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Understanding 1-wire interface

1-wire devices. DS18B20 and iButtons

1-wire devices are commonly used in many applications. You probably are familiar with the famous DS18B20 digital temperature sensor in the TO92 package. They can be powered and interfaced using the same single data line plus the ground return, of course. 1-wire originally was designed by Dallas Semiconductors Corp., which is also a major provider of 1-wire devices like temperature sensors, timers, real-time clocks, memory, and the well-known iButton. 1-wire interface is a bidirectional, half-duplex slow serial communication standard. It doesn’t use any clock signal. When talking of speed, the standard data rate is 15.4kbps. But there is possible to overdrive 1-wire communication to up to 125kbps.

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