLUTE
DIE
P1
ABSOLUTE ELEMENT
P2
STAINLESS STEEL
METAL COVER
EPOXY
CASE
DIE
BOND
characteristics and internal reliability and qualification tests
are based on use of dry air as the pressure media. Media
other than dry air may have adverse effects on sensor performance and long term reliability. Contact the factory for information regarding media compatibility in your application.
3Motorola Sensor Device Data
Page 4
PRESSURE (P1)/VACUUM (P2) SIDE IDENTIFICATION TABLE
Motorola designates the two sides of the pressure sensor
as the Pressure (P1) side and the Vacuum (P2) side. The
Pressure (P1) side is the side containing the silicone gel
which isolates the die from the environment. The differential
tial pressure applied, P1 > P2. The absolute sensor is designed for vacuum applied to P1 side.
The Pressure (P1) side may be identified by using the
table below:
or gauge sensor is designed to operate with positive differen-
Part NumberCase TypePressure (P1) Side Identifier
MPX200A, MPX200D344–15CStainless Steel Cap
MPX200DP344C–01Side with Part Marking
MPX200AP, MPX200GP344B–01Side with Port Attached
MPX200GVP344D–01Stainless Steel Cap
MPX200AS, MPX200GS344E–01Side with Port Attached
MPX200GSX344F–01Side with Port Attached
MPX200GVSX344G–01Stainless Steel Cap
ORDERING INFORMATION
MPX200 series pressure sensors are available in absolute, differential and gauge configurations. Devices are available in the
basic element package or with pressure port fittings which provide printed circuit board mounting ease and barbed hose
pressure connections.
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty , representation or guarantee regarding
the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and
specifically disclaims any and all liability, including without limitation consequential or incidental damages. “T ypical” parameters which may be provided in Motorola
data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals”
must be validated for each customer application by customer’s technical experts. Motorola does not convey any license under its patent rights nor the rights of
others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other
applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury
or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola
and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees
arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that
Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal
Opportunity/Affirmative Action Employer.
Mfax is a trademark of Motorola, Inc.
How to reach us:
USA/EUROPE/Locations Not Listed: Motorola Literature Distribution;JAPAN: Nippon Motorola Ltd.; Tatsumi–SPD–JLDC, 6F Seibu–Butsuryu–Center,
P.O. Box 5405, Denver, Colorado 80217. 303–675–2140 or 1–800–441–24473–14–2 Tatsumi Koto–Ku, Tokyo 135, Japan. 81–3–3521–8315
Mfax: RMFAX0@email.sps.mot.com – TOUCHT ONE 602–244–6609ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park,
– US & Canada ONLY 1–800–774–1848 51 Ting Kok Road, T ai Po, N.T., Hong Kong. 852–26629298
INTERNET: http://motorola.com/sps
8Motorola Sensor Device Data
◊
MPX200/D
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