Pressure Transmitter Data Acquisition System circuit 1B31,18 bit A / D converter AD1170 and MCS-51 microcontroller


Posted on Mar 28, 2007

Pressure transmitter circuit data acquisition system by 1B31,18 bit A / D converter AD1170 and MCS-51 microcontroller


Pressure Transmitter Data Acquisition System circuit 1B31,18 bit A / D converter AD1170 and MCS-51 microcontroller
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configuration shown in Fig. Will be a full-scale output voltage of 10mV pressure transmitter connected to the 1B31, 1B31 set a gain of 500 times, the output voltage range is 0 ~ 5V. Excitation voltage is set to + 5V, in order to perform computing the ratio, the AD1170 voltage also serves as a reference voltage by the voltage of the initialization command ECAL as AD1170 full-scale input voltage, then by periodically calibrating the A / D converter You can follow the reference voltage changes, with the ratio of output characteristics. As a result of the low-pass filter and A / D conversion technology, so the system has a high common-mode rejection ratio. Use microcontroller AD1170 is initialized, but also to eliminate fixed offset voltage generated by the bridge asymmetric, so do not have to use zero potentiometer (or software) zeroing up.




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