• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 30 subscribers
  • Views 194 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

TMP275: Isolated (from GND) Temperature Sensor Recommendation

RICK SIMON
Prodigy 150 points
Part Number: TMP275

I need a temperature sensor recommendation with the following key specification:

3.3V Powered

I2C Interface with at least four addresses

-10 to 85°C range (min)

Isolated from ground sensing.

The last requirement is important and I originally picked the TMP275.  It meets all of my requirements but it says to mount it on a PCB and use the copper pad connect to the end pin of the TMP275 as the main contact for sensing temperature.  The problem is that I want to sense temperature on a metal object that I don't want to connect to GND.  Does anyone have a better part suggestion for this application?  Thanks.

  • 0
    TI__Expert 6830 points

    Hi Rick,

    Thanks for posting to the Sensors forum.

    I believe you are referring to the ground plane shown in section 10.2 of the TMP275 datasheet:

    The ground plane for thermal coupling to the heat source is suggested to ensure that the measured temperature from the sensor is as close as possible to the actual temperature of the heat source, but the ground plane to the heat source isn't strictly necessary.

    You can still use the TMP275 to measure the temperature of the metal object without the ground plane to it, you'll just have slightly more thermal resistance than you would with the plane. Make sure the TMP275 is placed as close as possible to the heat source.

    Best regards,

    Jesse