Semiconductor device and physical quantity sensor device

A physical quantity sensor device, comprising:

• a thermistor for temperature detection;
• a physical quantity sensor that detects a physical quantity and outputs a physical quantity detection signal;
• a series resistor selection circuit including a series resistor group that is connected in series with the thermistor, the series resistor selection circuit being configured to select a series resistor from the series resistor group according to a selection signal;
• a multiplexer that outputs one of
• a divided voltage obtained by dividing an internal power supply voltage between the thermistor and the selected series resistor, and
• the physical quantity detection signal,
• by switching between the divided voltage and the physical quantity detection signal according to a switching signal;
• an analog/digital (A/D) converter that performs A/D conversion on the divided voltage or the physical quantity detection signal output from the multiplexer;
• and
• a control circuit that
• causes the multiplexer to output the physical quantity detection signal according to the switching signal, and controls the A/D converter to perform the A/D conversion on the physical quantity detection signal in a high bit count mode, to thereby obtain first physical quantity detection data,
• during period of selecting the series resistor, causes the multiplexer to output the divided voltage according to the switching signal, and controls the A/D converter to perform the A/D conversion on the divided voltage in a low bit count mode to thereby obtain first temperature data, such that the divided voltage falls within a predetermined voltage range,
• after selecting the series resistor, controls the A/D converter to perform the A/D conversion on the divided voltage in the high bit count mode, to thereby obtain second temperature data, and
• processes the first physical quantity detection data using the second temperature data and a correction coefficient to generate second physical quantity detection data.