HDC1010: How to directly measure board copper temp with HDC1010

Hi Daniel,

Just so I understand, you are trying to sense temperature of a copper region across a HV isolation barrier? I would recommend looking at our new ISOTMP35, which an analog temp sensor designed to be placed across an isolation barrier to directly contact and measure high voltage isolated copper areas.

May I ask why you have chosen an HDC1010 for this application? Is humidity involved as well? If you are set on using HDC1010, I would recommend placing the sensor as close to the isolation barrier as possible, or like you said running a copper bit under the sensor up to the edge of the isolation barrier. If there is no high voltage and no actual isolation barrier, you could connect a copper trace between the HDC1010 and the copper area you want to sense.

A picture would be helpful for me to visualize what you are actually trying to do.

Thanks

-Alex Thompson

Daniel,

Understood. So yes you could try to run a copper trace from underneath the HDC1010 to the edge of the keep-out region near the heated pad you want to measure. If using the HDC1010 only for temp sensing, you could try to get the sensor as close as possible to the copper pad without violating whatever clearance is required. Lastly, you can try to thermally isolate the HDC1010 on the PCB (so that its reading from the direction of the pad) by placing slot cuts in your PCB on the sides not facing the pad. Air has a much lower thermal conductivity than PCB material, so by adding air gaps in your PCB around any temp sensor you can force the HDC1010 to sense in one direction. If these recommendations aren't helpful or making sense, I would provide a picture (or drawing) of your setup so I can better assist you.

Regards

-Alex

Daniel,

Yes all you can really do is place the HDC1010 as close as possible to the standoff, and use slot cuts around the HDC1010 in other areas so it isn't receiving as much thermal energy from other sources.

Thanks

-Alex Thompson