Power Line Communication (PLC) is a rapidly growing market. Utilizing Renesas’ third generation of market-leading powerline communication modem solutions, this winning combination illustrates how PLC can be used in an IoT application. In this design, the RL78/I1C MCU is utilized to measure the voltage/current/phase of the AC power line. That data is then transmitted over PLC via the RL78/G13 to the CPX3 modem SoC. These devices are powered by the ISL85415 step-down regulator and a Renesas photocoupler is also utilized to detect zero-crossings and to protect the CPX3 from potential voltage spikes.

System Benefits:

  • Can be used for any PLC protocol standard, such as PRIME 1.3.6/1.4 and G3
  • Low-power design delivers high efficiency in a small space
  • RL78/I1C is designed specifically for the needs of the smart electricity meter market
  • PS2561F-1 photocoupler provides 5000Vrms isolation voltage and high-speed switching



Winning Combinations Interactive Diagram

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4:3 ratio Sheet.26 Sheet.27 Sheet.1 Sheet.2 Sheet.3 Sheet.4 US012 US012 US012 CPX3 CPX3 CPX3 Buck Regulator Buck Regulator Buck Regulator Photocoupler Photocoupler Photocoupler TX Filter TX Filter TX Filter RX Filter RX Filter RX Filter Serial FLASH Serial FLASH Serial FLASH Line Interface & Step Down Circuit Line Interface & Step Down Circuit Line Interface & Step Down Circuit Analog Signal Line Conditioning Analog Signal Line Conditioning Analog Signal Line Conditioning Ground Sheet.23 Sheet.24 Sheet.25 Sheet.28 Sheet.29 Sheet.30 Sheet.31 Sheet.32 Sheet.33 Sheet.34 Sheet.35 Sheet.36 Sheet.37 Sheet.38 Sheet.39 Sheet.40 Sheet.41 Sheet.42 Sheet.43 Sheet.44 Sheet.45 Sheet.46 Sheet.47 Sheet.48 Sheet.49 Sheet.50 Sheet.51 Sheet.52 Sheet.53 Sheet.54 Sheet.55 Sheet.56 Sheet.57 Sheet.58 Sheet.59 12V 12V 12V TXD TXD TXD RXD RXD RXD Zero-Cross Detect Zero-Cross Detect Zero-Cross Detect 12V 12V 12V Connector 1.157 Connector 1.157.67 3.3V 3.3V 3.3V *Running Communications Task **Running ADC Task *Running Communications Task **Running ADC Task *Running Communications Task **Running ADC Task PHASE_IN PHASE_IN PHASE_IN Sheet.77 NEUTRAL_IN NEUTRAL_IN NEUTRAL_IN Connector 1.157.79 Connector 1.157.80 AGND AGND AGND Current Sense (differential) Current Sense (differential) Current Sense (differential) Line Voltage Sense (differential) Line Voltage Sense (differential) Line Voltage Sense (differential) AC Power Source Alternating Current Sheet.93 Sheet.107 Sheet.103 Label Text 10pt.262.104 = = Socket Socket Socket Sheet.112 Sheet.113 Line In Line In Line In Sheet.115 Sheet.128 Sheet.124 Microcontroller Microcontroller MCU** MCU** AINOP AINOP AINOP AIN1N AIN1N AIN1N AIN1P AIN1P AIN1P AINON AINON AINON MCU MCU MCU* MCU* SCI SCI SCI Line Driver Line Driver Line Driver
Exiting Interactive Block Diagram