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Energy-measurement IC adapts to various meter designs

Posted: 19 Feb 2007 ?? ?Print Version ?Bookmark and Share

Keywords:energy meter? ADC? energy measurement? Microchip? MCU?

Microchip Technology Inc. has released its MCP3909 energy-measurement IC and reference design for a variety of single- and three-phase industrial and consumer energy meters. The highly accurate IC combines low-power consumption with a SPI interface and active power pulse output, making it adaptable to a wide variety of meter designs.

The MCP3909 IC features two on-board 16bit delta-sigma ADCs that can be accessed through its SPI interface, while simultaneously providing a pulse output with a frequency proportional to the active-power calculation. This simultaneous output of data makes the IC flexible and easy to use, as well as adaptable to a variety of meter requirements, according to the company.

In addition, with its very low 0.1 percent typical measurement error over a 1000:1 dynamic range, the MCP3909 IC easily fits into meter applications requiring high accuracy, and the low supply current of 4mA makes it suitable for many single- and three-phase energy meter designs.

The MCP3909 3-phase energy meter reference design (Part #MCP3909RD-3PH1) includes three MCP3909 ICs, a PIC18F2520 MCU for power calculations and a PIC18F4550 MCU, which provides a USB interface to desktop software. The software package enables meter calibration and the ability to read active and apparent power, as well as RMS current and RMS voltage.

The MCP3909 IC is available in a 24-pin SSOP package and can be purchased for $1.51 each in quantities of 10,000.

Samples can also be ordered. The reference design is expected to be available for purchase next month at a price of $175 each.

- Gina Roos

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