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Home > Technology List > 1 kHz Bandwidth Power Monitoring IC ACS71020

1 kHz Bandwidth Power Monitoring IC ACS71020

Update Time: 2019-12-20 16:00:40


Allegro recently introduced a fully integrated, small form factor power monitoring IC, the ACS71020, which features enhanced voltage isolation.

The ACS71020 is further enhanced by Allegro's popular current sensor ICs, adding power detection and eliminating the need for power isolation components, reducing the cost and size of customer systems.

The ACS71020 incorporates Allegro's innovative Hall-effect current sensor technology, which adds line voltage detection (voltage levels >500 Vrms) and a dedicated metering engine that digitally calculates the power level to be tested, allowing the same voltage as the system microprocessor Powered by power monitoring, eliminating the need for digital isolators or multiple power supplies, it is the industry's first power monitoring IC with this capability.

Allegro's new power monitoring ICs provide digital calculations including parameters such as active, reactive, and apparent power, simplifying common power measurements that can be read out via I2C or SPI. 

The Power Monitoring IC also features dedicated pins for voltage zero crossing (for dimming applications) and fast overcurrent fault detection (for detecting shorts). 

In single-phase power monitoring applications, optocouplers, dual-output isolated power supplies, and current-sense resistors are no longer required if the ACS71020 is used.

The ACS71020 is available in a single SOIC-16 wide package and provides enhanced isolation up to 517 Vrms. 

This single-chip IC makes it easier to add power monitoring to any AC or DC powered device. 

The ACS71020 current sensor IC has been programmed at the Allegro factory for optimized accuracy measurements with current sensing ranges of ±15A, ±30A, or ±90A.

1 kHz Bandwidth Power Monitoring IC ACS71020


The 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 differentially sense the field, thus eliminating errors due to stray magnetic fields. Multiple parameters like bandwidth,averaging time, and fault levels are user-programmable.

The sensor features all key power measurements, which can be read out through I2C or SPI, as well as dedicated pins for voltage zero crossing (suitable for light-dimming applications) and fast overcurrent fault (for short-circuit detection). 

As the sensor is isolated, these pins can be easily accessed by the MCU without additional isolation to each signal. 

These two pins can also be configured to flag a VRMS under/over voltage.

The ACS71020 is provided in a small, low-profile, surface-mount SOIC16 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. 

Where to  find the ACS71020 datasheet 
Searching for ACS71020 at Google, we will be able to download ACS71020 datasheet directly
Can you introduce related Allegro electronic parts?

Through the introduction of Allegro on Jotrin's official website, we can discover Allegro related electronic products.


• Accurate power monitoring of AC/DC applications
• Reinforced isolation up to 517 VRMS in a single package
eliminates the need for dual isolated supplies (certification
• Active, reactive, and apparent power measurements, and
power factor
• RMS and instantaneous voltage and current measurements
• 0.85 mΩ primary conductor resistance for low power loss
and high inrush current withstand capability
• Dedicated voltage zero crossing pin
• Overcurrent fault output pin
• Hall-effect-based current measurement with commonmode
stray field rejection
• User-programmable VRMS under/overvoltage pin
• 1 kHz bandwidth
• Current-sensing range from 0 to 90 A
• I2C or SPI communication
• User-programmable through EEPROM registers
• 16-bit voltage and current ADCs


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