Introducing a System-on-Chip(SoC)microcontroller(C8051F350)into a ceramic pressure sensor has resulted in the design of a networking intelligent sensor.An improved algorithm for digital phase-sensitive detection is used to perform lock-in amplification of the sensor signal.The compensation for the sensor error is realized by the detection of the sensor’s supply voltage and working temperature.The system also has the function of short/open circuit fault detection and can communicate with other digital equipment through an RS-485 communication interface.In the design,full utilization of the SoC microcontroller’s internal resource results in the simple hardware structure.Experimental results show that the error of the sensor is less than 0.5% at range ratio 1∶10.Employing the microcontroller and using lock-in amplification algorithm are an effective method for achieving an intelligent sensor of slowly-varying physical quantities,thereby improving the measuring accuracy and performance.
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