Electrical control unit for an automobile
AssigneeHitachi, Ltd.
InventorsKohei Sakurai, Nobuyasu Kanekawa, Mitsuru Watabe, Shoji Sasaki, Katsuya Oyama
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Abstract
An electrical control unit for an automobile of which standby current is smaller. In an electrical control unit for an automobile having a microcomputer, an input circuit, a driver circuit, and a power supply circuit, which is started by a wake-up signal from the circuit other than the ignition switch even when the ignition switch of the automobile is cut off, the microcomputer is started by shifting the power supply circuit from an inert state to an active state to generate the voltage for operating the microcomputer, and the predetermined processing is executed.
Claims7
A power supply circuit comprising:
- a first regulator which generates a voltage to operate an outside microcomputer by inputting a wake-up signal from among a plurality of wake-up signals;
- an OR circuit activating the first regulator by inputting at least one of the wake-up signals;
- a wake-up factor determining register to distinguish whether the first regulator is activated by which one of the wake-up signals;
- and
- a second regulator which generates a voltage to be supplied to the wake-up factor determining register during the time of sleep mode.
Dependencies are inferred from the claim text.