I²C - definition
I²C - definition
I²C (Inter-Integrated Circuit) is a synchronous serial communication bus designed by Philips (now NXP Semiconductors) to enable data exchange between integrated circuits over short distances. The I²C bus consists of two lines: SDA (data) and SCL (clock), which are common to all devices connected to the bus and operate in open drain mode, enabling multi-module communication and the use of multiple master and slave devices.
Communication follows an established frame protocol, which includes device addressing, transmission acknowledgement (ACK/NACK) and data transfer in both directions. Each slave device is identified by a unique address, allowing multiple systems to operate simultaneously on a single bus. Logic signals are transmitted using voltages compatible with TTL or CMOS levels, and transmission speeds can range from the standard 100 kbps to several megabits per second in fast and extended modes.
The advantage of I²C is the simplicity of implementation and the economy of signal lines, which makes this bus widely used in embedded devices, microcontrollers, sensors, EEPROMs, RTC clocks or Displays. With the ability to easily add additional components without modifying the main controller, I²C facilitates the integration and prototyping of electronic systems. However, due to the characteristic limitations of the bus - such as cable length, line capacitance and noise immunity - I²C is mainly used in systems on a single board or within a single device.
The I²C standard is open and widely adopted in industrial and consumer electronic systems. Its popularity is due to its high flexibility, compatibility with a wide range of devices and availability in almost all modern microcontrollers.
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