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MPX2102 Datasheet(PDF) 4 Page - Freescale Semiconductor, Inc

Part No. MPX2102
Description  100 kPa On-Chip Temperature Compensated AND Calibrated Silicon Pressure Sensors
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Maker  FREESCALE [Freescale Semiconductor, Inc]
Homepage  http://www.freescale.com
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MPX2102 Datasheet(HTML) 4 Page - Freescale Semiconductor, Inc

 
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MPX2102
Sensors
4
Freescale Semiconductor
LINEARITY
Linearity refers to how well a transducer's output follows
the equation: VOUT = VOFF + sensitivity x P over the operating
pressure range. There are two basic methods for calculating
nonlinearity: (1) end point straight line fit (see Figure 2) 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 2. Linearity Specification Comparison
ON-CHIP TEMPERATURE COMPENSATION AND CALIBRATION
Figure 3 shows the output characteristics of the MPX2102/
MPXV2102G series at 25°C. The output is directly
proportional to the differential pressure and is essentially a
straight line.
The effects of temperature on Full Scale Span and Offset
are very small and are shown under Operating
Characteristics.
Figure 3. Output vs. Pressure Differential
Figure 4. Cross Sectional Diagrams (Not to Scale)
Figure 4 illustrates the absolute sensing configuration
(right) and the differential or gauge configuration in the basic
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 MPX2102/MPXV2102G 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. Contact the
factory for information regarding media compatibility in your
application.
Least
Square
Deviation
Pressure (% Fullscale)
0
50
100
End Point Straight
Line Fit
Exaggerated
Performance
Curve
Least Squares Fit
Offset
Straight Line
Deviation
VS = 10 VDC
TA = 25°C
MPX2102
P1 > P2
40
35
30
25
20
15
10
5
0
-5
TYP
MAX
MIN
Span
Range
(TYP)
Offset
(TYP)
025
50
75
100
kPa
PSI
3.62
7.25
10.88
14.5
Lead Frame
Wire Bond
Differential/Gauge
Die
Silcone Gel
Die Coat
Differential/Gauge
P2
Die
Bond
Epoxy
Case
Stainless Steel
Metal Cover
P1
Silicone Gel
Die Coat
Absolute
Die
P1
Metal Cover
Epoxy
Case
Absolute Element
P2
Lead Frame
Wire Bond
Die
Bond
Stainless Steel
Element


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