ST’s STPMxx family of metering ICs provides highly-accurate measurements of energy parameters including active energy (kWh), apparent energy (kVA), reactive energy (kVAR) and RMS, as required by many applications, including meters, smart plugs and appliances, industrial instruments, monitoring systems and many others. They address both single-phase and poly-phase energy meters up to Class 0.2 accuracy.
STPM01/1x devices for single-phase applications combine accurate analog-to-digital converters (ADCs) with specialized digital signal processing units (DSPs) to perform critical measurements by simply and effectively using different kinds of sensors (current transformers, Rogowsky coils, shunts, Hall sensors). This ensures a flexible architecture that gives the best bill of material optimization.
For poly-phase smart meters, ST has unveiled a modular solution built with a single digital calculator IC (STPMC1) connected to one or more smart sensor ICs (STPMS2) depending on the number of phases. This solution offers greater accuracy and reduced development costs.