In home appliances, the thermostat is a key element often used for central control. As part of the smart home, this thermostat design enables users to connect to the cloud and increase to a larger size color screen for ease of use. The RA6M3 32-bit microcontroller MCU supports quick cloud connection as well as the LCD controller (LCDC). RA6M3 can also integrate a voice user interface (VUI). Low-power Wi-Fi can support wireless connectivity to the cloud side. And, the color TFT-LCD screen supports a more friendly human-machine interface (HMI).

System Benefits​:

  • High ESD RS-485 and lower power Wi-Fi communication
  • Easy voice recognition and color TFT-LCD support more friendly HMI
  • Isolated AC/DC buck helps to achieve high efficiency and lower EMI




  • Smart thermostat

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4:3 ratio Non-Renesas Component.207 Sheet.44 Sheet.45 Diode.316 Sheet.47 Sheet.48 Sheet.49 Sheet.105 Connector Arrow.140 Connector Arrow Connector Arrow.137 Sheet.1 Sheet.2 Sheet.3 Sheet.4 CN039 CN039 CN039 Temperature & Humidity Sensor Temperature & Humidity Sensor Temperature & Humidity Sensor LCD (TFT-LCD) Block.120 Block.124 TFT-LCD TFT-LCD Sheet.116 Sheet.117 Sheet.118 Sheet.119 Wi-Fi Module Wi-Fi Module Wi-Fi Module RS-485 Transceiver RS-485 Transceiver RS-485 Transceiver Connector double arrow Connector double arrow.126 Vertical Wire Bundle Label Text 10pt.1046 2 2 Sheet.132 Vertical Wire Bundle.133 Label Text 10pt.1046 2 2 Sheet.135 Op Amp Op Amp Op Amp Audio Out Audio Out Audio Out Connector double arrow.139 Connector double arrow.141 Connector Arrow.143 Vertical Wire Bundle.144 Label Text 10pt.1046 2 2 Sheet.146 Connector Arrow.147 Connector 1.163 Connector 1.163.149 Connector Arrow.150 Connector 1.163.151 Connector Arrow.152 Connector 1.163.153 .395 Inductor.300 Sheet.156 Sheet.157 Sheet.158 Transformer.323 Line.841 Line.842 Inductor.49 Sheet.163 Sheet.164 Sheet.165 Diode Diode Diode Connector Arrow.171 Connector Arrow.172 Connector Arrow.173 Connector Arrow.175 Connector 1.163.176 Connector 1.163.177 Connector 1.178 Connector double arrow.179 Connector 2 Microphone Sheet.182 Sheet.183 Mic Sheet.185 Sheet.186 Connector Line Vertical Wire Bundle.188 Label Text 10pt.1046 2 2 Sheet.190 Connector 1.163.191 AC Power Source Sheet.205 Alternating Current Connector Line.208 Connector Line.209 AC/DC AC/DC AC/DC 90V~300VAC 90V~300VAC Input 90V~300VACInput Digital Mic Digital Mic Digital Mic 3.3V/1Amax 3.3V/1Amax 3.3V/1Amax RS-485 RS-485 RS-485 MCU MCU MCU MCU I2C I2C I2C LCDC LCDC LCDC UART1 UART UART UART2 UART UART 12-bit ADC 12-bit ADC 12-bitADC I2S I2S I2S MQTT+TLS MQTT+TLS MQTT+TLS
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