1-Wire protocol simple and easy
![](https://scienceprog.com/wp-content/uploads/2013/01/1wire_signals-250x150.png)
Dallas Semiconductor, owned by Maxim, developed the 1-Wire communication protocol. This protocol allows the communication of multiple chips to one host with minimal pin count. The protocol is called 1-Wire because it uses 1 wire to transfer data. The 1-Wire architecture uses a pull-up resistor to pull the data line’s voltage at the master side. 1-Wire protocol uses CMOS/TTL logic and operates at a supply voltage range of 2.8 to 6V. Master and slave can be receivers and transmitters, but only one direction at a time. LSB goes first always. Time slots transfer data in the 1-wire network. For instance, to write logic “1”, the master pulls the bus low for 15us or less. To write logic “0,” the master pulls buss low for at least 60us. The system clock is not required as each part is self-clocked and synchronized by the falling edge of the master.