Volkswagen Ag

Lothar Claus

Olaf Krieger

Christoph Hoffmann

An Ethernet bus having at least two controllers, wherein the controllers each have a bus driver and a microprocessor, wherein at least the first controller has a voltage regulator that adjusts at least two voltage values for the operating voltage of the controller, wherein a first voltage value is provided for a sleep-operating state and the second voltage value is provided for a communication-operating state, wherein the bus drivers are each connected via at least two bus lines, each having a termination network connected to them, wherein the termination network has at least two resistors and a capacitor, wherein the two resistors are provided with one bus line each and are connected to one another at a center tap of the termination network, wherein the capacitor of the termination network is arranged between center tap and earth. Also disclosed is a method for waking a controller.

Ethernet bus, controller and method for waking a controller of an ethernet bus

A bus system having at least two control devices, each of which has a bus driver. The bus drivers are connected together via at least two bus lines, each of which is equipped with at least one coupling capacitor. A terminal network is connected to the bus lines and consists of at least two resistors and a capacitor; each of the two resistors is connected to one of the bus lines and the resistors are connected together at a central tap. The capacitor of the terminal network lies between the central tap and a ground connection, and the bus system has a reference voltage source. The reference voltage source is connected to the central tap via an element. The voltage of the reference voltage source has a value between an operating voltage of the bus system and ground.

Bus system and method for diagnosing a short circuit

A switch unit for an Ethernet network having a switch and a microprocessor, the switch including at least three ports, which are connected to inputs and outputs of the switch unit, a signal detector and generator for detecting and initiating a bus activity being arranged in each case between the ports and the inputs and outputs of the switch unit. For each input and output an allocation rule to the other inputs and outputs of the switch unit is stored in a memory, the switch unit being designed such that when a bus activity is detected at a signal detector and generator, the assigned inputs and outputs of this input and output are read out from the memory and the associated signal detectors and generators are woken up so that they generate a bus activity at their inputs and outputs.

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Königslutter, Germany

Lothar Claus