Daimler Chrysler Ag

Mercedes-benz Aktiengesellschaft

Jurgen Minuth

Peter Hanf

Jurgen Setzer

An integrated semiconductor circuit for an electronic control unit has a microcontroller with a bus protocol function for communicating with other microcontrolled control units via a Controller Area Network (CAN) by way of a two-wire bus. The invention includes a bus-fault-tolerant transceive function which permits communication even when a bus fault is present. A bus fault recognition and response device disconnects the bus from its normal connections and alters its termination characteristics when a fault is detected.

Integrated circuit for coupling a microcontrolled control apparatus to a

A device for bus-networked operation of an electronic unit having microcontroller has a semiconductor circuit which is supplied from a superordinate potential, and is connected between a bus protocol module of the microcontroller and the cores of a two core bus. The semiconductor circuit, which has at least two operating modes, 'transmission and reception' (NORMAL) and 'sleep' (SLEEP), compromises: a receiving circuit connected to the two bus cores, whose output communicates with a reception input of the bus protocol; a transmitting circuit coupled to receive the transmission output of the bus protocol function; a wake-up identification circuit connected to the cores of the two core bus, and having a wake-up input and switching means for providing, at a control output, a switch-on signal after identification of a wake-up signal from the wake-up input or from the bus, and for emitting a switch-off signal in the SLEEP mode. A voltage regulator, supplied from superordinate potential, provides a regulated output voltage to the microcontroller and to the bus protocol module. The voltage regulator has a control input which communicates with the control output of the semiconductor circuit, and is configured to switch on in the presence of the switch-on signal and to switch off in the presence of the switch-off signal,

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Eislingen, Germany

Jurgen Minuth