“One Wire” refers to a communication protocol developed by Dallas Semiconductor (now Maxim Integrated) that allows multiple devices to communicate over a singleWire using a master-slave architecture. It enables bidirectional communication and power delivery over a singleWire, simplifying wiring and reducing hardware complexity in certain applications.

The protocol operates by sending and receiving data serially using a singleWire, which also serves as a ground reference. Each device on the One Wire network has a unique 64-bit address, allowing the master device to identify and communicate with individual slaves. Additionally, One Wire devices can be powered directly from the data line, eliminating the need for separate power connections in some cases.

One Wire is commonly used in applications where minimizing wiring and hardware complexity is essential, such as temperature sensing, identification (e.g., RFID tags), and small-scale data logging. It’s particularly popular in applications where running multiple wires is impractical or cost-prohibitive, such as in distributed sensor networks or in situations where space is limited.

Overall, One Wire offers a simple and cost-effective solution for connecting multiple devices over a single wire, making it a valuable tool in various embedded systems and IoT applications.

• Above image link
• This protocol is serial communication protocol
• Its developed by Dallas Semiconductor.

Data Frame

Reset    | Presense pulse    | Read ROM | Device/Family ID    | Serial Number| CRC

CRC Explanation

The most commonly used polynomial lengths are:

• 9 bits (CRC-8)
• 17 bits (CRC-16)
• 33 bits (CRC-32)
• 65 bits (CRC-64)

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Reference :

• Data Sheet : https://datasheets.maximintegrated.com/en/ds/DS18B20.pdf
• http://www.jon00.me.uk/onewireintro.shtml
• https://en.wikipedia.org/wiki/Cyclic_redundancy_check
• https://www.geeksforgeeks.org/modulo-2-binary-division/

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