The most recent advances in silicon micromachiningtechnology have given rise to a variety of low–cost pressuresensor applications and solutions. Certain applications hadpreviously been hindered by the high–cost, large size, andoverall reliability limitations of electromechanical pressuresensing devices. Furthermore, the integration of on–chiptemperature compensation and calibration has allowed asignificant improvement in the accuracy and temperaturestability of the sensor output signal. This technology allows forthe development of both analog and microcomputer–basedsystems that can accurately resolve the small pressurechanges encountered in many applications. One particularapplication of interest is the combination of a silicon pressuresensor and a microcontroller interface in the design of a digitalbarometer. The focus of the following documentation is topresent a low–cost, simple approach to designing a digitalbarometer system.
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