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《Transducer and Microsystem Technologies》 2011-06
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Design of capacitive differential pressure sensor based on AD7745

CHEN Bao1,HU Xiao-bing1,SUN Hong2 (1.Sichuan University,Chengdu 610065,China; 2.Mechatronics Research Institute of Yibin,Yibin 644007,China)  
Based on low power consumption MSP430 microcontroller,using new A/D chip AD7745,designed a capacitive differential pressure sensor is used to measure liquid' different pressure,The design principle of capacitive differential pressure sensor,AD7745 and MSP430's software and hardware were presented.The results show the measurement results are stable on the 18 bit,resolution is 0.000 1 pF at range of ±100 pF.The output capacitor has a good linear output characteristics and has good repeatability,and also has low cost.So it was suggested that this system has desirable application value.
【CateGory Index】: TP212.1
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