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ST addresses needs of electronic power meter market

Posted: 23 Aug 2005 ?? ?Print Version ?Bookmark and Share

Keywords:stmicroelectronics? reference design platform? electronic power meter?

Targeted at electronic power meters

STMicroelectronics introduced a reference design platform targeted at the emerging market for electronic power meters. The new reference platform provides a modular solution that can be adapted by software to meet the utility company's particular needs. It comprises two PCBs, one dedicated to the mains power measurement functions and one implementing sophisticated computational and supervisory functions. The measurement board supports all current measurement technologies, from the most accurate Rogowski coils to inexpensive shunt resistors. It can monitor both Live and Neutral current for tamper detection and complies with all international standards, such as IEC-62052-11 and IEC-62053-2x for metering equipment (AC).

The measurement board is based on the company's STPM01 power metering chip, which includes all necessary signal conditioning, signal processing, data conversion, input/output signals and voltage reference. The STPM01 can be used as a stand-alone device in 1-phase kWh meters or as a peripheral in microprocessor-based 1-phase or 3-phase energy meters, in which case active (base and wide), reactive and apparent energy, VRMS, IRMS, instantaneous voltage and current, and line frequency readings are available through the SPI bus.

Meanwhile, the Control Board is based on an ST7 microcontroller (MCU) and is supplied with a library of C-code software, with additional software routines available free of charge from ST's Website. The ST7 MCU communicates with the STMP01 ASSP via the industry standard SPI interface protocol, allowing easy customization of metering functions via the included PC software. The reference design also includes the M41ST87 real-time clock chip, a 256Kb serial SPI bus EEPROM and a dedicated 32-character alphanumeric LCD with on-glass driver.

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