1-Wire

1-Wire is a <a href="/facts/Wired_communication/fPXbWAMU">wired</a> <a href="/facts/Half_duplex/LCULeVxr">half-duplex</a> <a href="/facts/Serial_communication/r5xP7P1c">serial</a> <a href="/facts/Bus_(computing)/R45TKwS7">bus</a> designed by <a href="/facts/Dallas_Semiconductor/5ct6Lr9P">Dallas Semiconductor</a> that provides low-speed (16.3 kbit/s) <a href="/facts/Data_communication/1yAhaANd">data communication</a> and <a href="/facts/IC_power-supply_pin/moPAAjnl">supply voltage</a> over a single <a href="/facts/Electrical_conductor/BSuyupLP">conductor</a>.
1-Wire is similar in concept to <a href="/facts/I2C/dKBBhs4U">I2C</a>, but with lower data rates and longer range. It is typically used to communicate with small inexpensive <a href="/facts/Electronic_component/F3NBVv4Q">devices</a> such as digital <a href="/facts/Thermometer/almVTBxI">thermometers</a> and weather instruments. A network of 1-Wire devices with an associated <a href="/facts/Master%2fslave_(technology)/8APze020">master</a> device is called a MicroLAN. The protocol is also used in small electronic keys known as a Dallas key or iButton.
One distinctive feature of the bus is the possibility of using only two conductors — data and ground. To accomplish this, 1-Wire devices integrate a small <a href="/facts/Capacitor/hyowqv7n">capacitor</a> (~800 <a href="/facts/Farad/gPAYcVoE">pF</a>) to store charge, which powers the device during periods when the data line is active.

1-Wire open-in-new

1-Wire