CIRCUIT ASSEMBLY AND METHOD FOR MONITORING A MICRO CONTROLLER BASED ON A WATCHDOG VOLTAGE

摘要

The invention relates to a circuit assembly for monitoring the timing behaviour of a micro-controller, comprising a micro-controller (μC) which is arranged to control at least one watchdog voltage generation section (T1, C1, R1, R3, D1; T1, T2, C1, C2, R1, R2, R3, D1) for the temporally defined generation of at least one monitoring voltage (Uc; U1, U2), and to detect and read in the generated monitoring voltage (Uc; U1, U2) at a predetermined sampling time, and comprising the at least one watchdog voltage generation section (T1, C1, R1, R3, D1; T1, T2, C1, C2, R1, R2, R3, D1) which is arranged to generate the monitoring voltage (Uc; U1, U2) that can be detected by the micro-controller at a predetermined sampling time via sampling, wherein a monitoring voltage (Uc; U1, U2) detected at the sampling time and falling within a predetermined voltage tolerance region indicates a fault-free state of the micro- controller (μC), and a monitoring voltage (Uc; U1, U2) detected at the predetermined time and falling outside the predetermined voltage tolerance region indicates a faulty state of the micro-controller (μC). The invention also relates to a method for monitoring a micro-controller on the basis of a watchdog voltage, based on the generation of a monitoring voltage in said watchdog circuit.