Smart Thermostat Localized Heat Compensation for Ambient Temperature Sensing Reference Design


Design files


Localized thermostat heat generation is a leading cause for incorrect ambient temperature sensing near the return air plenum. This ultimately leads to overshoot in the HVAC cycle, resulting in costly energy bills. This reference design addresses this common problem associated with thermostat design. Through the use of a low-cost analog temperature sensor network located on the PCB, the internal thermostat temperature gradient can be found and effectively compensated for in order to acquire the true ambient temperature value.

  • Current and power monitoring of main power supply
  • 20Ω power resistor used for local heat generation
  • Two temperature sensor sets for determining the temperature gradient across the board
  • Low cost SAR ADC used for temperature conversion
  • Uses CC3220 Launchpad for data processing on real thermostat platforms
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUDO1.PDF (2593 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers


Detailed overview of design layout for component placement

TIDRVK6.ZIP (24227 K)

Files used for 3D models or 2D drawings of IC components

TIDCEH6.ZIP (1379 K)

Design file that contains information on physical board layer of design PCB


PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Analog temperature sensors

LMT841.5V-Capable, 10 uA Analog Output Temperature Sensor in SC70 and TO-92

Data sheet: PDF | HTML
Analog temperature sensors

TMP2351C analog temperature sensor, 10 mV/C

Data sheet: PDF | HTML
Digital power monitors

INA23036-V, 16-bit, I²C output current, voltage and power monitor with alert

Data sheet: PDF | HTML
Precision ADCs

ADS714212-bit 140-kSPS 2-ch nanopower SAR ADC with 1.8-V operation in 1.5-mm x 2-mm QFN package

Data sheet: PDF | HTML

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Technical documentation

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Type Title Date
* Design guide Smart Thermostat Localized Heat Compensation Reference Design Feb. 02, 2018

Related design resources

Hardware development

CC3220S-LAUNCHXL CC3220S LaunchPad™ development kit for Wi-Fi® SimpleLink™ wireless MCU

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