1-Wire is a device communications bus system designed by Dallas Semiconductor Corp. It provides low-speed data, signaling, and power over a single signal. 1-Wire is similar in concept to IÂ²C, but with lower data rates and longer range. It is typically used to communicate with small inexpensive devices such as digital thermometers and weather instruments. A network of 1-Wire devices with an associated master device is called a MicroLan.