Microprocessor based universal digital pressure sensor

Details Microprocessor based universal digital pressure sensor Microprocessor based universal digital pressure sensor

1994-03-01

1996-03-19

Paschall, Mark H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219497, 219496, 219505, 73862623, 73862381, H05B 102

Patent

active

055005098

ABSTRACT:
A pressure sensing oscillator (12) and temperature sensing oscillator (14) each produce digital, oscillating signals having frequencies varying with respect to the pressure and temperature, respectively, sensed by each. The signals are input into a temperature compensation circuit (16) which effects a temperature compensation of the pressure signal in accordance with the digital temperature signal. The temperature compensated signal is then input into a microprocessor (18) which filters the signal and generates an output signal based on calibration values stored in an EEPROM. The resulting output signal represents a compensated, calibrated pressure signal. The format for the output signal is a pulse width modulated (PWM) signal having a percent modulation indicative of the temperature compensated, calibrated pressure.

REFERENCES:
patent: 3843877 (1974-10-01), Roselle et al.
patent: 4253335 (1981-03-01), Shimomura
patent: 4295376 (1981-10-01), Bell
patent: 4586108 (1986-04-01), Frick
patent: 4987389 (1991-01-01), Brosh et al.
patent: 5121118 (1992-06-01), Herman
patent: 5255656 (1993-10-01), Rader et al.
Bryzek, Janusz "Evolution of Smart Sensors and Transducers Design," Proceedings of Sensors Expo, West, Mar. 2-4, 1993 Helmers Publishing, Peterborough, N.H.

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