Matched Precision Temperature Sensing Reference Design for Heat Cost Allocators
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Key Document


The TIDA-00646 reference design demonstrates techniques for precision temperature sensing as required by heat cost llocators and other Internet of Things (IoT) applications. Heat cost allocators use the temperature differential between Room and Heater body to assign a share of the total cost of a central heating system among multiple users. TIDA-00646 achieves better than 0.5 degrees Celsius accuracy across a range of +20 to +85°C. The LMT70A CMOS sensors used in the design are available as matched pairs to eliminate the need for calibration during manufacturing, lowering OEM system cost. The design is compliant to the EN834 standard using the “two-sensor measurement method”.

  • Highly accurate temperature sensing across environment conditions: better than 0.5 degrees from +20 to +85degC
  • Matching of two adjacent LMT70A sensors on Tape and Reel saves test and manufacturing cost
  • CC1310 SimpleLink(TM) wireless MCU provides single-chip solution for heat measurement and RF communications
  • Low power operation down to 2.0V extends battery lifetime
  • Cost-optimized two-layer PCB layout in HCA form factor

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Schematic/Block Diagram

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Design Guide

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Design Files

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TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CC1310  SimpleLink™ 32-bit Arm Cortex-M3 Sub 1 GHz wireless MCU with 128kB Flash  SimpleLink Solutions  Sample & Buy View Design Kits & Evaluation Modules
LMT70A  ±0.1°C Matching Accuracy Precision Analog Temperature Sensor  Temperature sensors  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CC1310 Download Download
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Technical documentation

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Application notes (1)
Title Type Size (KB) Date
PDF 3596 23 Oct 2018
User guides (2)
Title Type Size (KB) Date
PDF 2968 18 Nov 2015
PDF 1731 21 Oct 2015
Design files (7)
Title Type Size (KB) Date
ZIP 587 08 Dec 2015
ZIP 986 08 Dec 2015
PDF 2218 08 Dec 2015
PDF 1150 08 Dec 2015
PDF 224 08 Dec 2015
PDF 98 08 Dec 2015
PDF 465 08 Dec 2015
More literature (1)
Title Type Size (KB) Date
ZIP 24992 08 Dec 2015
Related Tools & Software

Reference Designs (2)

Name Part Number Tool Type
Heat Cost Allocator with wM-Bus at 868 MHz Reference Design  TIDA-00838  Reference design 
Human Skin Temperature Sensing for Wearable Applications Reference Design  TIDA-00824  Reference design 

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