Smart Thermostat Localized Heat Compensation for Ambient Temperature Sensing Reference Design
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Key Document


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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TI Devices (4)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADS7142  12-bit 140-kSPS 2-ch nanopower SAR ADC with 1.8-V operation in 1.5-mm x 2-mm QFN package  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
INA230  28V, 16-bit, i2c output current/voltage/power monitor w/alert  Current sense amplifiers  Sample & Buy View Design Kits & Evaluation Modules
LMT84  1.5V-Capable, 10 uA Analog Output Temperature Sensor in SC70 and TO-92  Temperature sensors  Sample & Buy View Design Kits & Evaluation Modules
TMP235  ±1.2°C 2.3V to 5.5V analog output temperature sensor with 10 mV/C gain  Temperature sensors  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ADS7142 Download Download
INA230 Download Download
LMT84 Download
Download Download
TMP235 Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 2593 02 Feb 2018
Design files (6)
Title Type Size (KB) Date
ZIP 1379 02 Feb 2018
ZIP 24227 02 Feb 2018
PDF 915 02 Feb 2018
PDF 122 02 Feb 2018
PDF 32 02 Feb 2018
PDF 755 02 Feb 2018
More literature (1)
Title Type Size (KB) Date
ZIP 2056 02 Feb 2018
Related Tools & Software

Hardware development (1)

Name Part Number Tool Type
SimpleLink™ Wi-Fi® CC3220S Wireless Microcontroller LaunchPad™ Development Kit  CC3220S-LAUNCHXL  Development kit 

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