Smart Thermostat Localized Heat Compensation for Ambient Temperature Sensing Reference Design

(ACTIVE) TIDA-01596

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Key Document

Description

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.

Features
  • 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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Schematic/Block Diagram

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Design Guide

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Design Files

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Bill of Materials (BOM)

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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 2-ch nanopower SAR ADC with 1.8V operation in 1.5mm x 2mm QFN package  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
INA230  28V, Bi-Directional, Low-/High-Side, I2C Out Current/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  Precision Analog Output Temperature Sensor  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
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TMP235 Download
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Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 2593 02 Feb 2018 0
Design files (6)
Title Abstract Type Size (KB) Date Views
ZIP 1379 02 Feb 2018 0
ZIP 24227 02 Feb 2018 0
PDF 915 02 Feb 2018 0
PDF 122 02 Feb 2018 0
PDF 32 02 Feb 2018 0
PDF 755 02 Feb 2018 0
Related Tools & Software

Design Kits & Evaluation Modules  ( 1 )

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

Software (1)



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