MPXM2102AS datasheet(434/670 Pages) MOTOROLA

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AN1326

Barometric Pressure Measurement Using

Semiconductor Pressure Sensors

Prepared by: Chris Winkler and Jeff Baum

Discrete Applications Engineering

ABSTRACT

The most recent advances in silicon micromachining

technology have given rise to a variety of low–cost pressure

sensor applications and solutions. Certain applications had

previously been hindered by the high–cost, large size, and

overall reliability limitations of electromechanical pressure

sensing devices. Furthermore, the integration of on–chip

temperature compensation and calibration has allowed a

significant improvement in the accuracy and temperature

stability of the sensor output signal. This technology allows for

the development of both analog and microcomputer–based

systems that can accurately resolve the small pressure

changes encountered in many applications. One particular

application of interest is the combination of a silicon pressure

sensor and a microcontroller interface in the design of a digital

barometer. The focus of the following documentation is to

present a low–cost, simple approach to designing a digital

barometer system.

Figure 1. Barometer System

DIGIT1

DIGIT2

DIGIT3

DIGIT4

MCU

SIGNAL CONDITIONING

PRESSURE

SENSOR

MOTOROLA

SEMICONDUCTOR APPLICATION NOTE

REV 1

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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