Getting Started with I2C: What is Bus Arbitration

 

I2C (Inter-Integrated Circuit) is a widely used communication protocol for embedded systems. It enables communication between different components using a synchronous serial communication mechanism. One of its key features is arbitration, which resolves conflicts that occur when two or more devices try to transmit data at the same time.

Arbitration in I2C is based on a wired-AND logic system, where devices on the bus can pull the bus lines low but not high. If two or more devices try to transmit data simultaneously, the device that pulls the bus lines low first wins the arbitration and can transmit its data. The other device backs off and waits for the next opportunity to transmit its data.

For example, if two I2C Master devices are connected to the same bus and both attempt to transmit data to the same I2C Slave, an arbitration process will occur to determine which device has priority. The device that pulls the SDA line low first will win the arbitration and proceed to transmit its data on the bus, while the other device backs off and waits for the next opportunity to transmit its data.

The I2C bus arbitration process ensures that data is transmitted without errors and that only one device has control of the bus at any given time. This is important in systems where multiple devices need to communicate with each other. The arbitration mechanism in I2C allows for efficient and reliable communication between devices on the same bus.

For more details, please refer the link shared below:

https://embeddedwala.com/Blogs/DigitalCommunication/Getting-Started-with-I2C:-What-is-Bus-Arbitration


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