Electronics > Projects, Designs, and Technical Stuff
Si Labs SI7051 temperature sensor looks interesting
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mmagin:
So I was thinking of building my own thing to log temperatures from multiple sensors, and being that I don't have much of a way to calibrate them, I was thinking I wanted something with reasonable accuracy already.

So this is an I2C temperature sensor which comes from the factory accurate to +/- 0.1C, and it's $2 at digikey.  Tiny 6-DFN package.

(Edit, link: https://www.silabs.com/Support%20Documents/TechnicalDocs/Si7050-1-3-4-5-A20.pdf )

Any caveats or reasons I should be more skeptical of this?
DTJ:
That's an interesting part. I couldn't see any graphs of the temp accuracy v measured temp.


The 0.1°C accuracy is over a very narrow range.

Data sheet p7:

--- Quote ---±0.1 °C: +35.8 °C to 41 °C;
±0.13 °C: 20.0 °C to 70.0 °C;
±0.25 °C: –40 °C to +125 °C

--- End quote ---

Looks like its aimed at medical thermometers.
http://www.silabs.com/Support%20Documents/TechnicalDocs/AN1026-Si70xx-Temp-Sensor-Designers-Guide.pdf
I wonder what it's like over the range say -10°C to 60°C.


Check out the TSYS01 its +/-0.1 over a wider range but costs 3x more.
mmagin:
Ooh, good catch.  That'll teach me to read the footnotes more carefully!
Asim:
I used SI7021 temperature & humidity sensor in a pcb I designed. i liked it to the point where it is my go to sensor
beeryt:
Found this sensor as well and thinking of using it. Extrapolating from the ranges provided the -10°C to 60°C should be between ±0.13°C and ±0.25°C.

I'm not sure if I'm nimble enough to solder the 6-DFN package though. Especially given the sensitivity of the sensor and the strong recommendation to reflow.
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