Patent ID: 8743522

Claim:
A monitoring circuit for use with a monitored circuit, the monitoring circuit having an input connected to a power supply and an output connected a load, the monitoring circuit comprising: an undervoltage decision circuit coupled to a positive terminal of the power supply, the undervoltage decision circuit including an undervoltage decision output and configured to adjust a logic level of the undervoltage decision output based on a voltage of the positive terminal; an undervoltage level shifter receiving the undervoltage decision output and configured to couple or decouple the power supply and the load based on the logic level of the undervoltage decision output; an overvoltage decision circuit coupled to the positive terminal of the power supply, the overvoltage decision circuit including an overvoltage decision output and configured to adjust a logic level of the overvoltage decision output based on the voltage of the positive terminal; and an overvoltage level shifter receiving the overvoltage decision output and configured to couple or decouple the power supply and the load based on the logic level of the overvoltage decision output.