10
Interfacing with 1-Wire Devices
1-Wire is a bus standard designed to serve a similar purpose to the I2C bus (see Chapter 9)—that is, to allow microcontrollers to communicate with peripheral ICs with a minimal number of data lines. The 1-Wire standard created by Dallas Semiconductor has taken this to its logical extreme by reducing the data lines used to just one. The bus is slower than I2C, and it has the interesting feature of parasitic power, which allows remote devices to be connected to a microcontroller with just two wires, GND (ground), and combined power and data wire.
The 1-Wire bus standard has a much smaller range of potential devices than I2C, most manufactured by Dallas Semiconductor or Maxim. They include printer cartridge identity ...
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