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STMicroelectronics Introduces Smart Metering Solution
New Solution Monitors a Wide Range of Parameters and Allows Remote Meter Reading
STMicroelectronics has announced the availability of a new device that incorporates all of the core circuitry required
to implement fully electronic electricity meters. The STPM01addresses a wide range of electricity metering requirements,
operating as a stand-alone power meter in the simplest low-end equipment or as a peripheral in sophisticated microprocessor-based meters
that support functions such as remote metering, reactive power measurement, multiple tariffs and tamper detection.
Electric utility companies around the world are increasingly looking to replace the traditional electromechanical meter,
which has remained essentially unchanged for over a century, by electronic meters. Among the many advantages of electronic meters
are increased accuracy, reliability and robustness, easy calibration and reconfiguration, and the ability to incorporate advanced functions
such as multi-tariff billing, tamper proofing, pre-payment, power outage detection, power factor measurement and automated meter reading services.
Jointly developed by ST and ISKRAEMECO, one of the world’s largest meter manufacturers, the STPM01 is a standard device
modified from an ASIC solution built for ISKRAEMECO using ST’s advanced BCD6 smart power technology, allowing all of the necessary analog,
digital and power circuits to be integrated on a single chip. The major blocks include analog signal conditioning,
two Analog-to-Digital Converters, a hardwired dedicated Digital Signal Processor (DSP), an SPI interface to an external MCU,
a block of 56 OTP (One Time Programmable) bits for calibration and configuration, a Voltage-to-Frequency converter to drive a
stepper motor display in low-end applications, and two current-limited, low-drop voltage regulators to supply the analog (3V) and
digital (1.5) circuitry.
The flexible and configurable analog front-end allows the device to work with a variety of current sensors, including current transformers,
microOhm shunts and Rogowski coils. The dedicated DSP performs real-time calculations of active, reactive and apparent power,
RMS voltage and current, and line frequency, using innovative algorithms for which ISKRAEMECO has filed patent applications.
The SPI interface is used to control, configure and calibrate the device using the OTP block and to transmit the digital output data
to an external MCU, which handles data collection and management in high-end applications. In addition, the computed power values
are also converted internally into pulses to directly drive stepper motor displays in the most cost-sensitive low-end applications.
The OTP block, which is accessible via a simple PC interface and software, allows fast and accurate calibration of the voltage and
current sensors, phase correction and temperature drift. Additional features of the STPM01 include Live and Neutral wire current monitoring
for tamper detection in secure energy meters; LED drivers to indicate power, tamper detection and no-load conditions;
and a zero-crossing signal that can be used to avoid arcing when switching heavy inductive loads in industrial control applications.
The STPM01 offers high performance in terms of accuracy, allowing full compliance with the IEC62052-11 and IEC62053-2X specifications
for single-phase class 0.5 wattmeters, while a Synchronisation pin also supports three-phase metering applications.
The device operates over a wide range of mains voltage (40-300VRMS) and line frequency (45-65Hz), and can measure up to 200ARMS.
In addition to the lower component cost due to the high level of integration, the STPM01 also reduces hidden manufacturing costs
associated with calibration, thanks to the fast, tamper-proof OTP block.
The STPM01 is supported by two demo boards/reference designs: a Measurement Board that allows the STPM01to operate as a stand-alone
solution for stepper driving, and a Control Board equipped with an ST7 MCU, LCD display and RTC that connects to the Measurement Board
via the SPI to provide a complete solution for medium/high-end applications.
The company's Web site address is www.st.com.
[Reprinted with kind permission from STMicroelectronics - Release Date 20th June, 2005]