The dual-mode power monitoring IC (PMIC) has what is claimed to be an industry-leading accuracy of 0.1% across a wide 4000:1 range. Power calculations and event monitoring are included in the IC, reducing bill of materials cost and firmware development time, adds the company.

The PMIC addresses the growing need for more accurate power measurements in smart cities and smart homes, to monitor product performance and improve energy usage. To simplify calibration procedures and support most accuracy requirements, two 24bit delta-sigma ADCs with 94.5 dB of signal to noise ratio plus distortion (SINAD) performance and a 16bit calculation engine are included. The IC automatically senses power supply types and switches between AC and DC modes, optimising measurement results for consumer, Internet of Things (IoT) and industrial applications. An on-chip EEPROM logs critical events to help troubleshoot development areas while an integrated low-drift voltage reference and internal oscillator reduce implementation costs.

The IC provides standard power calculations such as active, reactive and apparent power, active and reactive energy, root-mean-square (RMS) current and voltage, line frequency and power factor, to enable designers to easily add highly accurate power monitoring functions to end applications with minimal firmware development, explains the company.

It also integrates features such as auto-save and auto-load of power quantities to and from the EEPROM at power loss or start, ensuring that measurement results are never lost if power is disrupted unexpectedly. Event monitoring of various power conditions enhances preventative system maintenance and enables developers to better manage power consumption.

The device is supported by the MCP39F511A Power Monitor Demonstration Board (ADM00667). This single-phase power and energy monitoring system calculates and displays active power, reactive power, RMS current, RMS voltage, active energy (both import and export) and four-quadrant reactive energy. It connects easily through USB to the Power Monitor Utility Software which provides automated control to allow users to easily evaluate all system configuration settings.