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MPXM2202A Scheda tecnica(PDF) 5 Page - Freescale Semiconductor, Inc |
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MPXM2202A Scheda tecnica(HTML) 5 Page - Freescale Semiconductor, Inc |
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5 / 18 page  MPX2202 Sensors Freescale Semiconductor 5 Pressure On-Chip Temperature Compensation and Calibration Figure 2. Output vs. Pressure Differential 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. 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. 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. Figure 4. Linearity Specification Comparison VS = 10 VDC TA = 25°C P1 > P2 40 35 30 25 20 15 10 5 0 -5 TYP MAX MIN Span Range (TYP) Offset (TYP) 0 50 100 150 200 kPa PSI 7.25 14.5 21.75 29 175 125 75 25 Pressure Lead Frame Wire Bond Differential/Gauge Die Silicone 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 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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