Patent ID: 7525282
Filing Date: 2009-04-28
Classification: H03M

Abstract:
1. A battery-operated equipment comprising: a battery; a constant voltage power source that derives a constant voltage from a battery voltage across said battery; and a microcomputer that incorporates at least an A/D converter and has terminals for the A/D converter and a power input terminal, said microcomputer being connected with said battery via said power input terminal to use said battery voltage as a power source voltage, said A/D converter being connected with said constant voltage power source via a specific terminal of said terminals for the A/D converter to use said constant voltage as a voltage for the A/D converter, and said A/D converter being connected with said constant voltage power source via a reference voltage input terminal of the A/D converter as said specific terminal to use said constant voltage as a reference voltage for the A/D conversion.