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MPX2010 Datasheet(PDF) 4 Page - Freescale Semiconductor, Inc |
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MPX2010 Datasheet(HTML) 4 Page - Freescale Semiconductor, Inc |
4 / 6 page AN1668 Sensors 4 Freescale Semiconductor nulled out by auto-zeroing, these errors must be accounted for when setting the system gain (refer to AN1556 for more details). This forces the total span of the system to be smaller, because we must reserve an extra headroom from the total span to account for amplifier and A/D variations (i.e., amp. sat. voltage, power supply variation, A/D quantization error, and gain errors). If these errors are not accounted for, it could, for example, result in non-linearity errors if the sensor span or offset error causes the amplified output of the sensor to reach the saturation voltage of the amplifier. As an example, a MPX2010 sensor system is designed which has a range of 600 mm H2O FS range with a ±5% FS RMS error. The system uses a +5.0 V ±5% linear regulated power supply, a MC33272 dual op-amp and a 1% resistors. Table 3 shows the resulting specification and component values for the system based on MPX2010 sensor. Note that the error due to system resolution is higher for the MPX2010 solution (± 2 bit A/D accuracy). This is because the MPX2010 span is limited as discussed above. Also, this accuracy assumes that the amplifier does not induce significant errors. As noted MPXV4006G sensor has better overall accuracy. The system resolution is very good because of its large span (4.6 V versus 3.0 V typical). SUMMARY Several washing machine solutions were examined. The MPX10/12 solution can be expensive in terms of additional support circuitry and the added time and labor involved during the calibration procedure. The MPX2010 is good alternative for high volume manufacturing because is already calibrated. With this solution, however, the system amplifier design must be chosen and designed carefully in order to minimize the system error. This is a consideration when deciding to implement a high accuracy solution with the MPX2010 because the cost of the system will go up. The MPXV4006G solution is geared towards high volume manufacturing because trimming, compensation and amplification is already on board. Besides the system simplicity and using less component, the resolution and overall accuracy of this solution is better than the MPX2010 solution. In some cases, less components can actually improve the reliability and manufacturability the system. REFERENCES [1] Benchmark of Washing Machine Mechanical Sensor, Jack Rondoni, Freescale Semiconductor, Inc. Internal Document. [2] Mechanical Sensor Characterization, Ador Reodique, Freescale Internal Document. [3] AN1551 Low Pressure Sensing with the MPX2010 Pressure Sensor, Jeff Baum, Freescale Application Note. [4] AN1636 Implementing Auto-Zero for Integrated Pressure Sensors, Ador Reodique, Freescale Application Note. [5] AN1556 Designing Sensor Performance Specifications for MCU-based Systems, Eric Jacobsen and Jeff Baum, Freescale Application Note. Table 3. MPX2010 Sensor System Values MPX2010 Sensor Design Parameter Description Value Units VCC Reg Power Supply 5 V Differential Gain Gain 433 V/V Vout_FS Full Scale Span 3.02 V VREF Offset Reference 0.66 V Parts List U1A,U1B MC33272 Op-amp R1 Gain Resistor 39.2K Ω R2 Gain Resistor 90.9 Ω R3 Gain Resistor 909 Ω R4 Gain Resistor 392K Ω R + S1 Level Shift Resistor 1K Ω R + S2 Level Shift Resistor 150 Ω X1 MPX2010 Table 4. Performance Comparison between MPX2010 and MPXV4006G Solution Error Contribution MPX2010 Solution Error (FS = 600 mm H2O) MPXV4006G Solution Error (FS = 612 mm H2O) ± % FS ± mm H2O ± % FS ± mm H2O Max Sensor Error 7.19433.0018 System Resolution (A/D + Amplification) 1.30 8 0.80 5 System Error (Sensor + A/D + Amplification) 7.3 44 3.10 19 System Error with Auto-Zero 4.6 28 t3 t19 |
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