Circuit device and solenoid control device

A circuit device comprising:

• a current sense amplifier circuit configured to detect a current flowing through a shunt resistor among a switching element, the shunt resistor and an inductor coupled in series between a first power supply node and a second power supply node;
• and
• a processing circuit configured to obtain, based on an output of the current sense amplifier circuit, a corrected current value of the current flowing through the shunt resistor, wherein
• the current sense amplifier circuit includes
• an operational amplifier,
• a first resistor provided between a first resistor node at one end of the shunt resistor and a first node,
• a first switch provided between the first node and a first input node of the operational amplifier,
• a second resistor provided between a second resistor node at another end of the shunt resistor and a second node,
• a second switch provided between the second node and a second input node of the operational amplifier,
• a third resistor provided between a constant voltage node and a third node,
• a third switch provided between the third node and the first input node of the operational amplifier,
• a fourth resistor provided between the constant voltage node and a fourth node, and
• a fourth switch provided between the fourth node and the second input node of the operational amplifier,
• in a current detection period, the first switch and the second switch are turned on, the third switch and the fourth switch are turned off, and the processing circuit acquires a detected current value based on the output of the current sense amplifier circuit,
• in an offset detection period, the first switch and the second switch are turned off, the third switch and the fourth switch are turned on, and the processing circuit acquires an offset value based on the output of the current sense amplifier circuit, and
• the processing circuit obtains the corrected current value based on the detected current value and the offset value.