ACS37800 - Integrated Power Monitoring Chip for Reducing Board Space and Optimizing Energy Efficiency in Industrial and Home Automation Applications

ACS37800 Integrated Power Monitoring Chip from Allegro MicroSystems

Allegro MicroSystems has introduced the ACS37800 a Hall-effect power monitoring IC for single-phase AC and DC solutions in a small PCB footprint. This new integrated power monitoring chip allows simultaneous measurements of power, voltage, and current for AC and DC signals with an isolation rating of up to 1480Vpk. The ACS37800 helps users to track power consumption and to optimize energy use by detecting reduced power efficiency for predictive maintenance. Hence, the device is suitable for motor control, building automation, and a variety of green industrial applications.


The IC is offered in a SOIC16 footprint for reducing the bill of materials (BOM) cost and complexity. The onboard regulator allows the device to be powered with the same voltage supply as the system microprocessor (5V or 3.3V). The ACS37800 simplifies common power triangle measurements by calculating parameters such as the active, reactive, and apparent power as well as instantaneous and RMS values of the current, voltage, or power. The device also averages these parameters with instantaneous measurements over one minute. This reduces the inaccuracies due to asymmetric waveforms.


The ACS37800 offers flexibility and configurability by allowing the users to choose from a factory-programmed I2C or SPI interface, depending on whether the user prefers low noise or multiple addressing. Users can also program thresholds for under/overvoltage, current/voltage gain and offset, and overcurrent trip point via EEPROM, allowing them to optimize their system from ±30 A to ±180 A and from –40°C to 125°C. The samples of ACS37800 are available upon request in your local sales office.


Features of ACS37800 IC

  • Accurate measurements of active, reactive, and apparent power, as well as power factor
  • Separate RMS and instantaneous measurements for both voltage and current channels
  • Two programmable averaging blocks
  • 0.85 mΩ primary conductor resistance for low power loss and high inrush current withstand capability
  • A dedicated voltage or current zero-crossing pin
  • Fast, user-programmable overcurrent fault pin (5 µs typ.)
  • 1 kHz bandwidth
  • Current sensing range up to 90 A
Component Datasheet

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