STPMC1 Programmable Energy Calculator IC STMicroelectronics STPMC1 Programmable Poly-Phase Energy Calculator IC is an ASSP designed for effective energy measurement in power line systems utilizing Rogowski, current transformer, Shunt or Hall current sensors. The STPMC1 implements all the functions needed in a 1-, 2- or 3-phase energy meter when combined with one or more STPMSx ICs. Additionally, the STPMC1 Energy Calculator IC can be coupled with a microprocessor for multi-function energy meters, or can directly drive a stepper motor for a simple active energy meter.