RX21A reference design
Renesas Electronics has introduced a reference design for a smart meter, which incorporates metrology and calibration routines, required for a billing polyphase meter design.
The hardware platform is based on the firm’s RX21A microcontroller with a metrology front end circuit and the application processor in a single chip. The RX21A MCUs incorporate three, four or seven independent 24-bit delta-sigma analogue-digital converters (ΔΣ-ADC).
Designed to accommodate single-phase, split-phase and three-phase plus neutral billing electricity meters respectively, the ΔΣ-ADC channels include a programmable gain amplifier (PGA), which allows the target meter to cover a dynamic range between 10mA and 100A at enhanced temperature range.
By storing calibration data in the flash, the RX21A devices cover applications better than Class 0.2S, thus exceeding the most stringent IEC metering requirement presently available, the IEC62053-22.
Called “Bill It!” Smart Meter RX21A, the design is built and supported entirely in Europe, and fulfils all required Cenelec standards for EMC and safety.
The design includes an intuitive PC graphical user interface (GUI), providing engineers during the design phase with all the information they need to trim and analyse the data measured by the ΔΣ-ADC channels. This covers both graphical feedback from the ADC data as well as prepared data after the calibration steps, frequency analysis and separation of active/reactive energy use.
Each kit contains the Bill It! Polyphase Meter, a CD-ROM including the embedded metrology and calibration software source code, the PC GUI, the board schematics, the bill of materials, Gerber files, user manual, quick start guide and the electrical connection setup needed to use the electricity meter.
The availability of the new RX21A kit implements the next step in Renesas strategy of being a solution provider. It does this by providing all the required components, comprising both hardware and software, to enable designers and engineers to re-use proven solutions for their target application, reduce costs and accelerate their time to market. Renesas will be launching additional kits over the coming months to continue the implementation of this strategy.
The new “Bill It!” solution kit will to be launched by Renesas at Electronica 2014 in November (Hall A6, Stand 243).
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