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Comparison of the DS18B20 and DS18S20 1-Wire digital thermometers

Posted: 11 Aug 2009     Print Version  Bookmark and Share

Keywords:DS18B20 DS18S20  thermometer digital 

The DS18B20 and DS18S20 1-Wire devices are both popular and excellent choices for any application requiring digital thermometers. Both devices offer the same resolution and accuracy. The two parts differ only in how the data is presented to the user. This application note describes how the devices work and the differences between them. Applications for each device are recommended.

The DS18B20 and DS18S20 both use the same base design. Temperature measurements are made using two bandgap-generated voltage sources. One of the voltage sources has a high-temperature coefficient and changes deterministically across temperature. The other voltage source has a low-temperature coefficient and does not change across temperature. An ADC converts the difference between these two voltages to a digital value, representing the temperature of the device. The resolution of the temperature conversion can be selected from 9bits to 12bits.

View the PDF document for more information.

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