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Microchip Releases Dual Mode Power Monitoring IC

The MCP39F511A Automatically Switches Between AC and DC Power Measurement Modes

In systems that use both AC and DC power, the implementation of dual-mode power monitoring traditionally requires multiple ICs to ensure superior performance and accuracy. Growing applications such as solar inverters, smart lighting and cloud servers often use both modes to maintain safe operation, with AC as the main power source and DC as backup or vice versa. To optimize performance and ease development of these systems, Microchip has released a flexible dual-mode power monitoring IC that measures both AC and DC modes with industry-leading accuracy of 0.1 percent error across a wide 4000:1 range. Power calculations and event monitoring are included with a single IC, reducing bill of materials cost and firmware development time.

Click for Larger Image - Microchip MCP39F511A Power Monitoring IC The MCP39F511A power monitoring IC is a highly integrated device that addresses the growing need for more accurate power measurements in high-performance designs. To simplify calibration procedures and support most accuracy requirements, 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 are included. Suitable for a range of consumer, Internet of Things (IoT) and industrial applications, the MCP39F511A 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.

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. To further simplify development efforts, the MCP39F511A includes advanced 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 also enhances preventative system maintenance and enables developers to better manage power consumption.

Click for Larger Image - Microchip MCP39F511A Power Monitoring IC Block Diagram “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.”

Features of the MCP39F511A Power Monitoring IC

  • Real-Time Measurement of Input Power for AC or DC Supplies
  • Power Monitoring Accuracy capable of 0.1% error across 4000:1 dynamic range
  • Automatic Sensing and Switching Between AC and DC Modes
  • Built-In Calculations:
    • Active, Reactive, Apparent Power
    • Active and Reactive Energy Accumulation
    • True RMS Current, RMS Voltage
    • Line Frequency, Power Factor
  • Dedicated Zero Crossing Detection (ZCD) Pin
  • Dedicated PWM Output Pin
  • Automatic Event Pin Control through Fast Voltage Surge Detection
  • Fast Calibration Routines
  • 2-wire UART: Baud Rate up to 115.2kbps
  • 512 bytes User-accessible EEPROM through page read/write commands
  • Low-Drift Internal Voltage Reference: 10 ppm/°C typical
  • 28-lead 5x5 QFN package
  • Extended Temperature Range -40°C to +125°C
  • AEC-Q100 qualified

More information on the MCP39F511A Power Monitoring IC can be found on the Microchip Web site at Microchip MCP39F511A product page

Note: The Microchip name and the Microchip logo are registered trademarks of Microchip Technology Incorporated in the U.S.A and other countries. All other trademarks mentioned herein are the property of their respective companies.

The company's Web site address is www.microchip.com
[Reprinted with kind permission from Microchip Corporation - Release Date, 30th July, 2018]