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Power Monitoring IC for High-Accuracy Power Measurement

Microchip Technology recently expanded its power-monitoring IC portfolio with the addition of the MCP39F511. The highly integrated and accurate single-phase power-monitoring IC is designed for the real-time measurement of AC power. It combines the most popular power calculations with unique advanced features, making it well suited for use in high-performance commercial and industrial products (e.g., lighting systems, smart plugs, power meters, and AC/DC power supplies).

Source: Microchip Technology

Source: Microchip Technology

To address industry requirements for better accuracy across current loads, additional power calculations, and event monitoring of various power conditions, the MCP39F511 power-monitoring IC provides all of the popular standard power calculations combined with advanced features. The import and export of active energy accumulation, four-quadrant reactive energy accumulation, zero-crossing detection and dedicated PWM output have now been integrated on-chip, along with the ability to measure active, reactive and apparent power, RMS current and RMS voltage, line frequency, and power factor.

Allowing for more accurate power measurements, which is critical to higher-performance designs, this new device is capable of just 0.1 % error across a wide 4000:1 dynamic range. Additionally, its 512 bytes of EEPROM allow operating-condition storage. The MCP39F511 also includes two 24-bit delta-sigma ADCs with 94.5 dB of SINAD performance, a 16-bit calculation engine, and a flexible two-wire interface. A low-drift voltage reference, in addition to an internal oscillator, is integrated to reduce implementation costs. This unique combination of features and performance allows designers to add highly accurate power-monitoring functions to their end applications with minimal firmware development, speeding development time.

The MCP39F511 is supported by Microchip’s MCP39F511 Power Monitor Demonstration Board (ADM00667), which costs $150. The MCP39F511 is available now for sampling and volume production, in a 28-lead, 5 × 5 mm QFN package. It costs $1.82 each in 5,000-unit quantities.

Source: Microcchip Technology


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