STMicroelectronics has announced the availability of a new device that incorporates all of the core circuitry required to implement fully electronic electricity meters. The STPM01 addresses a wide range of electricity metering requirements, operating as a standalone 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.
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 ADCs, a hardwired dedicated DSP, an SPI interface to an external MCU, a block of 56 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 (3 V) and digital (1,5 V) circuitry.
The flexible and configurable analog front-end allows the device to work with a variety of current sensors, including current transformers, micro-ohm shunts and Rogowski coils. The dedicated DSP performs realtime calculations of active, reactive and apparent power, RMS voltage and current, and line frequency, using innovative algorithms for which ISKRAEMECO has filed patent applications.
For more information contact Simon Churches, Arrow Altech Distribution, +27 (0)11 923 9600, schurches@arrow.altech.co.za
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