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© Freescale Semiconductor, Inc., 2006. All rights reserved.
AN1326
Rev 3, 11/2006
Freescale Semiconductor
Application Note
Barometric Pressure Measurement Using
Semiconductor Pressure Sensors
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
