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Pressure
Freescale Semiconductor 50 kPa Uncompensated Silicon Pressure Sensors
The MPX53 series silicon piezoresistive pressure sensors provide a very accurate and linear voltage output, directly proportional to the applied pressure. These standard, low cost, uncompensated sensors permit manufacturers to design and add their own external temperature compensating and signal conditioning networks. Compensation techniques are simplified because of the predictability of Freescale's single element strain gauge design.
MPX53 Rev 5, 09/2008
MPX53 Series
0 to 50 kPa (0 to 7.25 psi) 60 mV Full Scale Span (Typical)
Application Examples
* * * * * * * * Air Movement Control Environmental Control Systems Level Indicators Leak Detection Medical Instrumentation Industrial Controls Pneumatic Control Systems Robotics
Features
* * * * * * Low Cost Patented Silicon Shear Stress Strain Gauge Design Ratiometric to Supply Voltage Easy to Use Chip Carrier Package Options 60 mV Span (Typical) Differential and Gauge Options ORDERING INFORMATION
Device Name MPX53D MPX53DP MPX53GP MPXV53GC7U Package Options Tape & Reel Rail Rail Rail Case No. 344 344C 344B 482C None * # of Ports Single Dual * * *
Gauge
Pressure Type Differential * *
Absolute
* *
SMALL OUTLINE PACKAGE
UNIBODY PACKAGES
MPXV53GC7U CASE 482C-03
MPX53D CASE 344-15
MPX53GP CASE 344B-01
MPX53DP CASE 344C-01
(c) Freescale Semiconductor, Inc., 2007-2008. All rights reserved.
Pressure
Operating Characteristics
Table 1. Operating Characteristics (VS = 3.0 Vdc, TA = 25C unless otherwise noted, P1 > P2)
Characteristic Pressure Range(1)
(2)
Symbol POP VS IO VFSS VOFF V/ -- -- -- TCVFSS TCVOFF TCR ZIN ZOUT
Min 0 -- -- 45 0 -- -0.6 -- -- -0.22 -- 0.31 355 750 -- -- --
Typ -- 3.0 6.0 60 20 1.2 -- 0.1 0.5 -- 15 -- -- -- 1.0 20 0.5
Max 50 6.0 -- 90 35 -- 0.4 -- -- -0.16 -- 0.37 505 1875 -- -- --
Units kPa VDC mAdc mV mV mV/kPa %VFSS %VFSS %VFSS %VFSS/C V/C %ZIN/C ms ms %VFSS
Supply Voltage Supply Current Full Scale Offset
(4)
Span(3)
Sensitivity Linearity Pressure Hysteresis (0 to 50 kPa) Temperature Hysteresis Temperature Coefficient of Full Scale Span Temperature Coefficient of Offset Temperature Coefficient of Resistance Input Impedance Output Impedance Response Warm-Up Offset Time(5) Time(6) (10% to 90%)
tR -- --
Stability(7)
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 (VFSS) is defined as the algebraic difference between the output voltage at full rated pressure and the output voltage at the minimum rated pressure. 4. Offset (VOFF) is defined as the output voltage at the minimum rated pressure. 5. 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. 6. Warm-up Time is defined as the time required for the product to meet the specified output voltage after the pressure is stabilized. 7. Offset stability is the product's output deviation when subjected to 1000 hours of Pulsed Pressure, Temperature Cycling with Bias Test.
MPX53 2 Sensors Freescale Semiconductor
Pressure
Maximum Ratings
Table 2. Maximum Ratings(1)
Rating Maximum Pressure (P1 > P2) Burst Pressure (P1 > P2) Storage Temperature Operating Temperature Symbol PMAX PBurst TSTG TA Value 175 200 -40 to +125 -40 to +125 Unit kPa kPa C C
1. Exposure beyond the specified limits may cause permanent damage or degradation to the device.
Figure 1 shows a schematic of the internal circuitry on the stand-alone pressure sensor chip.
3
+VS 2 Sensor 4 +VOUT
-VOUT
1 GND
Figure 1. Uncompensated Pressure Sensor Schematic
Voltage Output versus Applied Differential Pressure
The differential voltage output of the sensor is directly proportional to the differential pressure (P1) relative to the vacuum side (P2). Similarly, output voltage increases as increasing vacuum is applied to the vacuum side (P2) relative to the pressure side (P1).
MPX53 Sensors Freescale Semiconductor 3
Pressure
Temperature Compensation
Figure 2 shows the typical output characteristics of the MPX53 series over temperature. The piezoresistive pressure sensor element is a semiconductor device which gives an electrical output signal 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 MPX2053 series sensors. Several approaches to external temperature compensation over -40 to +125C and 0 to +80C are presented in Freescale Application Note, AN840. LINEARITY Linearity refers to how well a transducer's output follows the equation: Vout = Voff + (sensitivity x P) over the operating pressure range (see Figure 3). 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 "worst case" error (often more desirable in error budget calculations) and the calculations are more straightforward for the user. Freescale's specified pressure sensor linearities are based on the end point straight line method measured at the midrange pressure. Figure 4 illustrates the differential or gauge configuration in the unibody chip carrier (Case 344). A silicone gel isolates the die surface and wire bonds from the environment, while allowing the pressure signal to be transmitted to the silicon diaphragm. The MPX53 series pressure sensor operating 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. Refer to application note AN3728, for more information regarding media compatibility.
