MPXM2102AS datasheet(388/670 Pages) MOTOROLA

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Motorola Sensor Device Data

www.motorola.com/semiconductors

AN1315

An Evaluation System Interfacing

the MPX2000 Series Pressure Sensors

to a Microprocessor

Prepared by: Bill Lucas

Discrete Applications Engineering

INTRODUCTION

Outputs from compensated and calibrated semiconductor

pressure sensors such as the MPX2000 series devices are

easily amplified and interfaced to a microprocessor. Design

considerations and the description of an evaluation board

using

simple

analog

interface

connected

microprocessor is presented here.

PURPOSE

The evaluation system shown in Figure 1 shows the ease

of operating and interfacing the MOTOROLA MPX2000 series

pressure sensors to a quad operational amplifier, which

amplifies the sensor’s output to an acceptable level for an

analog–to–digital converter. The output of the op amp is

connected to the A/D converter of the microprocessor and that

analog value is then converted to engineering units and

displayed on a liquid crystal display (LCD). This system may

be used to evaluate any of the MPX2000 series pressure

sensors for your specific application.

DESCRIPTION

The DEVB158 evaluation system is constructed on a small

printed circuit board. Designed to be powered from a 12 Vdc

power supply, the system will display the pressure applied to

the MPX2000 series sensor in pounds per square inch (PSI)

on the liquid crystal display. Table 1 shows the pressure

sensors that may be used with the system and the pressure

range associated with that particular sensor as well as the

jumper configuration required to support that sensor. These

jumpers are installed at assembly time to correspond with the

supplied sensor. Should the user chose to evaluate a different

sensor other than that supplied with the board, the jumpers

must be changed to correspond to Table 1 for the new sensor.

The displayed pressure is scaled to the full scale (PSI) range

of the installed pressure sensor. No potentiometers are used

in the system to adjust its span and offset. This function is

performed by software.

Figure 1. DEVB158 2000 Series LCD Pressure Gauge EVB

(Board No Longer Available)

MOTOROLA

SEMICONDUCTOR APPLICATION NOTE

REV 1

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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