Typical Setup

The image shows a simplified equivalent circuit diagram for an I2C connection between two devices (master or slave) containing all relevant factors 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

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