Thermostat

Products and reference designs

Thermostat

Block diagram

Overview

Whether you are designing a simple thermostat or a smart thermostat complete with intuitive human machine interface (HMI) and secure wireless connectivity, our reference designs and integrated circuits help you address complex challenges and deliver what is next in thermostat design.

Design requirements

Modern thermostat designs often require:

  • Accurate measurement of room temperature despite localized heat generation.
  • Multiple power rails and requirement of high efficiency to reduce localized heat.
  • Replace electromechanical relay with solid state relays to eliminate clicking noise.
  • Intuitive HMI design within space constraints.
  • Integrated wireless security.

Extend the capabilities of this application

Block diagram

Find products and reference designs for your system.

Smart thermostat

HVAC wire system HVAC wire system Point-of-load Point-of-load 24V AC 24V AC LCD backlight LCD backlight Status LEDs Status LEDs USB USB Backup battery Backup battery Human interface Human interface Haptics feedback Haptics feedback LCD LCD Thermistor Thermistor Energy storage Energy storage OR’ing controller OR’ing controller Battery gas gauge Battery gas gauge Battery charger Battery charger Output user interface Output user interface Backlight controller Backlight controller RGBW LED driver RGBW LEDdriver Wired interface Wired interface BACnet BACnet RS-485 RS-485 Signal input/output protection Signal input/output protection Protection Protection Protection Protection Relay system Relay system SSR FET & logic SSR FET & logic Wireless interface Wireless interface Wi-Fi radio Wi-Fi radio Sub 1-GHz or 2.4GHz radio Sub 1-GHz or 2.4GHz radio Memory Memory DDR termination DDR termination Voltage translators Voltage translators Signal isolation Signal isolation FETs FETs Optocoupler Optocoupler Digital processing Digital processing MPU/MCU MPU/MCU GPIO expander GPIO expander Input user interface Input user interface Capacitive touch Capacitive touch Haptics Haptics Touchscreen controller Touchscreen controller Ambient light sensor Ambient light sensor Op-amp Op-amp Light sensor Light sensor Crystal Crystal Clocking Clocking Real-time clock Real-timeclock Clock generator Clock generator Non-isolated DC/DC power supply Non-isolated DC/DC power supply Low-power DC/DC Low-power DC/DC LDO LDO PMIC PMIC Self-diagnostics/monitoring Self-diagnostics/monitoring Voltage supervisor Voltage supervisor Current monitor Current monitor ADC ADC Temperature Temperature Temperature sensor Temperature sensor Temp/Humidity Temp/Humidity Op-amp Op-amp ADC ADC Audio interface Audio interface Speaker amplifier Speaker amplifier ADC ADC DAC DAC Mic. pre-amp Mic.pre-amp D S P D S P Audio CODEC Audio CODEC Non-isolated AC/DC power supply Non-isolated AC/DC power supply FETs FETs Wide Vin DC/DC Wide Vin DC/DC EFuse EFuse PIR sensor PIR sensor Antenna Antenna Presence detection Presence detection mmWave sensor mmWave sensor Proximity sensor Proximity sensor ADC or comparators ADC or comparators Op-amp Op-amp

Technical documentation

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Type Title Date
Technical article How smart thermostats get their degrees PDF | HTML 31 Aug 2023
Technical article Extending 2.4 GHz without compromising performance in a connected world PDF | HTML 30 Jun 2023
White paper Smart thermostats are a cool addition to the connected home 28 Sep 2012
More literature Engineering A Smarter Building 28 Jan 2016
Technical article How smart amps are bringing high-fidelity audio into the smart home PDF | HTML 22 Jun 2023
Technical article How accurate sensing in HVAC systems improves efficiency and saves consumers money PDF | HTML 21 Aug 2023
Technical article A scalable approach to cloud computing applications for low power sensors PDF | HTML 18 Aug 2023
Technical article Automation and Gateways with Scalable Sitara Processors PDF | HTML 16 Jun 2023
Technical article Your microcontroller deserves a nap – designing “sleepy” wireless applications PDF | HTML 16 Jun 2023
Technical article Engineers do better than magicians: HMI touch through a thick glass PDF | HTML 13 Sep 2023
Technical article How to power your thermostat using solid state relays PDF | HTML 12 Sep 2023
Analog Design Journal Building a greener, more secure planet 10 Nov 2017
Technical article Being smart isn’t enough for thermostats today PDF | HTML 08 Sep 2023
Technical article Powering the smart home with a simple charger PDF | HTML 07 Jul 2023
Technical article Effortless energy savings with the tado° Smart Thermostat PDF | HTML 03 Aug 2023

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