Electronic circuit

An electronic circuit comprising:

• a regulator circuit including a plurality of regulators configured to supply a predetermined voltage by receiving a power supply from a main power source circuit;
• a plurality of functional circuits configured to operate on the voltage supplied from the regulators and perform predetermined functions, and
• a monitor circuit connected to at least one of the regulators and configured to monitor operation mode information inputted to the at least one of the regulators, wherein
• when detecting that the operation mode information contains sleep transition information to make a transition from a normal mode as a normal operation state to a sleep mode as an operation state where power consumption is smaller than that in the normal mode, the monitor circuit outputs a voltage output maintaining signal to the at least one of the regulators connected to the monitor circuit to supply the voltage capable of causing at least one of the functional circuits, which is connected with the at least one of the regulators, to operate in the normal mode,
• at least one of the functional circuits receives a signal, performs a predetermined calculation based on the signal, and outputs a control signal based on a result of the calculation to a target to be controlled by the functional circuits, and
• at least one of the functional circuits is configured as a steering lock processing circuit which receives a vehicle state signal indicative of a state of a vehicle and outputs the control signal based on the vehicle state signal to a steering lock device configured to lock a steering of the vehicle.