Infineon I2C Read Ext Device 1 Manual page 3

Introduction
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The I2C protocol was developed to provide a simple and efficient data
transfer between multiple devices over a short distance.
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It uses a bidirectional serial bus with two wires. A serial data line (SDA)
and a serial clock line (SCL) are carrying the information between multiple
devices.
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Both lines are connected to a positive supply voltage via pull-up resistors.
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An I2C device can work as a master or as a slave. The master, which is
normally a microcontroller, initiates and terminates the transfer and
generates the clock pulse.
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A specific slave can be addressed by the master via a 7- or 10-bit
address. Afterwards the master starts the communication.
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Data can flow in either direction and can be set via a data direction bit,
which is transmitted by the master.
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