Bluetooth-enabled high accuracy skin temperature measurement flex PCB patch reference design
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Key Document


This reference design demonstrates highly-accurate sensing of skin-temperature using the TMP117 high precision digital temperature sensor with CC2640R2F wireless MCU. This users guide provides design guidance for skin temperature measurement in medical and wearable applications along with an evaluation software and smart device application.

  • High accuracy (±0.1ºC) temperature measurement around human body temperature
  • 2.4 - GHz RF transceiver compatible with bluetooth low energy (BLE) 4.2 and 5 specifications
  • Flexible PCB design with integrated PCB antenna
  • Up to 3 years of shelf-life along with 5 days of active time
  • iOS App for device monitoring

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Schematic/Block Diagram

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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
CC2640R2F  SimpleLink™ 32-bit Arm® Cortex®-M3 Bluetooth® 5.1 Low Energy wireless MCU with 128-kB flash   Wireless connectivity  Sample & Buy View Design Kits & Evaluation Modules
TMP117  ±0.1°C accurate digital temperature sensor with integrated NV memory  Temperature sensors  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CC2640R2F Download Download
Download Download
Download -
Download Download
TMP117 Download Download
Download -

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 1818 19 May 2020
Design files (6)
Title Type Size (KB) Date
PDF 141 20 May 2020
PDF 460 20 May 2020
ZIP 495 20 May 2020
ZIP 639 20 May 2020
PDF 91 20 May 2020
PDF 119 20 May 2020
Related Tools & Software

Reference Designs (1)

Name Part Number Tool Type
Passive NFC Temperature Patch Reference Design  TIDA-00721  Reference design 

Hardware development (2)

Name Part Number Tool Type
SimpleLink™ Bluetooth® Low Energy CC2640R2 wireless MCU LaunchPad™ development kit  LAUNCHXL-CC2640R2  Development kit 
TMP117 digital temperature sensor evaluation module  TMP117EVM  Evaluation board 

Software development (1)

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