NEC Electronics - 8-bit LCD Microcontrollers with Integrated Metrology Engine for Smart Electricity Meters

The new chips will simplify smart meter designs for homes around the world, contributing to efficient energy usage and reducing the emission of greenhouse gases. The 64-pin 78K0/LE3-M microcontroller comes in a 10 millimeter (mm) x 10mm low-profile quad flat package (LQFP) and is designed for single-phase 2-wire electricity meters, while the, 100-pin 78K0/LG3-M microcontroller comes in a 14mm x 14mm LQFP and is designed for single-phase 3-wire electricity meters.

Most of the 2.5 billion electricity meters in use today are primitive electromechanical devices that require manual reading of energy usage. Smart electricity meters, a key component of smart grid systems, have communication capabilities that facilitate automatic meter reading and enable utility providers to manage energy supply and demand, ensuring a stable and efficient power grid.

NEC Electronics’ 78K0/Lx3-M microcontrollers simplify smart electricity meter designs by offering a rich set of integrated analog and digital peripherals. The metrology engine consists of a high-precision 24-bit ΔΣ (delta-sigma) analog-to-digital (A/D) converter; power calculation hardware with calibration capability; power quality management circuits to detect power outages, current peaks, and voltage peaks; and anti-tampering circuits to ensure the integrity of power usage data. The devices also come with an LCD controller, able to drive up to a 160-segment display, and Flash memory ranging from 16 kilobytes (KB) to 60 KB. The 78K0/Lx3-M microcontrollers can manage communication sub-systems through various serial interfaces.