I2C

I²C, also known as I2C or IIC (Inter-Integrated Circuit), is a communication protocol widely used to link microcontrollers with devices like sensors, displays, and other integrated circuits. This protocol is also called the Two-Wire Interface (TWI).

  • Two Wires: Only 2 lines, SDA (Serial Data) and SCL (Serial Clock), are used to transfer data.

    • The SDA line is used by both the master and slave to send and receive data
    • The SCL line carries the clock signal

  • Multi-Device Support: I2C allows multiple slave devices to be connected to a single master, and it also supports multiple masters.

  • The master is responsible for generating the clock and controlling the transfer of data, while the slave responds by either transmitting or receiving data from the master.

RP2350's I2C

The RP2350 has 2 identical I2C controllers, each connected to specific GPIO pins on the Raspberry Pi Pico.

I2C ControllerGPIO Pins
I2C0 – SDAGP0, GP4, GP8, GP12, GP16, GP20
I2C0 – SCLGP1, GP5, GP9, GP13, GP17, GP21
I2C1 – SDAGP2, GP6, GP10, GP14, GP18, GP26
I2C1 – SCLGP3, GP7, GP11, GP15, GP19, GP27

pico2

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