Allegro Microsystems' ACS71020 power monitoring IC greatly simplifies the addition of power monitoring to any AC/DC powered device. By making use of Allegro’s Hall effect-based, galvanically isolated, integrated current sensor technology, reinforced isolation can be achieved. The sensor can be powered from the same supply as the MCU, eliminating the need for multiple power supplies and digital isolation ICs.

The isolated current measurement is done by detecting the magnetic field from the integrated conductor, eliminating the need for external sense resistors, current transformers, or Rogowski coils. Two Hall plates are used for this measurement to deferentially sense the field, thus eliminating errors due to stray magnetic fields. Multiple parameters like bandwidth, averaging time, and fault levels are user-programmable.

The ACS71020 is provided in a small, low-profile, surface-mount SOIC-16 wide-body package. The ACS71020 is lead (Pb)-free, and is fully calibrated prior to shipment from the factory. Further customer calibration in application can improve accuracy.