The ACS71020 IC builds upon Allegro’s Hall-effect current sensor IC technology by adding line voltage sensing (to voltage levels > 500VRMS) and a dedicated metrology engine that digitally calculates detected power levels.
This enables the first power monitor IC that can be powered from the same voltage supply as the system microprocessor, without needing 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 out through I²C or SPI.
The IC also includes dedicated pins for voltage zero crossing (suitable for light-dimming applications) and fast overcurrent fault detection (for sensing short-circuits). The ACS71020 eliminates the need for opto-couplers, dual output isolated power supplies and a current sense-resistor in single phase power monitoring applications.
The device is also housed in a single SOIC-16 wide body package that provides a reinforced isolation rating up to 517Vrms. This monolithic IC provides makes it simple to add power monitoring to any AC or DC powered device.
The ACS71020 current sensor IC is programmed at Allegro for optimised accuracy measurement to either +/-15, +/-30, or +/-90A.
