Hall Effect-Based Linear Current Sensor

Feature

The ACS712 provides economical and precise solutions for AC or DC current sensing in industrial, automotive, commercial, and communications systems. The device consists of a precise, low-offset, linear Hall sensor circuit with a copper conduction path located near the surface of the die. Applied current flowing through this copper conduction path generates a magnetic field which is sensed by the integrated Hall IC and converted into a proportional voltage. Device accuracy is optimized through the close proximity of the magnetic signal to the Hall transducer. The output of the device has a positive slope (>VIOUT(Q))when an increasing current flows through the primary copper conduction path (from pins 1 and 2, to pins 3 and 4), which  is the path used for current sensing. The internal resistance of this conductive path is 1.2 m