NXP Semiconductors has rolled out the EM773 energy metering IC – the world‘s first 32-bit ARM-based solution designed specifically for non-billing electricity metering applications.
The chip takes energy metering beyond the traditional billing context, by making it easy for system designers to integrate energy metering functionality into almost any type of device, and make information on electricity consumption more accessible and intuitive for the end user. With the EM773, consumers and industrial users can monitor energy consumption in real-time, in devices ranging from smart plugs, smart appliances and green consumer electronics, to building sub-meters, industrial sub-meters, and even clusters of rack-mounted servers in the data centre.
Featuring a metrology engine with automatic single-phase, power and energy measurement, the EM773 includes an API which simplifies the design of non-billing metering applications. By using the powerful ARM Cortex-M0 platform, the device is able to support complex communication tasks such as running a feature-rich Wireless M-bus stack, so that data on energy use can be transmitted quickly throughout the home or business, and displayed on other devices such as PCs and smartphones. The standard demonstration kit for the EM773 ships with a wireless plug meter transmitting data from the metrology engine via the Wireless M-bus to a USB-based dongle.
The NXP metrology engine, which is accessible via a simple API, automatically calculates active power in Watts within one percent accuracy; the engine also calculates reactive power, apparent power, the power factor ratio, and even THD (total harmonic distortion). In addition, data on kilowatt hours (kWh) is integrated into the open-source plug meter application that ships with the energy metering IC demo kit, and can be transmitted to and displayed on a PC.
The 32-bit Cortex-M0 platform provides system designers with performance of up to 48 MHz. With 32 KB of flash and 8 KB SRAM memory, the EM773 supports complex customer application software.
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