Smart Home Energy Monitoring Chip Reduces BOM Cost

energy monitoring

New energy monitoring chip for real-time power measurement of AC and DC power supplies with high accuracy 

Accurate energy consumption monitoring is becoming increasingly important in smart home and smart city applications to reduce energy usage. Growing applications such as solar inverters, smart lighting and cloud servers often use both AC and DC power to maintain safe operation, with AC as the main power source and DC as backup or vice versa. In such systems, the implementation of dual-mode power monitoring traditionally requires multiple integrated circuits (ICs) to ensure superior performance and accuracy.

To optimize performance and ease development of these systems, Microchip has released a flexible dual-mode power monitoring integrated circuit (IC) that measures both AC and DC modes with an industry-leading accuracy of 0.1 percent error across a wide 4000:1 range.


The new MCP39F511A includes power calculations and event monitoring in a single IC, reducing bill of materials cost and firmware development time, claims Microchip.

Dual-mode energy monitoring chip offers high accuracy

The chip simplifies calibration procedures and supports most accuracy requirements with two 24-bit delta-sigma Analog-to-Digital Converters (ADCs) with 94.5 dB of signal-to-noise ratio plus distortion (SINAD) performance and a 16-bit calculation engine.

The solution is suitable for a range of consumer, internet of things (IoT) and industrial applications. It automatically senses power supply types and switches between AC and DC modes, optimizing measurement results.

The device also helps developers troubleshoot issues with an on-chip EEPROM that logs critical events, as well as an integrated low-drift voltage reference and internal oscillator to reduce implementation costs.

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Other benefits of using the MCP39F511A include its flexibility and ease of implementation. The device 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, which enable designers to easily add highly accurate power monitoring functions to end applications with minimal firmware development.

Advanced features include 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.

In addition, event monitoring of various power conditions also enhances preventative system maintenance and enables developers to better manage power consumption.

“Power monitoring has become more prevalent in growing markets such as smart cities and smart homes as developers look to monitor product performance and improve energy usage,” said Bryan Liddiard, vice president of Microchip’s Mixed-signal and Linear Products Division. “The MCP39F511A provides customers with a simplified development path and the ability to monitor both AC and DC power supplies with industry-leading accuracy.”


  • Power supplies for servers, networking, and storage equipment
  • Home monitoring IoT devices like smart plugs and appliances
  • Uninterruptible power supplies
  • Industrial power meters and power quality monitoring
  • Commercial lighting, street lighting, and LED (light emitting diode) lighting applications

Development Tools

The device is supported by the MCP39F511A Power Monitor Demonstration Board (ADM00667), a fully functional single-phase power and energy monitoring system. The 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” that offers automated control to allow users to easily evaluate all system configuration settings.

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The MCP39F511A is available in 10,000-unit quantities. The MCP39F511A Power Monitor Demonstration Board (ADM00667) is also available for purchase.



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