We receive many requests for certificates of calibration of our temperature sensor products.
We calibrate and test 100% of our 1-Wire® chips against a NIST traceable standard. However, we do not offer calibration certificates for them. An independent calibration lab calibrates Maxim’s production test instruments. However, Maxim itself is not a certified calibration lab and therefore cannot offer you a formal certificate.
Maxim Integrated Products stands behind the statements in our data sheets, and our standard Terms and Conditions of sale protect you against product defects. However, you should not assume that use of our components forms the basis of NIST certification for your own equipment or systems. Such certification requires an unbroken chain of certificates from the thing being certified to the official standard at NIST.
Therefore, if your application requires certification of calibration of the temperature sensing capability, you should have your finished product certified by an accredited independent lab.
A formal, signed copy of this statement can be downloaded.
There is no stated maximum distance for connecting the DS18B20. The transmission range depends highly on the system's environment and design. Instead of specifying a distance, the part is specified by logic level and timing thresholds. As long as the system can satisfy the timing and voltage considerations, it will work fine.
The DS18B20 does not sense temperature directly through the package. For all package types, the DS18B20 senses temperature primarily through the GND pin. Ensuring a good thermal connection between the GND pin of the device and the heat source you wish to measure will provide the best results.
This plot shows characterization data over temperatures from -10°C to +85°C at different voltages:
The DS18B20 is well within ±0.5°C in this range. We do not have any characterization data from 85°C to 100°C, but based on what we've observed on the bench, we shouldn't have a problem meeting our 0.5°C specification even at 100°C. The form of the curve is always the same; the offset may shift a bit depending on calibration. But, you can always expect to see the same curved performance from every DS18B20.
We do not expect, nor have we encountered, any issues operating the DS18B20 at temperatures up to 125°C for long periods of time (hours, days, etc.). We have had no customer complaints to such an effect either. We fully expect the DS18B20 device to operate properly at temperatures up to +125°C.
We only perform mechanical vibration tests on hermetic packages and packages with crystal oscillators for timekeeping devices. The DS18B20 meets neither of those criteria so we do not have vibration data on this part.
We do not provide VHDL or Verilog 1-Wire code for any 1-Wire slave device. This is done to protect the integrity of the 1-Wire families, so that others cannot create slaves and potentially duplicate our serial numbers.
Yes, the DS18B20 does work with the DS2480B. The DS2480B is not a dummy passthrough unit for receiving data and the correct commands will need to be sent. See Application Note 192: "Using the DS2480B Serial 1-Wire Line Driver" for software examples that could be adapted to the DS18B20.
The DS18B20 can be powered from any source. Since batteries will dip in voltage, a nominal 3V battery may not always supply the minimum 3.0V the DS18B20 requires. We suggest a step-up voltage regulator is used to ensure the device is supplied within its rated voltage range of 3.0V to 5.5V.
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