Hearables body temperature monitor flex PCB strip reference design


Design files


This reference design demonstrates how to use the TMP117 to measure accurate body temperature through the ear from a hearable design. This design implements two TMP117 parts on a small flexible that is suitable for hearable devices. Two temperature sensors are integrated onto the design to compensate for system or ambient temperature changes that can affect the accuracy of body temperature measurements.

  • TMP117: ±0.1°C max, 3.5 μA ultra-low power temperature sensor
  • Integrated speaker soldering pads & audio input connection
  • Thin-Film flexible material
  • Breakout for connection to external microcontroller
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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.


Reference design overview and verified performance test data

TIDM743.PDF (108 K)

Detailed schematic diagram for design layout and components

TIDM744.PDF (88 K)

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

TIDM745.PDF (92 K)

Detailed overview of design layout for component placement

TIDM747.ZIP (243 K)

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

TIDCFY3.ZIP (2418 K)

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

TIDM746.PDF (243 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Digital temperature sensors

TMP1170.1°C digital temperature sensor, 48-bit EEPROM, PT100/PT1000 RTD replacement

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide Hearables Body Temperature Monitor Flex PCB Strip Reference Design (Rev. A) PDF | HTML Mar. 08, 2021

Related design resources

Hardware development

TMP117EVM TMP117 digital temperature sensor evaluation module

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