CAT # DS18B20 5 out of 5 stars(1 Review) Write a Review

$ 1.50
$1.50 each
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Product Description
DS18B20 1-Wire digital temperature sensor. Reports degrees C with 9 to 12-bit precision, -55C to 125C (+/-0.5C). Each sensor has a unique 64-Bit Serial number etched into it - allows for a huge number of sensors to be used on one data bus. This is a wonderful part that is the corner stone of many data-logging and temperature control projects. TO-92 package.

· Unique 1-Wire® interface requires only one port pin for communication
· Each device has a unique 64-bit serial code stored in an onboard ROM
· Multidrop capability simplifies distributed temperature sensing applications
· Requires no external components
· Can be powered from data line. Power supply range is 3.0V to 5.5V
· Measures temperatures from -55°C to +125°C (-67°F to +257°F) ±0.5°C accuracy from -10°C to +85°C
· Thermometer resolution is user-selectable from 9 to 12 bits
· Converts temperature to 12-bit digital word in 750ms (max.)
· User-definable nonvolatile (NV) alarm settings
· Alarm search command identifies and addresses devices whose temperature is outside of programmed limits (temperature alarm condition)
· Applications include thermostatic controls, industrial systems, consumer products, thermometers, or any thermally sensitive system

For the same item on a breakout board, see CAT# TS-12.
Spec sheet available in PDF format.
WARNING: May cause cancer or reproductive harm.
California Prop. 65
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Customer Reviews 5 out of 5 stars(1 Review)

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success comes with patience... 5 out of 5 stars

Reviewer: from colorado rocky mountains, driving all over the USA

I'm using obsolete Parallax (SX-28) microcontrollers (but I assume they're all about the same)...
--- these were tricky. I kept getting no response except for the reset. Finally I set up some LED's and just observed (sampled EVERY TWO micro-seconds) so that I could see the unit's responses --- it was faster than I had ever expected: my program had been too slow. I then programmed my "sampling" right into the middle of those observed responses - and the units work really well...
--- also, they usually take another reset for a another function to be performed...
--- I could query each unit's serial number, (and write it down) so I didn't have to bother with the CRC; instead, I just ignore (try, try, again) any response that is not approximately what I was expecting.
--- "everything" is in the simple, 3-lead chip -- I do not know the benefits of the same chip mounted on a card for an extra $4.

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