KM3x 32-bit Microcontrollers NXP Semiconductors KM3x 32-bit Microcontrollers are precision metrology MCUs with segment LCDs and are based on Arm® Cortex®-M0+ core. These MCUs provide a low-cost and highly-integrated solution for single-chip one-, two-, and three-phase electricity meters that require powerful 32-bit processing capability, precision-analog, security, and HMI-functionality. The KM3x MCUs provide security with active and passive tamper detection with time stamping and also supports high-precision internal voltage reference with low-temperature drift. These MCUs feature a comprehensive enablement suite including reference designs. Typical applications include energy meters, industrial measurement and sensing, and flow meters (like heat, water, and gas).