Renesas Electronics Corporation
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Furnace Controller with Wi-Fi

Overview

A furnace is a device used to control high-temperature heating. In residential settings, a furnace heats air and distributes it through ductwork to warm the desired spaces. This system features a high-performance MCU with integrated A/D conversion, ensuring precise sensing and control. Built-in functional safety hardware allows the MCU to meet the IEC/UL 60730 safety standard, ensuring safe and reliable operation in home environments. Additionally, efficient power management and Wi-Fi connectivity provide seamless remote monitoring and control, delivering smart, connected performance for modern HVAC systems.

System Benefits:

  • High-integration 32-bit MCU with 12-bit A/D for enhanced precision and compact control.
  • Galvanically isolated high-speed differential bus transceiver for reliable bi-directional data communication on balanced transmission lines.
  • Smart residential HVAC systems
  • Connected thermostat systems

Block Diagram

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Template 1 Connector dotted line Connector dotted line.82 Connector dotted arrow.54 Connector dotted arrow.55 Connector Arrow.56 Gas Sensor Gas Sensor Gas Sensor Wi-Fi Wi-Fi Wi-Fi Safety Limit Switch Safety Limit Switch Safety Limit Switch High Pressure Sensor High Pressure Sensor High Pressure Sensor Low Pressure Sensor Low Pressure Sensor Low Pressure Sensor Flame Roll-Out Switch Flame Roll-Out Switch Flame Roll-Out Switch Flame Sensor Flame Sensor Flame Sensor Igniter Igniter Igniter 24 VAC 24VAC 24VAC RS-485 Bus RS-485 Bus RS-485 Bus Draft Inducer & Blower Fan Motor Draft Inducer & Blower Fan Motor Draft Inducer & Blower Fan Motor CO Sensor CO Sensor CO Sensor Connector Arrow Connector Arrow.36 Connector Arrow.37 Connector Arrow.38 Connector dotted arrow Connector dotted arrow.41 Connector dotted arrow.42 Connector dotted arrow.43 Connector Arrow.44 Bi-directional Connector 1.160 7mA 7mA 7mA ~300mA ~300mA ~300mA Gas Valve Relay Gas Valve Relay Gas Valve Relay US076 US076 US076 Connector Arrow.58 Connector Arrow.62 Connector Arrow.63 Connector Arrow.64 3.3V 3.3V 3.3V 10mA 10mA 10mA 4mAmax 4mAmax 4mAmax Connector 1.160.68 Connector 1.160.69 Transceiver Transceiver Transceiver Connector Arrow.70 Connector Arrow.71 Connector Arrow.72 Connector Line Bi-directional.74 Bi-directional.75 Connector Arrow.77 Connector Line.78 Connector 1.160.79 Surge Protection Surge Protection Surge Protection EMI Filter EMI Filter EMI Filter ESD Protection ESD Protection ESD Protection Rectifier Rectifier Rectifier Rectifier Rectifier Rectifier Transformer Transformer Transformer LDO LDO LDO Buck Regulator Buck Regulator Buck Regulator Bi-directional.80 5V 5V 5V 16mAmax 16mAmax 16mAmax MCU MCU MCU MCU I2C I2C I2C ADC ADC ADC VDD VDD VDD UART UART UART SPI SPI SPI GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO

MCU

RX 32-Bit Performance / Efficiency MCUs

Buck Regulator

Buck Regulators (Integrated FETs)

LDO

Linear Regulators (LDO)

Transceiver

RS-485/422 with Overvoltage Protection

Wi-Fi

Low Power Wi-Fi