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MPXM2010D データシート(PDF) 1 Page - Freescale Semiconductor, Inc |
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MPXM2010D データシート(HTML) 1 Page - Freescale Semiconductor, Inc |
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1 / 24 page  © Freescale Semiconductor, Inc., 2006. All rights reserved. AN1950 Rev 4, 11/2006 Freescale Semiconductor Application Note Water Level Monitoring by: Michelle Clifford, Applications Engineer Sensor Products, Tempe, AZ INTRODUCTION Many washing machines currently in production use a mechanical sensor for water level detection. Mechanical sensors work with discrete trip points enabling water level detection only at those points. The purpose for this reference design is to allow the user to evaluate a pressure sensor for not only water level sensing to replace a mechanical switch, but also for water flow measurement, leak detection, and other solutions for smart appliances. This system continuously monitors water level and water flow using the temperature compensated MPXM2010GS pressure sensor in the low cost MPAK package, a dual op-amp, and the MC68HC908QT4, eight-pin microcontroller. SYSTEM DESIGN Pressure Sensor The pressure sensor family has three levels of integration — Uncompensated, Compensated and Integrated. For this design, the MPXM2010GS compensated pressure sensor was selected because it has both temperature compensation and calibration circuitry on the silicon, allowing a simpler, yet more robust, system circuit design. An integrated pressure sensor, such as the MPXV5004G, is also a good choice for the design eliminating the need for the amplification circuitry. Figure 1. Water Level Reference Design Featuring a Pressure Sensor The height of most washing machine tubs is 40 cm, therefore the water height range that this system will be measuring is between 0–40 cm. This corresponds to a pressure range of 0–4 kPa. Therefore, the MPXM2010GS was selected for this system. The sensor sensitivity is 2.5 mV/kPa, with a full-scale span of 25 mV at the supply voltage of 10 VDC. The full-scale output of the sensor changes linearly with supply voltage, so a supply voltage of 5 V will return a full-scale span of 12.5 mV. (VS actual / VS spec) * VOUT full-scale spec = VOUT full-scale (5.0 V/ 10 V) x 25 mV = 12.5 mV Since this application will only be utilizing 40 percent of the pressure range, 0–4kPa, our maximum output voltage will be 40 percent of the full-scale span. VOUT FS * (Percent FS Range) = VOUT max 12.5 mV * 40% = 5.0 mV The package of the pressure sensor is a ported MPAK package. This allows a tube to be connected to the sensor and the tube is connected to the bottom of the tub. This isolates the sensor from direct contact with the water. The small size and low cost are additional features making this package a perfect fit for this application. Figure 2. A Ported Pressure Sensor |
同様の部品番号 - MPXM2010D |
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同様の説明 - MPXM2010D |
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