Vehicle-installed microcomputer system that interrupts power to higher accuracy power supply circuit for sensor A/D converter in sleep mode
US7404097B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 16, 2005 |
| Grant date | Jul 22, 2008 |
| Priority date | — |
| Expiry date | Jan 30, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02D10/00
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The vehicle-installed microcomputer system includes an A/D converter converting analog signal sent from an onboard sensor circuit into digital signal, a microcomputer which operates in one of regular mode where a predetermined arithmetic computation on the digital signal is performed, and sleep mode where the predetermined arithmetic computation is prohibited from being performed, a first power supply circuit supplied with electric power from outside to produce a power supply voltage to be applied to the microcomputer, a second power supply circuit supplied with electric power from outside through an interruption switch to produce a power supply voltage to be applied to the A/D converter and the sensor circuit, the second power supply circuit having an output voltage accuracy higher than that of the first power supply circuit. The power interruption switch is opened to prohibit the second power supply circuit from being supplied with electric power in the sleep mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.