Subsections

1.2 Hardware

1.2.1 The 1-Wire Standard

The 1-Wire ® resp. One-Wire bus from Maxim (Maxim/Dallas) describes a serial interface that uses just one data wire and is used both as a power supply and as a transmit and receive line. However, a return (GND) is required. Every 1-Wire chip has a unique ID number by which it can be addressed. So several 1-Wire devices can be connected on a single bus.

1.2.2 The 1-Wire-Components

Maxim offers a variety of 1-Wire-Components: Serial-, USB-, I2C-adapters, thermometers, switches(up to 8 channels), EEPROMs, Clocks, A/D-converters, digital potentiometer. You really get everything you need for home automation. An overview of the major components can be found in the appendix under A.2. You may also connect iButton ® parts (NV-RAM, EPROM, EEPROM, Temperature, Humidity, RTC, SHA, Logger).

1.2.3 The 1-Wire-Bus

The 1-wire-bus in principle consists of two twisted lines, in accordance with corresponding topologies longer distances up to 150 m should not be a problem. Cat5 twisted pair Ethernet cable is often used for the wiring. For the assignment of the individual cores, different approaches exist. Maxim uses 6-pin modular jacks and plugs (RJ-11) and has created its own standard, but this does not fit the 8-pin RJ-45 plug stuff. Further standards are described in the appendix (chapter A.1). You will also find informations on the topology of the bus at Maxim, their website offers everything you need to deal with 1-wire.

© 2001-2015 The fli4l-Team - 27 January 2015