+25C -40C Span Range (Typ)
100 90 80 70 Output (mVdc) 60 50 40 MPX53 VS = 3 Vdc P1 > P2
30 20 10 0 PSI 0 kPa 0
+125C
Offset (Typ) 1 10 2 3 4 5 6 20 30 40 Pressure Differential 7 50 8
Figure 2. Output vs. Pressure Differential
90 80 70 60 50 Output (mVdc) 40 30 20 10 0 0 Pressure (kPA) Offset (VOFF) MAX POP Theoretical Lead Frame P2 RTV Die Bond Actual Span (VFSS) Wire Bond Linearity Stainless Steel Metal Cover P1 Epoxy Case
Silicone Die Coat
Die
Figure 3. Linearity Specification Comparison
Figure 4. Unibody Package -- Cross-Sectional Diagram (Not to Scale)
MPX53 4 Sensors Freescale Semiconductor
Pressure
PRESSURE (P1)/VACUUM (P2) SIDE IDENTIFICATION TABLE
Freescale 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 silicone gel which isolates the die from the environment. The Freescale MPX pressure sensor is designed to operate with positive differential pressure applied, P1 > P2. The Pressure (P1) side may be identified by using the following table.
Part Number MPX53D MPX53DP MPX53GP MPXV53 Series Case Type 344 344C 344B 482C Pressure (P1) Side Identifier Stainless Steep Cap Side with Port Marking Side with Port Attached Side with Port Attached
MPX53 Sensors Freescale Semiconductor 5
Pressure
PACKAGE DIMENSIONS
C R M
1
B
-AN
PIN 1
1234
2
3
4
Z
NOTES: 1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M, 1994. 2. CONTROLLING DIMENSION: INCH. 3. DIMENSION -A- IS INCLUSIVE OF THE MOLD STOP RING. MOLD STOP RING NOT TO EXCEED 16.00 (0.630).
DIM A B C D F G J L M N R Y Z INCHES MILLIMETERS MIN MAX MIN MAX 0.595 0.630 15.11 16.00 0.514 0.534 13.06 13.56 0.200 0.220 5.08 5.59 0.016 0.020 0.41 0.51 0.048 0.064 1.22 1.63 0.100 BSC 2.54 BSC 0.014 0.016 0.36 0.40 0.695 0.725 17.65 18.42 30 NOM 30 NOM 0.475 0.495 12.07 12.57 0.430 0.450 10.92 11.43 0.048 0.052 1.22 1.32 0.106 0.118 2.68 3.00
L
-TJ
SEATING PLANE
G F
M
F Y
D 4 PL 0.136 (0.005)
TA
M
DAMBAR TRIM ZONE: THIS IS INCLUDED WITHIN DIM. "F" 8 PL
CASE 344-15 ISSUE AA UNIBODY PACKAGE
SEATING PLANE
-TR H N
PORT #1 POSITIVE PRESSURE (P1)
-AU L
NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH.
DIM A B C D F G H J K L N P Q R S U INCHES MILLIMETERS MIN MAX MIN MAX 1.145 1.175 29.08 29.85 0.685 0.715 17.40 18.16 0.305 0.325 7.75 8.26 0.016 0.020 0.41 0.51 0.048 0.064 1.22 1.63 0.100 BSC 2.54 BSC 0.182 0.194 4.62 4.93 0.014 0.016 0.36 0.41 0.695 0.725 17.65 18.42 0.290 0.300 7.37 7.62 0.420 0.440 10.67 11.18 0.153 0.159 3.89 4.04 0.153 0.159 3.89 4.04 0.230 0.250 5.84 6.35 0.220 0.240 5.59 6.10 0.910 BSC 23.11 BSC
-Q-
B
12 34
PIN 1
K
S
-P0.25 (0.010) J C
M
TQ
S
F G D 4 PL 0.13 (0.005)
M
TS
S
Q
S
CASE 344B-01 ISSUE B UNIBODY PACKAGE
STYLE 1: PIN 1. GROUND 2. + OUTPUT 3. + SUPPLY 4 - OUTPUT
MPX53 6 Sensors Freescale Semiconductor
Pressure
PACKAGE DIMENSIONS
V R
PORT #2 PORT #1
-AU W H N
PORT #2 VACUUM (P2)
L
NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH.
DIM A B C D F G H J K L N P Q R S U V W INCHES MILLIMETERS MIN MAX MIN MAX 1.145 1.175 29.08 29.85 0.685 0.715 17.40 18.16 0.405 0.435 10.29 11.05 0.016 0.020 0.41 0.51 0.048 0.064 1.22 1.63 0.100 BSC 2.54 BSC 0.182 0.194 4.62 4.93 0.014 0.016 0.36 0.41 0.695 0.725 17.65 18.42 0.290 0.300 7.37 7.62 0.420 0.440 10.67 11.18 0.153 0.159 3.89 4.04 0.153 0.159 3.89 4.04 0.063 0.083 1.60 2.11 0.220 0.240 5.59 6.10 0.910 BSC 23.11 BSC 0.248 0.278 6.30 7.06 0.310 0.330 7.87 8.38
PORT #1 POSITIVE PRESSURE (P1)
-QSEATING PLANE
B
SEATING PLANE
PIN 1
1234
-P-TJ C -T0.25 (0.010)
M
K S
TQ
S
F G D 4 PL
0.13 (0.005)
M
TS
S
Q
S
STYLE 1: PIN 1. GROUND
CASE 344C-01 ISSUE B UNIBODY PACKAGE
CASE 482C-03 ISSUE B SMALL OUTLINE PACKAGE
MPX53 Sensors Freescale Semiconductor 7
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MPX53 Rev. 5 09/2008

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