SENSOR DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a sensor device in which a malfunction due to a negative surge or a voltage drop is suppressed.SOLUTION: The sensor device includes: a sensor element whose electrical characteristics change according to a physical quantity; a signal processing circuit for processing an output signal of the sensor element; a transistor element interposed between a power supply terminal and the signal processing circuit; a resistor connecting a drain and a gate of the transistor element or a collector and a base of the transistor element; and an element connecting the gate or the base of the transistor element to GND and having a threshold voltage. The element limits a current flowing from the resistor in the direction of the GND when a supply voltage to the signal processing circuit falls below the threshold voltage.