AC, DC monitoring chip is accurate to 0.1 percent across a wide input range

AC, DC monitoring chip is accurate to 0.1 percent across a wide input range

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By Nick Flaherty

The MCP39F511A also includes power calculations and event monitoring to reduce the hardware bill of materials cost and the firmware development time.

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. To simplify calibration procedures and support most accuracy requirements, the hip uses two 24bit delta-sigma Analogue-to-Digital Converters (ADCs) with 94.5 dB of signal-to-noise ratio plus distortion (SINAD) performance and a 16bit calculation engine. 

The chip is aimed at a range of consumer, Internet of Things (IoT) and industrial applications, automatically sensing power supply types and switches between AC and DC modes and optimising the 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.

It 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.

The MCP39F511A also includes 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.

The device is supported by the MCP39F511A Power Monitor Demonstration Board (ADM00667), costing $150, which is 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

The MCP39F511A is available now.   

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