The disclosure provides a voltage detecting circuit that detects voltage increases and voltage decreases using a diode drop and voltage thresholds. The voltage detecting circuit, referred to as a voltage variation detector, uses the diode to maintain a differential between the voltage being monitored and a voltage threshold. When the diode is reversed bias, the voltage variation detector generates a detecting signal indicating the monitored voltage crossed the voltage threshold. In one example, the method includes: (1) detecting at least one transition of a voltage across a voltage threshold, wherein the detecting is based on a transistor diode being reversed biased, (2) generating a detection signal when the voltage crosses the voltage threshold, and (3) performing one or more actions in response to the detection signal.

The disclosure provides a voltage detecting circuit that detects voltage increases and voltage decreases using a diode drop and voltage thresholds. The voltage detecting circuit, referred to as a voltage variation detector, uses the diode to maintain a differential between the voltage being monitored and a voltage threshold. When the diode is reversed bias, the voltage variation detector generates a detecting signal indicating the monitored voltage crossed the voltage threshold. In one example, the method includes: (1) detecting at least one transition of a voltage across a voltage threshold, wherein the detecting is based on a transistor diode being reversed biased, (2) generating a detection signal when the voltage crosses the voltage threshold, and (3) performing one or more actions in response to the detection signal.