Patent ID: 9537581
Date: 2017-01-03
CPC Classifications: H04B

Claim:
1. An apparatus comprising: a first terminal; a second terminal; a bi-directional regulator circuit configured to generate a voltage across a first power supply node and a second power supply node in response to an input current flowing through the first terminal into the bi-directional regulator circuit and from the bi-directional regulator circuit through the second terminal with a first polarity and configured to generate the voltage across the first power supply node and the second power supply node in response to the input current flowing through the second terminal into the bi-directional regulator circuit and from the bi-directional regulator circuit through the first terminal with a second polarity opposite the first polarity; and functional circuitry, powered by the voltage and configured to generate a signal using the voltage, the signal being indicative of presence of the input current.