1-Wire bus

1-Wire bus Description

The 1-Wire may exist in a number of forms; however the bus is currently defined using a linear topology, a stubbed topology, or a star topology. The 1-Wire bus will have one Master, and some number of Slaves [1-Wire devices]. Each Slave may not have stubs longer then 3 meters in the linear topology circuit, while the stubbed topology may have stub lengths greater than 3 meters, and the star topology allows the slaves to radiate from then Master with any length.
The longest wire run from a Master to a Slave is defined as 750 meters [maximum cable length].

A typical 1-Wire interface contains a Master which utilizes a 220 ohm pull-up resistor off the net and some number of Slaves connected to the net.
Slaves residing off stubs are connected to the main line via a 150 ohm resistor to reduce reflections on the line.
In addition to the 1 transmission wire, the 1-wire bus also requires a ground [return] line.

The 1-Wire protocol uses conventional CMOS/TTL logic levels with operation specified over a supply voltage range of 2.8V to 6V.
Both master and slaves are configured as transceivers permitting bit sequential data to flow in either direction, but only one direction at a time.
The data read and written over the interface is least significant bit (LSB) first.
Other IC to IC Buses.

PC motherboard

Distributor rolodex Electronic Components Electronic Equipment EDA CDROM Software Engineering Standards, BOB card Cabled Computer Bus Electronic Engineering Design Table Conversion DB9-to-DB25.
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Modified 6/14/15
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