Circuit arrangement having a fail-silent function

摘要

A circuit arrangement for a control device implements a fail-silent and/or fail-safe function, particularly with a hardware-realized detection of a fault or a faulty state in a microcontroller of the circuit arrangement. The circuit arrangement interrupts the communication of the control device with a communications network when a fault is detected.

主权项

1. A circuit arrangement for a control device for implementing a fail-silent and/or fail-safe function, comprising:
a microcontroller comprising a hardware-realized monitoring device that is configured to detect faults in individual modules of the microcontroller and that has at least one output configured to provide a signal voltage to inform external components of detected faults, and a bus driver that is configured to provide a bus communication of the control device with a bus network, wherein: the signal voltage is configured and adapted to control the bus driver so that the bus communication of the control device is interrupted when the monitoring device detects a fault, a GPIO pin of the microcontroller is connected to an STB and/or EN pin of a host interface of the bus driver via an electronic switch, the output of the monitoring device is connected to a control input of the electronic switch, and in the event of the fault, a voltage level of the GPIO pin will be overridden by a suitable voltage level of the signal voltage applied from the output of the monitoring device to the control input of the electronic switch, whereby the STB and/or EN pin will be controlled such that the bus driver will interrupt the bus communication of the control device.