Abstract: An overvoltage detection circuit coupled to an external power supply via a voltage supply line and comprising a transistor comprising first terminal coupled to the voltage supply line, second terminal coupled to the first terminal via a resistor, the second terminal coupled to a parasitic capacitor, the transistor configured to receive an overvoltage spike from the external power supply on the first terminal, and provide an output voltage on third terminal of the transistor to indicate detection of the overvoltage spike when it has a duration less than a time constant based on the resistor and the parasitic capacitor and amplitude that exceeds a threshold voltage of the transistor. The overvoltage detection circuit further comprises a monitor circuit configured to receive the output voltage from the transistor and provide a digital signal providing a notification of the detected overvoltage spike from the external power supply on the voltage supply line.

Abstract: A calibration process determines a desired supply voltage for operating an electronic device. During the calibration process automatic test equipment controls a power supply to sweep the supply voltage to the electronic device across a predefined voltage range while monitoring a performance characteristic of the electronic device. The automatic test equipment determines the desired operating voltage based on a minimum supply voltage at which the monitored performance characteristic meets a minimum acceptable performance standard and stores the desired operating voltage to a non-volatile storage. During a startup sequence, the electronic device controls the power supply to provide the desired operating voltage as the supply voltage to the electronic device.