Integrated circuit for controlling the loads of automobile circuitry
US4882502A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 17, 1988 |
| Grant date | Nov 21, 1989 |
| Priority date | — |
| Expiry date | Jun 17, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/0016
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An integrated circuit in which the effective power consumed by the pull-up resistor of a switch for controlling the loads of electrical circuitry of an automobile is reduced by passing the current through the pull-up resistor in synchronization with the duration of the pulse width of an input latching pulse only when the latching pulse is supplied. The integrated circuit thus may be powered by a regulated power supply due to its lower power consumption. Also, a surge arrester circuit is no longer required, thereby making it possible to reduce the size of the integrated circuit. The integrated circuit configured in this manner outputs a signal indicative of the on/off status of the switch without draining the battery due to the excess current which passes through the pull-up resistors in corresponding integrated circuits of the prior art.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.