Pressure
Maximum Ratings
Table 2. Maximum Ratings (1)
Maximum Pressure (P1 > P2)
Storage Temperature
Operating Temperature
Rating
Symbol
P max
T stg
T A
Value
200
-40 to +125
-40 to +125
Unit
kPa
° C
° C
1. Exposure beyond the specified limits may cause permanent damage or degradation to the device.
LINEARITY
Linearity refers to how well a transducer's output follows
the equation: V out = V off + 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)
Least Squares Fit
Exaggerated
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
Performance
Curve
Least
Square
Deviation
Straight Line
Deviation
(often more desirable in error budget calculations) and the
calculations are more straightforward for the user. Motorola's
specified pressure sensor linearities are based on the end
point straight line method measured at the midrange
pressure.
Offset
End Point
Straight Line Fit
0
50
100
Pressure (% Fullscale)
Figure 2. Linearity Specification Comparison
MPX2050
Sensors
4
Freescale Semiconductor
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