I2C bus, I2S bus, protocols, interfaces and specifications

I2C and I2S are two serial communication standards widely used inside electronic equipment to move data between integrated circuits. Although their names are similar, they serve different purposes: I2C is a general-purpose control bus for connecting chips on a circuit board, while I2S is a dedicated bus for carrying digital audio. Both were originally developed by Philips and are now found across a great many consumer and industrial devices.

The I2C bus (Inter-Integrated Circuit) uses just two wires, a serial data line (SDA) and a serial clock line (SCL), to allow many devices to communicate. Each device on the bus has an address, and a master device initiates transfers to or from addressed slave devices, so a single microcontroller can control numerous peripherals such as sensors, memory chips and real-time clocks using only two signal lines. The protocol defines start and stop conditions, acknowledgement bits and several standardised speed grades.

The I2S bus (Inter-IC Sound) is a synchronous serial interface designed specifically to carry pulse-code-modulated digital audio between chips, for example from a decoder to a digital-to-analogue converter. It typically uses separate lines for the bit clock, a word-select signal that distinguishes the left and right stereo channels, and the serial audio data itself. By separating audio data transport from device control, I2C and I2S are often used together in the same product, with I2C handling configuration and I2S streaming the audio.

Frequently asked questions

What is the I2C bus used for?: It is a two-wire control bus that lets a microcontroller communicate with many peripheral chips, such as sensors and memory, each identified by an address.
How does I2S differ from I2C?: I2S is a dedicated interface for streaming digital audio between chips, whereas I2C is a general-purpose bus for control and configuration of devices.
How many wires does I2C require?: It uses two signal lines: a serial data line (SDA) and a serial clock line (SCL), shared by all devices on the bus.

I2C - I2S bus systems

I2C protocol

Bi-directional level shifter for I²C-bus and other systems pdf file

Bidirectional level shifter circuit in I2C-bus design pdf file

Communicating with the I 2 C Bus Using the PIC16C5X

Comparing the I2C Bus to the SMBus the I²C bus and the SMBus are popular 2-wire buses that are essentially compatible with each other. Normally devices, both masters and slaves, are freely interchangeable between both buses. Both buses feature addressable slaves

I2C Bus Only two bus lines are required; a serial data line (SDA) and a serial clock line (SCL), Each device connected to the bus is software addressable by a unique address and simple master/ slave relationships exist at all times; masters can operate as master-transmitters or as
master-receivers, It’s a true multi-master bus including collision detection and arbitration to prevent data corruption if two or more masters
simultaneously initiate data transfer, pdf file

I2C Bus serial data line (SDA), serial clock line (SCL), Data Transfer - SDA, Synchronization on SCL, Frame Formats, pdf file

I2C Bus and how to use it pdf file

I2C Bus Hardware Structure the BUS physically consists of 2 active wires and a ground connection. The active wires, SDA en SCL, are both bidirectional . Where SDA is the serial dAta line and SCL is the serial cLock line

I2C bus specificatie pdf file, in Dutch

I2C bus primer the hardware setup of an I2C bus, the requirements for proper operation of the I2C bus, how to find the cause for problems and how to solve them

I2C bus protocol the I2C bus physically consists of 2 active wires and a ground connection. The active wires, called SDA and SCL, are both bi-directional. SDA is the Serial DAta line, and SCL is the Serial CLock line

I2C bus protocol in Dutch, doc file

I2C bus specification I2C bus specification, pdf file

I2C bus specification 2 I2C bus specification, pdf file

I2C-info I2C (Inter-Integrated Circuit) Bus Technical Overview and Frequently Asked Questions. All I2C-bus compatible devices incorporate an on-chip interface which allows them to communicate directly with each other via the I2C-bus, I2C interfaces

I2C Manual The I2C Manual provides a broad overview of the various serial buses, why the I2C bus should be considered, technical detail of the I2C bus and how it works, previous limitations/solutions, comparison to the SMBus, Intelligent Platform Management Interface implementations, review of the different I2C devices that are available and patent/royalty information, pdf file

I2C protocol I²C protocol is level-sensitive. The data must be stable when SCL is high. Except for two situations, the state of the SDA line can only change when SCL is low

I2C protocols I2C is an abbreviation of Inter-IC, the I2C Bus is a 2-way, 2-line means of communication between different IC's or modules. The two lines that embody the I2C Bus are the serial data line (SDA) and the serial clock line (SCL), the bus obviously being optimised for hardware simplicity, ppt file

I2C software drivers

I2C tutorial I2C tutorial, I2C bus specifications, pdf file

LM27964 White LED Driver System with I2C Compatible Brightness Control

PCF8574 expander for I2C-bus pdf file

PCF8584 parallel bus to I²C-bus protocol converter and interface

Protocole série I2C en Français

Serial and printer interface for the FX-602P calculator

Using the I2C Bus The physical I2C bus, just two wires, called SCL and SDA. SCL is the clock line, ...

I2S bus protocol

I2S application Atmel microcomputer, pdf file

I2S bus Interfacing I2S-Compatible Audio Devices To The ADSP-21065L Serial Ports, I2S bus protocol application note, I2S bus specification, pdf file

I2S bus I2S (Inter-IC Sound) is a serial bus (path) design for digital audio devices and technologies such as compact disc CD players, digital sound processors, and digital TV (DTV) sound

I2S Integrated Information System

I2S white paper pdf file

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