The ACS71020 enhances these popular ICs by including power sensing functions and eliminating power and isolation components that would otherwise increase the cost and size of customer systems.
The ACS71020 IC builds upon Allegro's innovative Hall-effect current-sensing IC technology by adding line voltage sensing (at voltage levels > 500 VRMS) and a dedicated metrology engine that digitally calculates the detected power levels. This enables the first power monitor IC that can be powered from the same voltage supply as the system's microprocessor, eliminating the need for digital isolators or multiple power supplies.
Allegro's new power monitor IC simplifies common power measurements by offering digital computation of parameters including active, reactive, and apparent power. These power values ​​can be read via I²C or SPI. The IC also includes dedicated pins for zero-crossing voltage detection (suitable for light dimming applications) and fast overcurrent fault detection (for short-circuit detection). The ACS71020 eliminates the need for optocouplers, dual-output isolated power supplies, and a current-sensing resistor in single-phase power monitoring applications.
The device is also housed in a single SOIC-16 widebody package that provides a reinforced isolation rating of up to 517 Vrms. This monolithic IC allows power monitoring to be added to any AC- or DC-powered device.
The ACS71020 current sensor IC is programmed in Allegro for optimized accuracy measurements of +/- 15, +/- 30, or +/- 90 A.

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