| 摘要 |
PROBLEM TO BE SOLVED: To provide a control device in which a plurality of power supply voltages are used for surely detecting the fluctuation of the power supply voltage of a microcomputer with a simple configuration.SOLUTION: A voltage dividing circuit 400 is configured to output a divided voltage Vch of a power supply voltage VDD to an input terminal 310 of a microcomputer 300. The microcomputer 300 has an A/D converter 320. The A/D converter 320 is configured to receive a reference voltage Vref following a power supply voltage VCC, and to convert the divided voltage Vch from the voltage dividing circuit 400 into a digital value Dv. A CPU 330 is configured to detect the fluctuation of the power supply voltage VCC in accordance with the digital value Dv on the basis of the comparison of the divided voltage Vch of the power supply voltage VDD with the reference voltage Vref which changes in accordance with the power supply voltage VCC. |
