Method of and device for bringing a network interface out of a sleep mode into a wake-up state

US5216674A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Cornelius Peter · Ansbach, DE
• Siegfried Dais · Gerlingen, DE

Key dates

• Filing date: Aug 31, 1990
• Grant date: Jun 1, 1993
• Expiry date: Aug 31, 2010

Classification

• Technology area (CPC G): Physics
• CPC primary: G06F11/2007
• WIPO field: Digital communication
• WIPO sector: Electrical engineering

Abstract

An activation device for bringing an network interface of a computer network for a motor vehicle, with at least two bus lines, out of a sleep mode into a wake-up mode. The activation device includes a signal flank change detection circuit, which is coupled to the bus lines and a reference voltage. In the event of an interruption or in the event of a short-circuit of one of the bus lines to ground or to a supply voltage of the computer network, the circuit evaluates a signal arriving on the other, intact bus line and emits a wake-up signal for the activation of the network interface. The flank change detection circuit has two comparators (5, 7), which are connected to the bus lines (U-, U+) and via a voltage divider (19) to a reference voltage (V.sub.cc /2). A voltage offset is produced by the voltage divider (19), by which offset the network interface can be brought into wake-up mode in the event of a short-circuit of the bus lines between each other, even if it was in sleep mode when the fault occurred.