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Energy-measurement ICs output average, instantaneous real power

Posted: 28 Oct 2005     Print Version  Bookmark and Share

Keywords:microchip technology  mcp3905  mcp3906  energy-measurement ic 

The MCP3905 and MCP3906 devices from Microchip Technology Inc. are two fully functional, stand-alone energy-measurement ICs that output average and instantaneous real power. When these analog front ends are paired with a PIC microcontroller (MCU), engineers have a complete, highly accurate solution for single-phase energy measurement in residential power meters and industrial applications, said the press release.

"The MCP390X energy-measurement ICs address the growing market for electronic-based energy meters, particularly in worldwide emerging markets," said Trent Butcher, product-marketing engineer for Microchip's analog and interface product division. "Microchip provides additional features for existing PIC MCU metering designs and a highly attractive system solution for new metering customers."

The new chips each integrate two 16-bit delta-sigma analog-to-digital converters (ADCs), an internal voltage reference, plus all of the digital circuitry needed to calculate average and instantaneous real power from voltage and current channels. The MCP3905 features a programmable gain amplifier (PGA) with a maximum gain of 16. For energy meters requiring higher accuracy, the MCP3906 has a maximum gain of 32. In addition, these solutions meet or exceed the requirements of the International Electrotechnical Commission IEC62053 international energy-metering specifications.

The energy-measurement ICs provide high accuracy, with a 0.1 percent typical measurement error over a 500:1 dynamic range for the MCP3905, and 1,000:1 dynamic range for the MCP3906. A low-drift, on-chip voltage reference ensures that measurements do not change during the life of the energy meter. In addition, the devices offer low current consumption of 4mA, direct drive for both mechanical counters and two-phase stepper motors, a tamper output pin for negative power indication, and an industrial temperature range of -40°C to 85°C.

The MCP3905 and MCP3906 are already available for general sampling and volume production. All device packaging is Pb free.

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