Overview

Renesas has a rich lineup of control microcontrollers for single-phase meters. The RL78/I1B Group, RL78/I1C Group and RX21A Group with a built-in 24-bit ΔΣ(delta-sigma) ADC help to reduce costs and external components. The RL78/I1C Group and RX21A Group also support enhanced security functions. Renesas offers low-cost and low power consumption microcontrollers such as the RL78/L1x Series, RX210 Group, and RX220 Group when using an external ΔΣADC. Renesas also offers a lineup of microcontrollers with built-in Sub-GHz and Power Line Communication (PLC) functions essential to smart meter.

Electronic power meter  (Single-Phase)

System Block Diagram (Main Control Block: MCU with Embedded ΔΣADC)

System Block Diagram (Main control block: MCU with embedded ΔΣADC)

System Block Diagram (Main Control Block: MCU with no Embedded ΔΣADC)

System Block Diagram (Main control block: MCU with no embedded ΔΣADC)

System Block Diagram (Sensor and Power Supply Block)

System Block Diagram (Sensor and power supply block)

Recommended Products
Block Semiconductor device Recommended products Features, etc.
Control MCU MCU
(ΔΣADC integrated)
RL78/I1B Group 16-bit CPU, 24-bit ΔΣADC, LCD controller/driver, battery back up
RL78/I1C Group 16-bit CPU, 24-bit ΔΣADC, LCD controller/driver, battery back up, AES
RX21A Group 32-bit CPU, high capacity memory, DataFlash
24-bit ΔΣADC (7units, SNDR 85dB) 
MCU RL78/L1x Series LCD driver, ultra low power consumption
RX210 Group 32-bit CPU (50MHz max), high capacity memory
RX220 Group 32-bit CPU (32MHz max), low pin count
Communication control block MCU RL78/G13 Group 16-bit CPU
RX210 Group 32-bit CPU (50MHz max), high capacity memory,
low power, max 7ch communication function
RX220 Group 32-bit CPU (32MHz max), low pin count,
low power, max 5ch communication function
RX631 Group 32-bit CPU
RS485 signal I/F Photocoupler
(standard)
PS23xx Series
PS27xx Series
PS28xx Series
High isolation voltage (5kVr.m.s.), 4p-LSOP, Ta=115°C
High isolation voltage (3.75kVr.m.s.), 4p-SOP, Ta=110°C
High isolation voltage (2.5kVr.m.s.), 4p-SSOP, Ta=110°C
Photocoupler
(high-speed)
PS91xx Series
(SOP)
PS93xx Series
(SDIP)
PS98xx Series
(Small SOP)
PS99xx Series
(LSDIP)
Digital output   
~15Mbps
Low supply current
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