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Smart Thermostat

Overview

The demand for simple smart thermostat platforms is growing due to the rise of IoT-enabled HVAC systems. This system implements standard features of household thermostats while adding IoT capabilities for remote monitoring of HVAC systems and room conditions. These enhancements have led to increased adoption in both residential and industrial spaces.

System Benefits:

  • The MCU with sigma-delta ADC enables energy measurement.
  • Dual bank flash supports on-the-go software updates.
  • Certified ultra-low power Wi-Fi module for smart connectivity simplifies design and accelerates time to market.
  • MCU evaluation board with QuickConnect IoT Pmod™ boards facilitates rapid prototyping.

Block Diagram

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4:3 ratioSheet.1Sheet.2Sheet.3Sheet.4AS065AS065AS065FlybackFlybackFlybackLDOLDOLDOTemperature & Humidity SensorTemperature & Humidity SensorTemperature & Humidity SensorWi-FiWi-FiWi-FiRS-485 TransceiversRS-485 TransceiversRS-485 TransceiversMotion SensorMotion SensorMotion SensorLCD DisplayLCD DisplayLCD DisplayAC Current SensorAC Current SensorAC Current SensorBattery Li-ion.154Sheet.25Sheet.26Sheet.27Sheet.28Sheet.29Sheet.30Sheet.31Ground (earth)Sheet.39Sheet.40Sheet.41Sheet.42AC Power SourceSheet.45Alternating CurrentSheet.47Sheet.48Sheet.50Sheet.51Sheet.52Sheet.53Sheet.54Sheet.55Connector 1.158Connector 1.158.57Sheet.58Sheet.59PhasePhasePhase NeutralNeutralNeutralAC SupplyAC SupplyAC SupplySheet.6312V12V12VSheet.67Sheet.68Sheet.69Sheet.70Sheet.71Connector 1.158.72Sheet.73Sheet.74Connector 1.75Sheet.76Sheet.77Sheet.783.3V3.3V3.3VSheet.80 3.3V3.3V3.3V 2 222Sheet.84 3.3V3.3V3.3V 3.3V3.3V3.3V 2 222Sheet.89 2 222Sheet.92Vertical Wire Bundle.93 222Sheet.95Sheet.96RS485RS-485RS-485Sheet.98 PhasePhasePhase NeutralNeutralNeutralMCUMCUMCUMCU24bit DSAD24bit DSAD24bit DSADVDDVDDVDDI2CI2CI2CUARTUARTUART UARTUARTUARTI2CI2CI2CLCDCLCDCLCDCRTCRTCRTC

Flyback

Flyback & Forward Controllers

LDO

Linear Regulators (LDO)

MCU

RA Arm Cortex-M MCUs
RA Arm Cortex-M MCUs

Wi-Fi

Wi-Fi MCUs
Wi-Fi MCUs

RS-485 Transceivers

RS-485/422 with Enhanced ESD Protection

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