The document describes Renesas Electronics' Bill it! RX21A solution kits for easy polyphase meter design. The kits include hardware, software and documentation to create accurate electricity meters using the RX21A microcontroller. Key features of the kits are supporting multiple meter types, allowing flexible design, and including an inclusive technology reference design, comprehensive hardware and software designs, and pre-programmed metrology calibration.

1. Easy Polyphase Meter Design
10 Reasons to Use Bill it! RX21A Solution Kits
Renesas Electronics Europe
Industrial & Communications Business Group
Rev. 1.00
© 2014 Renesas Electronics Europe. All rights reserved.
1

2. Supports Multiple Meter Types
© 2014 Renesas Electronics Europe. All rights reserved.
2

3. Allows Flexible Polyphase Meter Design
© 2014 Renesas Electronics Europe. All rights reserved.
3
Fully certifiable design
ƒ 0.2s accuracy
ƒ Single point calibration
routine embedded
ƒ Tested metrology source
files included
ƒ Very wide maximum ratings
ensuring that all types of
meter design are covered

4. Inclusive Technology Reference Design
© 2014 Renesas Electronics Europe. All rights reserved.
4
Bill it! includes
ƒ RX21A polyphase meter
reference platform with
single point calibration
ƒ Fully functional 3-phase
solid state meter using
current transformers
ƒ Full documentation
ƒ Windows GUI showing all
relevant meter data
ƒ Metrology software source
code with documentation
ƒ Application note
ƒ Schematics & BOM
ƒ PCB layout Gerber files

5. Based on Award-Nominated MCU Hardware
© 2014 Renesas Electronics Europe. All rights reserved. 5
RX21A microcontroller
ƒ Seven independent ADC
channels each with its own
Programmable Gain
Amplifier
ƒ 256-512 kB Flash
ƒ 32-64 kB RAM
ƒ Integrated encryption
engine

6. Comprehensive Meter Technology Platform
© 2014 Renesas Electronics Europe. All rights reserved.
6
Technology features
ƒ Direct connected, non-isolated,
3-phase plus
Neutral CT based meter
ƒ Current range 100mA to
100 Amps
ƒ Starting current 10mA
ƒ Accuracy - IEC 62053-22
class 0.2S and IEC 62053-
23 class 2 reactive
ƒ Nominal phase voltage
230V ±10%
ƒ Frequency Range 50Hz
± 20%
ƒ 3-phase 4 wire Wye -
single-phase 2 wire
compatible

7. Comprehensive Hardware Design
© 2014 Renesas Electronics Europe. All rights reserved.
7
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
ΔΣ
modulator +
filter
VREFDSH
PGA
PGA
PGA
PGA
PGA
PGA
PGA
ΔΣ
modulator +
filter
ΔΣ
modulator +
filter
ΔΣ
modulator +
filter
ΔΣ
modulator +
filter
ΔΣ
modulator +
filter
ΔΣ
modulator +
filter
10-bit DAC
MUX 10-bit ADC
1.22V
bandgap
Reference
generator
VCOMDS
RTC crystal
temperature
sensor
On-chip
temperature
sensor
1.5V
Linear
regulator
Comparator A
Power
switch
0.47F
RTC and
internal
oscillator
1Hz/64Hz
SCI9:
UART
Thermally
coupled
32.768kHz
RTC crystal
USB to UART
interface
RSPI0:
SPI LCD
CoG graphics
LCD display
64 x 128
RIIC A:
I2C EEPROM
xxkB serial
EEPROM
Tamper
switch
GPIO
Debug I/F:
SCI1 + FINED
Reset
generator
3.3V
1.5V linear
regulator
3.3V
3.3V
Optional 1.25V
precision
reference
CPU
3.3V
3.3V
switched
10-bit DAC

8. Comprehensive Software Design
© 2014 Renesas Electronics Europe. All rights reserved.
Software features
ƒ Measurement of:
8
• Voltage on each phase and
current on each phase
and neutral
• Active, reactive, apparent and
harmonic power on each phase
• Single point ADC calibration
ƒ Temperature compensation for
AFE on PGA and ADC, voltage
reference and RTC
ƒ Multifunction energy pulse
outputs for each phase
– optical and SO output
ƒ LCD graphical display
ƒ IEC62056-21 optical port
ƒ Isolated virtual COM port for
configuration and data capture

9. Accurate & Compliant Software
© 2014 Renesas Electronics Europe. All rights reserved. 9
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

10. Pre-Programmed Metrology Calibration
© 2014 Renesas Electronics Europe. All rights reserved.
10
Metrology parameters will…
ƒ Eliminate PGA gain
dispersion so multiple gains
can be used to increase
dynamic range or accuracy
while still using single-point
calibration in production
ƒ Increase accuracy of on-chip
bandgap voltage
reference from already good
±30ppm/oC to class leading
±10ppm/oC
ƒ Eliminate temperature
dependent drifts within AFE
ƒ Available in RX21A-G
included in Bill it! kit

11. Designed for Reality
© 2014 Renesas Electronics Europe. All rights reserved.
11
Reference platform specified
for a realistic end-application
full-current range – not just
an easy to achieve narrow
dynamic range!

12. Find Out More!
© 2014 Renesas Electronics Europe. All rights reserved. 12
www.renesas.eu/rx21a
RenesasPresents
@Renesas_europe
Renesas Europe
Renesas Europe

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