MPXM2202AS Просмотр технического описания (PDF) - Freescale Semiconductor
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MPXM2202AS Datasheet PDF : 18 Pages
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On-Chip Temperature Compensation and Calibration
Pressure
40 VS = 10 VDC
35 TA = 25°C
30 P1 > P2
TYP
25
20
MAX
15
Span
Range
(TYP)
10
MIN
5
0
-5
kPa 0
PSI
25 50 75 100 125 150 175 200
7.25
14.5
21.75
29
Pressure
Figure 2. Output vs. Pressure Differential
Offset
(TYP)
Figure 2 shows the output characteristics of the MPX2202
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
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/Gauge Element
P2
Bond
Lead Frame
Die
Absolute Element
Die
P2
Bond
Figure 3. Cross Sectional Diagram (not to scale)
Figure 3 illustrates the differential/gauge die 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 MPX2202 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 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.
Freescale’s specified pressure sensor linearities are based
on the end point straight line method measured at the
midrange pressure.
End Point Straight
Line Fit
Offset
0
50
100
Pressure (% Full Scale)
Figure 4. Linearity Specification Comparison
Sensors
Freescale Semiconductor
MPX2202
5
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