Electronic fuse systems and devices

A device, comprising:

• current sensing circuitry configured to sense a current in a conductor coupled between a power supply and a load, and generate a current sensing signal indicative of the sensed current;
• current squared times time (I2t) circuitry that emulates an I2t curve of the conductor, the I2t circuitry configured to receive the current sensing signal and determine whether the sensed current exceeds the I2t curve of the conductor;
• and
• self-testing circuitry configured to test a current sensing function of the current sensing circuitry, and generate a test signal indicating a result of the test.

A system, comprising:

• a power supply;
• a load;
• a conductor electrically coupled to the power supply and the load;
• current sensing circuitry configured to sense a current in the conductor, and generate a current sensing signal indicative of the sensed current;
• and
• current squared times time (I2t) circuitry, including:
• logic circuitry configured to compare the sensed current to a plurality of first thresholds, each of the plurality of first thresholds being different from one another;
• counter circuitry configured to adjust a counting value speed and direction based on the comparison of the sensed current to each of the plurality of first thresholds, and generate an overflow signal in response to the counting value reaching or exceeding a threshold counting value;
• and
• latch-off circuitry including a comparator configured to compare the sensed current to a second threshold, and generate an interrupt signal in response to the sensed current exceeding the second threshold.

A method, comprising:

• sensing, with current sensing circuitry, a current in a conductor coupled between a power supply and a load;
• generating a current sensing signal indicative of the sensed current;
• emulating, with current squared times time (I2t) circuitry, an I2t curve of the conductor,
• determining whether the sensed current exceeds the I2t curve of the conductor;
• testing, with self-testing circuitry, a current sensing function of the current sensing circuitry;
• and
• generating a test signal indicating a result of the test.