POWER SAFETY CIRCUIT, INTEGRATED CIRCUIT DEVICE AND SAFETY CRITICAL SYSTEM
摘要
A power safety circuit (30) comprises a power sense terminal (32); an output terminal (34); an output driver unit (36) connected to the output terminal; an input terminal (38) connectable to receive a first power from a power source (40) and arranged to supply the first power to the output driver unit; and a power detection unit (42) arranged to detect a state of the input terminal and provide a power sense signal to the power sense terminal; wherein the power sense terminal is arranged to supply a second power to the output driver unit when the power sense signal indicates a level of the first power below a minimum level for driving the output terminal. An integrated circuit device (50) comprises at least one power safety circuit (30). A safety critical system (60) comprises at least one integrated circuit device (50) with at least one power safety circuit (30).