1-Wire

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1-Wire

A half-duplex serial bus from Maxim Integrated Products, Sunnyvale, CA (www.maximintegrated.com). It was originally developed by Dallas Semiconductor, which was acquired by Maxim in 2001. Using one line for data and power, plus ground, 1-Wire is widely used to transfer identification and calibration data from products such as battery packs, printer cartridges, medical sensors, printed circuit boards and cellphone accessories. Transmitting at 16 or 142 Kbps, each 1-Wire device has a unique serial number.

iButtons Use 1-Wire
1-Wire is used to transfer data from Maxim's iButton chips, which are portable tokens used for building access, asset management and other tracking and monitoring applications (see iButton).
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The MAX31850/MAX31851 are the industry's first solution to integrate a discrete analog-to-digital converter (ADC), a highly accurate reference, a temperature sensor for cold-junction compensation, and a 1-Wire bus interface into a single chip.
The communication with the microprocessor is allowed via a 1-wire bus through which the sensor itself is supplied.
Thus multiple chips residing on a 1-Wire bus can report back to a central processor, eliminating the need for separate wiring for each temperature sensor.