This is a single wire temperature interface module. This is a specialized temperature sensor, in the sense, this sensor has built in ROM, a unique serial number signature, scratch pad RAM. Power for reading, writing, and performing temperature conversions can be derived from the data line itself with no need for an external power source. The transmission of data to and from the sensor follows strict communication protocols. The communication with the controllers is on a single wire. The controller which is in communication with the sensor reads the current data from the scratch pad non volatile memory and saves in the controller’s memory. The process of reading the sensor must be accomplished at regular intervals to detect the current temperature. It can measure temperatures in the range of 0 to 1000C in increments of 0.50.

Each temperature sensor contains a unique silicon serial number, multiple temperature sensors can exist on the same 1–Wire bus. This allows for placing temperature sensors in many different places. Applications where this feature is useful include HVAC environmental controls, sensing temperatures inside buildings, equipment or machinery, and in process monitoring and control.