High precision pressure test system circuit composed of the MAX1463

Published:2011/7/8 5:08:00 Author:Christina | Keyword: High precision, pressure, test system | From:SeekIC

The high precision pressure test system circuit which is composed of the MAX1463 is as shown in the figure. The output voltage of the bridge type pressure sensor is connected with the IN1+ and IN1- ports of MAX1463. Under the control of CPU, the pressure signal is nonlinearly calibrated and temperature compensated and D/A converted by the circuit, then it is output by the serial interface to the 80C51 single-chip microcomputer; it also changes into the analog output voltage Uo and adds to the digital voltmeter to display the tested pressure value. The GPI01 pin of the general digital I/O interface is connected with the fault alarm, when the lead of the sensor is open-circuit or the CPU overflows, the buzzer will send out the sound of alarm.



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