Abstract: An inexpensive electronic control device is implemented that enables a power supply voltage supplied to a microcomputer to be varied using a simple method and that enables an identical power supply to be adapted to various microcomputers. A switch is turned on to determine the value of a discrete resistor, and a voltage based on the value of current from a current source and the resistance value of the discrete resistor is caused in an In1 terminal. By an A/D converter, the In1 terminal voltage is subjected to A/D conversion, and a digital code corresponding to the selectively connected discrete resistor is detected. The result of the A/D conversion is saved in a register, and the determination of the resistance value of the discrete resistor performed by the A/D converter is completed. After the completion of the resistance value determination performed by the A/D converter, power supply voltages start activation.

Abstract: An electronic control device has a compact abnormality detection circuit that does not require a complicated circuit, and is capable of suppressing a cost increase when being applied a direct injection injector drive circuit and other drive circuits. A current detection circuit includes a current detection resistor, a differential amplifier, and a current detection unit. The current detected is supplied to the abnormality/normality determination unit. A combined resistance value of a diagnostic current drive circuit and the current detection resistor is higher than an injector drive circuit. A fuel injection signal is input to a logic circuit, and a fuel cut signal is input to a different terminal of the logic circuit. The logic circuit's output terminal is connected to the injector drive circuit's gate. The output signal from a fuel injection signal output unit is supplied via a switch to the diagnostic current drive circuit's gate.

Abstract: In a power supply circuit in which a power supply sequence is variable, a malfunction of a device to which power is supplied caused by a wrong power-on order is prevented. In a power supply circuit according to the present invention, an operation state of a previous voltage regulator is detected, and based on a detection result, an order of activation or stop of respective voltage regulators is controlled.

Abstract: A load drive system for driving a load supplied with power from a power line includes a control unit which controls switching between the power line and the load and a communication unit which communicates using voltage and current of the power line. When performing the switching, the control unit controls, based on a width of a transition period of the power-line current, the transition period being attributable to the switching, timing of the switching so as to move the transition period away from a center of a period corresponding to a symbol communicated by the communication unit.

Abstract: Provided is a drive control device for an electric motor in which the number of terminals and the number of wires can be reduced. The drive control device includes: an inverter circuit that drives an electric motor having a plurality of phases; a drive circuit including drivers; a control circuit that outputs a control signal to control the drive circuit; and a signal line that connects the control circuit to the drive circuit to transmits a control signal from the control circuit to the drive circuit, in which the number of signal lines is fewer than the number of the phases of the electric motor.