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GENEVA, SWITZERLAND: STMicroelectronics has introduced a family of energy-metering ICs that incorporate all core circuitry necessary to implement a complete meter system without requiring any other active component.
The STPM1x family, measuring active energy as pulse frequency output and featuring fast digital calibration, provides electronic meter manufacturers with a complete, cost-effective series of power-metering chips specifically designed for low-end applications.
Fully compliant with specs for single-phase, class 0.5 static meters, the STPM1x provides fast and easy digital calibration at only one point over the entire current range, allowing a drastic reduction in manufacturing costs, when compared to hardware calibration made using a resistor network. The mixed-signal IC is designed for effective measurement of active energy in a power-line system using a wide variety of current sensors such as shunts, current transformers, and Rogowsky coils.
Analog blocks within the STPM1x include preamplifiers for signal conditioning, analog-to-digital converters, and low-drop voltage regulators to supply the circuitry.
In the digital part of the device, the hardwired DSP uses innovative, ripple-free computation algorithms to calculate the amount of consummated active energy, considerably reducing the meter’s calibration time. In addition, active energy is available through complementary pulsed outputs, which enable an easier energy measurement while directly driving stepper-motor counters in low-end applications.
The device is configured and calibrated through a serial port, which exploits the one-time programmable (OTP) cells for permanently storing calibration parameters, hence preventing any subsequent tamper.