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Wi-Fi-Connected Furnace Controller

Overview

Description

A furnace is a crucial piece of equipment in any home or building, as it heats air and distributes it via ductwork to maintain the desired temperature in a given space. As more households adopt smart home ecosystems, there is a growing demand for connected appliances—such as HVAC systems—that can be remotely controlled and monitored through smart devices. This enables energy efficiency and enhances the user experience by allowing heating schedules to be optimized and customized to individual preferences and use cases.

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 residential 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:

  • Highly integrated 32-bit MCU with 12-bit A/D conversion for improved precision and compact control.
  • Power and signal isolation enhances system safety and reliability, reduces electrical noise, and improves RS-485 signal integrity and noise immunity while enabling flexible power domains between communication and control logic.

Comparison

Applications

Block Diagram

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US076: WEB Connector Arrow.244 Bi-directional.170 Connector Arrow.184 Connector Arrow.188 Connector Arrow.192 Circle.251 Circle.247 Sheet.232 Dotted Line Dotted Line.231 Line Arrow.220 Surge Protection Surge Protection Surge Protection Plug Sheet.12 Sheet.13 Sheet.14 Sheet.15 Line Connector Arrow Connector Line Transformer Line.841 Inductor Air Core.509 Sheet.23 Sheet.24 Sheet.25 Sheet.26 Sheet.27 Sheet.28 Sheet.29 Sheet.30 Sheet.31 Line.29 Inductor Air Core.212 Sheet.34 Sheet.35 Sheet.36 Sheet.37 Sheet.38 Sheet.39 Sheet.40 Sheet.41 Sheet.42 Connector Line.85 Connector Line.86 Connector Line.89 Sheet.130 Circle.126 Circle.127 Sheet.134 Bridge Rectifier.189 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 Circle Circle.84 Circle.87 Circle.88 Ground Sheet.94 Sheet.95 Connector Line.96 Sheet.135 Bridge Rectifier.101 Sheet.102 Sheet.103 Sheet.104 Sheet.105 Sheet.106 Sheet.107 Sheet.108 Sheet.109 Sheet.110 Sheet.111 Sheet.112 Sheet.113 Sheet.114 Sheet.115 Sheet.116 Sheet.117 Circle.118 Circle.119 Circle.120 Circle.121 Ground.122 Sheet.123 Sheet.124 Connector Line.125 Connector Line.136 Connector Line.137 Connector Line.139 Line.140 Line.141 EMI Filter EMI Filter EMI Filter Connector Arrow.151 Wi-Fi Wi-Fi Wi-Fi Wi-Fi Line Arrow Connector Arrow.181 Igniter Igniter Igniter Draft Inducer & Blower Fan Motor System Draft Inducer & Blower Fan Motor System Draft Inducer & Blower Fan Motor System Gas Valve Relay Gas Valve Relay Gas Valve Relay Connector Arrow.195 Connector Arrow.198 Connector Arrow.201 Connector Arrow.204 Bi-directional.207 Line Arrow.210 US076 US076 US076 Line Arrow.219 Connector Arrow.223 Connector Arrow.224 Connector Arrow.163 Sheet.229 DB9 Connector Rectangle Trapezoid Sheet.64 Circle.163 Circle.164 Sheet.67 Sheet.68 Circle.164 Circle.173 Circle.174 Circle.175 Circle.176 Sheet.74 Circle.173 Circle.174 Circle.175 Circle.176 RS-485 Bus RS-485 Bus RS-485 Bus 5V 5V 5V 3.3V 3.3V 3.3V Connector 1.160 Circle Circle.162 Circle.221 Circle.222 Connector Arrow.245 Connected signals arrow.249 Connector Arrow.252 Connected signals arrow Line Arrow.254 Connector 1.160.255 Safety Limit Switch Safety Limit Switch Safety Limit Switch SPST NO Switch Sheet.174 Sheet.175 Sheet.176 Sheet.177 Sheet.178 Sheet.179 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 Gas Sensor Gas Sensor Gas Sensor CO Sensor CO Sensor CO Sensor Photocoupler Photocoupler Photocoupler Photocoupler Photocoupler Photocoupler Photocoupler Photocoupler Photocoupler LDO LDO LDO Buck Regulator Buck Regulator Buck Regulator RS-485 Transceiver RS-485 Transceiver RS-485 Transceiver 24VAC 24VAC 24VAC Sheet.256 MCU MCU MCU UART UART UART VDD VDD VDD SPI SPI SPI GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO GPIO ADC ADC ADC
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