The image shows a simplified equivalent circuit diagram for an I2C connection between two devices (master or slave). It shows all factors which are relevant for I2C.
| VCC | I2C supply voltage, typically ranging from 1.2 V to 5.5 V |
| GND | Common ground |
| SDA | Serial data (I2C data line) |
| SCL | Serial clock (I2C clock line) |
| Rp | Pull-up resistance (a.k.a. I2C termination) |
| Rs | Serial resistance |
| Cp | Wire capacitance |
| Cc | Cross channel capacitance |