MPXM2102AS datasheet(447/670 Pages) MOTOROLA

447 / 670 page

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Motorola Sensor Device Data

www.motorola.com/semiconductors

AN1516

Liquid Level Control Using a

Motorola Pressure Sensor

Prepared by: JC Hamelain

Toulouse Pressure Sensor Laboratory

Semiconductor Products Sector, Toulouse, France

INTRODUCTION

Motorola Discrete Products provides a complete solution

for designing a low cost system for direct and accurate liquid

level control using an ac powered pump or solenoid valve.

This circuit approach which exclusively uses Motorola

semiconductor parts, incorporates a piezoresistive pressure

sensor with on–chip temperature compensation and a new

solid–state relay with an integrated power triac, to drive

directly the liquid level control equipment from the domestic

110/220 V 50/60 Hz ac main power line.

PRESSURE SENSOR DESCRIPTION

The MPXM2000 Series pressure sensor integrates

on–chip, laser–trimmed resistors for offset calibration and

temperature compensation. The pressure sensitive element

is a patented, single piezoresistive implant which replaces the

four resistor Wheatstone bridge traditionally used by most

pressure sensor manufacturers.

MPAK AXIAL PORT

CASE 1320A

Depending on the application and pressure range, the sensor

may be chosen from the following portfolio. For this application

the MPXM2010GS was selected.

Device

Pressure Range

Application Sensitivity*

MPXM2010GS

0 to 10 kPa

± 0.01 kPa (1 mm H2O)

MPXM2053GS

0 to 50 kPa

± 0.05 kPa (5 mm H2O)

MPXM2102GS

0 to 100 kPa

± 0.1 kPa (10 mm H2O)

MPXM2202GS

0 to 200 kPa

± 0.2 kPa (20 mm H2O)

* after proper gain adjustment

Pin 3

RS1

X–ducer

Roff1

Pin 2

Pin 4

+ Vout

– Vout

Laser Trimmed On–Chip

RS2

Pin 1

Roff2

+ VS

Figure 1. Pressure Sensor MPXM2000 Series

MOTOROLA

SEMICONDUCTOR APPLICATION NOTE

REV 2

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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