Industrial & Communications Business GroupRenesas Electronics Europe

Rev. 1.00

© 2014 Renesas Electronics Europe. All rights reserved.

Easy Polyphase Meter Design10 Reasons to Use Bill it! RX21A Solution Kits

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© 2014 Renesas Electronics Europe. All rights reserved.

Supports Multiple Meter Types

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© 2014 Renesas Electronics Europe. All rights reserved.

Allows Flexible Polyphase Meter Design

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Fully certifiable design0.2s accuracySingle point calibration routine embeddedTested metrology source files includedVery wide maximum ratings ensuring that all types of meter design are covered

© 2014 Renesas Electronics Europe. All rights reserved.

Inclusive Technology Reference Design

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Bill it! includesRX21A polyphase meter reference platform with single point calibrationFully functional 3-phase solid state meter using current transformersFull documentationWindows GUI showing all relevant meter dataMetrology software source code with documentationApplication noteSchematics & BOMPCB layout Gerber files

© 2014 Renesas Electronics Europe. All rights reserved. 5

Based on Award-Nominated MCU Hardware

RX21A microcontrollerSeven independent ADC channels each with its own Programmable Gain Amplifier256-512 kB Flash32-64 kB RAMIntegrated encryption engine

© 2014 Renesas Electronics Europe. All rights reserved.

Comprehensive Meter Technology Platform

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Technology featuresDirect connected, non-isolated, 3-phase plus Neutral CT based meterCurrent range 100mA to 100 AmpsStarting current 10mAAccuracy - IEC 62053-22 class 0.2S and IEC 62053-23 class 2 reactiveNominal phase voltage 230V ±10%Frequency Range 50Hz ± 20%3-phase 4 wire Wye -single-phase 2 wire compatible

© 2014 Renesas Electronics Europe. All rights reserved.

Comprehensive Hardware Design

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Hardware features• Three phase + neutral CT

current sensing• Non-isolated voltage sensing

through resistive divider - meter ground referenced to neutral

• Graphical LCD (SPI)• IEC62056-21 “flag” type

optical interface and isolated virtual COM port

• Three energy pulse output LED’s with opto-isolated SO outputs

• External temperature sensor for RTC & AFE compensation

• Simple linear power supply• Isolated E1 debug interface• Current isolation switches

N P1 P2 P3

ΔΣmodulator +

filterPGA

PGA

PGA

PGA

PGA

PGA

PGA

ΔΣmodulator +

filter

ΔΣmodulator +

filter

ΔΣmodulator +

filter

ΔΣmodulator +

filter

ΔΣmodulator +

filter

ΔΣmodulator +

filter

10-bit DAC

10-bit ADCMUX

1.22V bandgap

Reference generator

VCOMDS

VREFDSH

RTC crystal temperature

sensor

On-chip temperature

sensor

1.5V

Linear regulator

Comparator A

Power switch

0.47F

SCI9: UART

USB to UART interface

RSPI0:SPI LCD

CoG graphics LCD display

64 x 128

RIIC A:I2C EEPROM

xxkB serial EEPROM

Tamper switch

32.768kHzRTC crystal

Thermally coupled

GPIO

RTC and internal

oscillator

1Hz/64Hz

Debug I/F:SCI1 + FINED

Reset generator

3.3V

1.5V linear regulator

3.3V

3.3V

Optional 1.25V precision reference

CPU

3.3V3.3V

switched

10-bit DAC

© 2014 Renesas Electronics Europe. All rights reserved.

Comprehensive Software Design

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Software featuresMeasurement of:• Voltage on each phase and

current on each phase and neutral

• Active, reactive, apparent and harmonic power on each phase

• Single point ADC calibrationTemperature compensation for AFE on PGA and ADC, voltage reference and RTCMultifunction energy pulse outputs for each phase – optical and SO outputLCD graphical displayIEC62056-21 optical portIsolated virtual COM port for configuration and data capture

© 2014 Renesas Electronics Europe. All rights reserved. 9

Accurate & Compliant Software

Metrology software developed to comply with the accuracy requirements defined by IEC62053-22 class 0.2S

Ensures that Bill it! can exceed the requirements of the highest accuracy classification currently available

Metrology software also complies with IEC62053-23, static meters for reactive energy, classes 2 and 3

© 2014 Renesas Electronics Europe. All rights reserved.

Pre-Programmed Metrology Calibration

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Metrology parameters will…Eliminate PGA gain dispersion so multiple gains can be used to increase dynamic range or accuracy while still using single-point calibration in productionIncrease accuracy of on-chip bandgap voltage reference from already good ±30ppm/oC to class leading ±10ppm/oCEliminate temperature dependent drifts within AFEAvailable in RX21A-G included in Bill it! kit

© 2014 Renesas Electronics Europe. All rights reserved.

Designed for Reality

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Reference platform specified for a realistic end-application full-current range – not just an easy to achieve narrow dynamic range!

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Find Out More!

www.renesas.eu/rx21a

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@Renesas_europe

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© 2014 Renesas Electronics Europe. All rights reserved.

Renesas Electronics Europe© 2014 Renesas Electronics Europe. All rights reserved.