Abstract: Provided is a semiconductor device including: an AC voltage generation unit that generates an AC voltage having an amplitude according to a control signal; a resistance element provided in series with a measurement target, the AC voltage being applied to the resistance element; a voltage detecting unit that detects that a difference voltage between two ends of the resistance element has reached a specified voltage; and a control unit that outputs the control signal to the AC voltage generation unit to cause the AC voltage generation unit to generate the AC voltage so that the difference voltage reaches the specified voltage, based on a detection result of the voltage detecting unit.

Abstract: A semiconductor device includes a variable current generating unit that sends a direct current of a value according to a control signal from one measurement node of a bridge circuit in which a change amount of a resistance value of a pressure-sensitive resistance element appears as a potential difference between measurement nodes, a potential difference determining unit that determines whether or not the potential difference has been generated, and a control unit that outputs the control signal to the variable current generating unit so that the variable current generating unit sends the direct current of a value that does not generate the potential difference based on a determination result of the potential difference determining unit.

Abstract: According to one embodiment, a semiconductor device 1 includes: a variable current generating unit 11 that sends a direct current Idac of a value according to a control signal S1 from one measurement node of a bridge circuit B1 in which a change amount ?R4 of a resistance value of a pressure-sensitive resistance element R4 appears as a potential difference ?V between measurement nodes NA, NB; a potential difference determining unit 12 that determines whether or not the potential difference ?V has been generated; and a control unit 13 that outputs the control signal S1 to the variable current generating unit 11 so that the variable current generating unit 11 sends the direct current Idac of a value that does not generate the potential difference ?V based on a determination result D1 of the potential difference determining unit 12.

Abstract: Provided is a semiconductor device including: an AC voltage generation unit that generates an AC voltage having an amplitude according to a control signal; a resistance element provided in series with a measurement target, the AC voltage being applied to the resistance element; a voltage detecting unit that detects that a difference voltage between two ends of the resistance element has reached a specified voltage; and a control unit that outputs the control signal to the AC voltage generation unit to cause the AC voltage generation unit to generate the AC voltage so that the difference voltage reaches the specified voltage, based on a detection result of the voltage detecting unit.