MPX2102AP(2012) Просмотр технического описания (PDF) - Freescale Semiconductor
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производитель
MPX2102AP
(Rev.:2012)
(Rev.:2012)
Freescale Semiconductor
MPX2102AP Datasheet PDF : 17 Pages
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On-Chip Temperature Compensation and Calibration
Pressure
Figure 2 shows the output characteristics of the MPX2102
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.
Silicone Gel
Die Coat
Wire Bond
40 VS = 10 VDC
35
TA = 25°C
MPX2102
30 P1 > P2
25
20
MAX
15
10
5
0
-5
kPa 0
25
PSI
3.62
TYP
MIN
50
7.25
75
10.88
Span
Range
(TYP)
Offset
100
(TYP)
14.5
Figure 2. Output vs. Pressure Differential
Differential/Gauge
Die
P1
Stainless Steel
Metal Cover
Epoxy
Case
Silicone Gel
Die Coat
Wire Bond
Absolute
Die
P1
Stainless Steel
Metal Cover
Epoxy
Case
Lead Frame
Differential/GaugeElement
P2
Bond
Lead Frame
Die
Absolute Element
Die
P2
Bond
Figure 3. Cross Sectional Diagrams (Not to Scale)
Figure 3 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 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.
Freescale’s specified pressure sensor linearities are based
on the end point straight line method measured at the
midrange pressure.
Least Squares Fit
Exaggerated
Performance
Curve
Least
Square
Deviation
Straight Line
Deviation
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 4) 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.
End Point Straight
Line Fit
Offset
0
50
100
Pressure (% Full scale)
Figure 4. Linearity Specification Comparison
Sensors
Freescale Semiconductor, Inc.
MPX2102
5
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