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MPX2053 ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 4 Page - Freescale Semiconductor, Inc

๋ถ€ํ’ˆ๋ช… MPX2053
์ƒ์„ธ๋‚ด์šฉ  50 kPa On-Chip Temperature Compensated & Calibrated Silicon Pressure Sensors
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์ œ์กฐ์‚ฌ  FREESCALE [Freescale Semiconductor, Inc]
ํ™ˆํŽ˜์ด์ง€  http://www.freescale.com
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MPX2053 ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 4 Page - Freescale Semiconductor, Inc

 
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MPX2053
Sensors
4
Freescale Semiconductor
ON-CHIP TEMPERATURE COMPENSATION AND CALIBRATION
Figure 2. Output vs. Pressure Differential
Figure 2 shows the output characteristics of the MPX2053/
MPXV2053G series at 25ยฐC. 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. Unibody Package: 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 MPX2053/MPXV2053G 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.
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 โ€œbest caseโ€ linearity error (lower numerical value), the
calculations required are burdensome.
Conversely, an end point fit will give the โ€œworst caseโ€ error
(often more desirable in error budget calculations) and the
calculations are more straightforward for the user.
Freescaleโ€™s specified pressure sensor linearities are based
on the end point straight line method measured at the
midrange pressure.
Figure 4. Linearity Specification Comparison
VS = 10 Vdc
TA = 25ยฐC
MPX2053
P1 > P2
Span
Range
(Typical)
MAX
TYP
MIN
Offset
(Typical)
kPa
PSI
40
35
30
25
20
15
5
0
10
โ€“5
12.5
25
37.5
50
0
1.8
3.6
5.4
7.25
Silicone
Die Coat
Die
P1
P2
Wire Bond
Lead Frame
RTV Die
Bond
Epoxy
Case
Stainless Steel
Metal Cover
Least
Square
Deviation
Pressure (% Full Scale)
0
50
100
End Point Straight
Line Fit
Exaggerated
Performance
Curve
Least Squares Fit
Straight Line
Deviation
Offset


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