Dual-mode power monitoring IC helps troubleshoot by logging events

Claimed to offer an industry leading accuracy of 0.1 per cent error across a 4000:1 range, the MCP39F511A dual-mode power monitoring IC measures both AC and DC modes, says Microchip.

Power calculations and event monitoring are included with a single IC, which contributes to a reduced bill of materials cost and firmware development time, says the company.

Power monitoring has become more prevalent as developers look to monitor product performance and improve energy usage in smart cities and smart homes. To simplify calibration procedures and support most accuracy requirements, two 24-bit delta-sigma ADCs with 94.5 dB of signal-to-noise ratio plus distortion (SINAD) performance and a 16-bit calculation engine are included.

The MCP39F511A is suitable for a range of consumer, IoT and industrial applications. It is able to automatically sense power supply types and switches between AC and DC modes, optimising measurement results. Developers can troubleshoot issues with an on-chip EEPROM that logs critical events, and there is an integrated low-drift voltage reference and internal oscillator to reduce implementation costs.

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 enable designers to add highly accurate power monitoring functions to end applications with minimal firmware development, advises Microchip.

Other 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. 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). The 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.


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