To reduce power requirements, the controller may normally be in a sleep mode. The isolation circuit may further include a comparator coupled between the current monitor and the controller. This comparator may sense the current level signal from the current monitor and generate a current alert signal to the controller when the current level signal does not satisfy a current threshold, i.e., the current level signal is equal to and/or crosses a threshold. The current alert signal may cause the controller to transition from sleep mode to an awake mode.

In an embodiment, the controller may be configured to determine which of the first side and the second side of the isolation circuit is closest to the short circuit based on the current alert signal provided from the comparator.

In an embodiment, the isolation circuit may further comprise a voltage monitor, coupled between the system line and the controller, that senses the voltage level on the system line and generates the voltage level signal based on the voltage level.

The voltage monitor may include a first voltage monitor that senses a first voltage level at the first side of the system line and a second voltage monitor that senses a second voltage level at the second side of the system line. The controller may then determine whether one or more thresholds are satisfied based on one or more of the first voltage level or the second voltage level.

The isolation circuit may further include a timer that may be incorporated into the controller, and that in response to the current level signal and/or the voltage level signal, is initialized for a predetermined wait period and enabled to start the wait period.