Patent ID: 6466521
Filing Date: 2002-10-15
Classification: G04G

Abstract:
A sensor function-equipped portable device comprising:a sensor for detecting physical information; a sensor drive circuit for driving said sensor; an amplifier circuit for amplifying the sensor signal from said sensor; an A/D converter circuit for converting the output signal of said amplifier circuit into digital information; a sensor data processor circuit for preparing sensor information data from the digital information output from said A/D converter circuit; and a display unit for displaying physical values based on the sensor information data from said sensor data processor circuit, a cell as a low-voltage power source; a step-up power source circuit for elevating the low voltage of said cell to a high voltage; and a constant-voltage power source circuit for stabilizing the high voltage elevated by said step-up power source circuit, said constant-voltage power source circuit being comprised of a constant-voltage generator and a basic reference voltage generator for generating a basic reference voltage, wherein said basic reference voltage generator is electrically supplied with the low voltage of said cell; and wherein said sensor drive circuit is directly driven by the low voltage of said cell, and wherein said amplifier circuit and said A/D converter circuit are driven by the high voltage stabilized by said constant-voltage power source circuit.