• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 2 answers
  • Subscribers 32 subscribers
  • Views 185 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Original question:

TMP117: linux driver for TMP117

TMP117: The thermal conductivity between TMP117 and the steel plate

Lumina Gui
Genius 4000 points

Part Number: TMP117

Dear TI Engineer,

 

One of our smartwatch project is using the TMP117MAIDRVR to monitor the human temperature, and the electrode pads in contact with human skin are made of steel. We would like to confirm the thermal conductivity between the steel pads and TMP117. Can you help to confirm it?

 

Thanks,

Kind Regards

  • 0
    TI__Genius 11350 points

    Hello Lumina,

    Steel is a great choice for what I'm assuming is a metal capsulation touching the skin. The key is enhancing the thermal conductivity between the sensor and the steal metal. I have attached a reference design highlighting a good practice for measuring skin temperature sensor. I can confirm best layout conditions with schematic and PCB layout review.

    tiduay7.pdf

    Best Regards,

    Meredith McKean

  • 0 in reply to Meredith McKean
    Genius 4000 points

    Dear Meredith,

    Our structural design is as follows:

    So we want to confirm the thermal conductivity requirements for the thermal grease filling between TMP117 and steel metal (or possibly copper).

    Thanks,

    Kind Regards

  • 0 in reply to Lumina Gui
    TI__Genius 11350 points

    Hello Lumina,

    I cannot confirm overall performance of the system. I can confirm that using thermal grease is a good practice. Using thermal grease as shown in the diagram, is a good practice to increase thermal conductivity between the sensor and the metal. 

    Best Regards,

    Meredith McKean