Chipset offers accurate solution for smart meters

Chipset offers accurate solution for smart meters

The STPMC1 and STPMS1/S2 metering chips offer a new modular approach that will offer greater accuracy and reduced costs in the development of polyphase smart meters, supporting 50 to 60 Hz IEC and ANSI standards for up to 0.2-class ac watt meters. The STMPC1 metrology IC, which has five input channels, accepts measurements from three phases with the option of using the fourth channel for tamper detection or temperature sensing, and the fifth channel to accept magnetic field information from a Hall sensor. The device can be configured and calibrated for any international distribution standard.

The STPMS1 and STPMS2 are dual-channel delta-sigma modulators that convert analog current and voltage values from each phase and transmit digital data to the STPMC1. They can be placed very close to the current sensor to avoid long analog tracks and high-noise capture. Both feature a VCC supply range of 3.2 to 5.5 V, an internal low-drop regulator at 3 V typ, and a precision voltage reference of 1.23 V and 30 ppm/°C typ. ($4.50 a set in lots of 1,000 — available now.)

By Christina Nickolas
STMicroelectronics , Lexington , MA
Information 781-861-2650
www.st.com