High-precision pressure monitoring system using Intelligent sensors and dual-channel signal processor MAX1463
The MAX1463 high-precision pressure monitoring system composed of the circuit diagram as shown. Bridge output voltage of pressure sensors connected MAX1463’s IN1, IN1-end. Under the control of the CPU, the pressure signal followed by non-linear calibration, temperature compensation and analog / digital conversion, the output from the serial interface to the 80C51 microcontroller; has been converted to analog DAC output voltage Uo, sent to the digital voltmeter display the measured pressure value. General Digital I / O interface GPI01 pin connection fault alarm, when the sensor wire open or CPU occurs when overflow in the implementation process, it can drive the buzzer alarm. The sensor signal linearization and temperature compensation are stored in the flash memory through pre-defined algorithm by the user to complete. CPU according to prescribed procedures to implement the instructions stored in the flash memory. When the high CKSEL termination, MAX1463 to select the internal 4MHz clock oscillator. As CPU and ADC operation is fully synchronized, so you can reduce the system noise.