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Voice Over Power Line Communication

Overview

Utilizing Renesas' third generation of market-leading power line communication (PLC) modem technology, this design effectively transmits voice over low-voltage power lines. The microphone and speaker are controlled by an MCU, which communicates with the CPX3/CPX4 modem IC. A synchronous step-down buck controller converts an unregulated rectified input voltage to produce a 12V bus for the line driver. Additionally, a 500mA synchronous buck regulator reduces the 12V to 3.3V to power the MCU and modem IC. An LDO generates a very low noise power rail for the codec, while a quad op amp is used for microphone amplification and output level indication.

System Benefits:

  • Compatible with any PLC protocol standard, such as PRIME 1.3.6/1.4 and G3
  • Low-power design ensures high efficiency in a compact space
  • MCU operates up to 120MHz with low power usage and features up to 2MB of on-chip flash and 640KB of RAM

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4:3 ratioSheet.1Sheet.2Sheet.3Sheet.4US013US013US013DC/DC 1DC/DCDC/DCGround (earth)Sheet.25Sheet.26Sheet.27Sheet.28Speakerspeaker_8_Sheet.31Sheet.32Sheet.33Sheet.34MicrophoneSheet.36Sheet.37Ground (earth).38Sheet.39Sheet.40Sheet.41Sheet.42Inductor Coreless (Air conductor)Sheet.45Sheet.46Sheet.47Sheet.48Sheet.49Sheet.50Sheet.51Sheet.52Sheet.53Capacitor Non-polarizedSheet.72Sheet.73Sheet.74Sheet.75Diode LED RedSheet.86Sheet.87Sheet.88Sheet.89Darlington.651Sheet.91Darlington.254Sheet.93Sheet.94Diode LED GreenSheet.96Sheet.97Sheet.98Sheet.99Darlington.651Sheet.101Darlington.254Sheet.103Sheet.104Ground (earth).132Sheet.133Sheet.134Sheet.135Sheet.136Ground (earth).137Sheet.138Sheet.139Sheet.140Sheet.141Ground (earth).142Sheet.143Sheet.144Sheet.145Sheet.146Sheet.149Sheet.150Microphone GainMicrophone GainMicrophone GainU1AU1AU1AU1BU1BU1BMicrophoneMicrophoneMicrophoneSheet.156Sheet.164Sheet.165 3.3VDC3.3VDC3.3VDCSheet.167Sheet.168Sheet.169DC/DC 2DC/DCDC/DCSheet.171Connector 1.169Connector 1.169.173Sheet.174Sheet.175Sheet.176Sheet.180Sheet.181Sheet.182Sheet.183Sheet.184Connector 1.169.185Sheet.186Sheet.187Sheet.188Sheet.189Sheet.191Connector 1.192Sheet.193Capacitor Non-polarized .196Sheet.197Sheet.198Sheet.199Sheet.200Sheet.201Connector 1.202Sheet.203Sheet.204Sheet.205 3.3V A3.3V A3.3V A 3.3VDC3.3VDC3.3VDCC2C2C2C1C1C11.8VDC LDO1.8VDC LDO1.8VDC LDO1.8VDC1.8VDC1.8VDC3.3V A3.3V A3.3V ASheet.213Sheet.214Sheet.215Sheet.216Analog PowerAnalog PowerAnalog PowerResistor - Fixed.219Sheet.221Resistor - FixedResistor - Fixed.218Sheet.220Sheet.222Sheet.223Sheet.224Sheet.225Sheet.226 3.3V A3.3V A3.3V ASheet.228Connector 1.169.229Sheet.230Sheet.231Connector 1.169.232Sheet.233Connector 1.234Sheet.235Resistor - FixedResistor - Fixed.218Sheet.238Sheet.239Sheet.241Sheet.242Sheet.243Sheet.244Sheet.245SpeakerSpeakerSpeaker U1CU1CU1C U1DU1DU1DOUTPUT Level IndicatorOUTPUT Level IndicatorOUTPUT Level IndicatorSheet.250Sheet.253Resistor - Fixed.255Sheet.256GREENGREENGREENREDREDREDSheet.260Sheet.266GPIOGPIOGPIOGPIO (BOOT Mode)GPIO (BOOT Mode)GPIO (BOOT Mode)IRQ#IRQ#IRQ#RESET# (GPIO)RESET# (GPIO)RESET# (GPIO)RXDRXDRXDTXDTXDTXDSheet.273Sheet.274Sheet.275Sheet.276Sheet.277Sheet.278Connector 1.169.279Sheet.280Sheet.281Line InterfaceLine InterfaceLine InterfaceSheet.283Sheet.284Sheet.285Pmod Debug UARTPmod Debug UARTPmod Debug UARTSheet.287Serial FLASHSerial FLASHSerial FLASHSheet.289Sheet.290Sheet.291Sheet.292Sheet.294Sheet.295Sheet.296Sheet.297Sheet.298DC BusDC BusDC BusNon-Renesas Component.300Sheet.301Sheet.302Sheet.303Sheet.304Connector 1.169.305Connector 1.169.306Sheet.307Sheet.308Sheet.309Sheet.310 DC BusDC BusDC BusNon-Renesas Component.312Sheet.313Sheet.314Connector 1.315Connector 1.316Sheet.317Bridge RectifierBridge RectifierBridge RectifierSheet.319Sheet.320Sheet.32112VDC12VDC12VDCSheet.323Sheet.324Sheet.327Sheet.328Sheet.32913-48VDC13-48VDC13-48VDC12S CODEC Amplifier12S CODEC Amplifier12S CODEC AmplifierOp Amp1Op AmpOp AmpOp Amp2Op AmpOp AmpMCUMCUMCUMCUADCADCADC SCISCISCII2CI2CI2C SCISCISCICPX3CPX3/CPX4CPX3/CPX4CPX3/CPX4 RXDRXDRXD TXDTXDTXD SPISPISPI SCISCISCILine DriverLine Driver x2Line Driver x2Op Amp3Op AmpOp AmpOp Amp4Op AmpOp Amp

DC/DC

Buck Regulators (Integrated FETs)

DC/DC

Buck Controllers (External FETs)

Op Amp

Precision Op Amps (Vos <1mV)

Op Amp

Precision Op Amps (Vos <1mV)

MCU

RX 32-Bit Performance/Efficiency MCUs

CPX3/CPX4

PLC Modem ICs

Op Amp

Precision Op Amps (Vos <1mV)

Op Amp

Precision Op Amps (Vos <1mV)

1.8VDC LDO

Linear Regulators (LDO)

Line Driver

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