Dusseldorf, Germany --- (METERING.COM) --- September 7, 2012 -  The RX21A group of 32-bit microcontrollers (MCUs) for smart meters with advanced functionality has been announced by Renesas Electronics.

The new MCUs are slated to be the first in the industry to combine large flash memory capacity of 512 KB and a 24-bit delta-sigma A/D converter for high resolution measurement.

The RX21A group of MCUs implements in a single chip functions that previously required separate devices, including power measurement, meter control, calculation of electricity charges, and data encryption. This reduces the number of external components required and helps to lower the overall cost.

The key features of the new MCUs include:

  • On-chip peripheral functions for meters, such as 24-bit delta-sigma A/D converter and encryption engine
  • High performance CPU and large memory capacity to support advanced functionality smart meters
  • RX CPU and low power peripheral functions for overall reduced power consumption.

The MCUs include nine product versions for a variety of meter models, allowing common and effective system design. Among these are versions with three, four, and seven 24-bit delta-sigma A/D converter channels to accommodate both single phase and polyphase smart meters. System designers can choose from three on-chip flash memory capacities, 256 KB, 384 KB, and 512 KB, to accommodate the differing billing and communication systems in various countries and regions.

Renesas plans to supply a development support environment, including middleware for power measurement and calibration tools, for the new RX21A group of MCUs. The company will also provide one-stop kit solutions combining the new MCUs with devices such as the PS2513/14 photocouplers to insulate the MCU from the communication interface in smart meter applications.

Samples of the MCUs are available now. Mass production is scheduled to begin in December 2012.