20 lines
1.3 KiB
Markdown
20 lines
1.3 KiB
Markdown
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# I²C
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The Inter-Integrated Circuit (I2C) bus is a communication protocol used to transfer data between integrated circuits on a circuit board. It was developed by Philips Semiconductors (now NXP Semiconductors) in the 1980s as a way to connect peripheral devices to a microcontroller.
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I2C uses a two-wire serial interface consisting of a clock signal `(SCL)` and a data signal `(SDA)`. Multiple devices can be connected to the same bus, with each device having a unique address. The bus is controlled by a master device, which initiates all communication with the slave devices.
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Communication on the I2C bus is initiated by the master device sending a start condition, followed by the slave address and the read/write bit. The slave device then acknowledges receipt of the address, and the master device can then send or receive data to or from the slave device.
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One advantage of the I2C bus is that it uses only two wires, making it a simple and efficient way to connect multiple devices on a circuit board. Additionally, the protocol supports multiple data transfer speeds, allowing for flexibility in device communication.
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```mermaid
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graph LR
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A(Master Device) -- SCL --> B(I2C Bus)
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A -- SDA --> B
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B -- SCL --> C(Slave Device 1)
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B -- SDA --> C
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B -- SCL --> D(Slave Device 2)
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B -- SDA --> D
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```
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