Circuit arrangement and method for monitoring a DSP in the context of a safety-critical application

摘要

A circuit arrangement of a sensor-triggered control system in a safety critical application with a digital signal processor (DSP) is provided. The DSP calculates a first position or attitude from position or attitude signals generated by a sensor. The first position or attitude meets a predetermined requirement to be accurate and unambiguous. A signal conditioning circuit reduces information content of the position or attitude signals to generate reduced position or attitude signals. A position and attitude calculation circuit determiners a second position or attitude based on the reduced position or attitude signals, which does not meet the predetermined requirement. A control unit compares the first position or attitude with the respective second position or attitude to generate a difference and determines whether the difference is within a predetermined scope of accuracy. If the determination of the control unit is negative, a sensor fault signal is outputted.