Revisions History of I 2C specification releases Many other bus technologies used in similar applications, such as Serial Peripheral Interface Bus (SPI), require more pins and signals to connect multiple devices. Turning on and off the power supply of system components.Ī particular strength of I 2C is the capability of a microcontroller to control a network of device chips with just two general-purpose I/O pins and software.Reading hardware monitors and diagnostic sensors, e.g.Changing sound volume in intelligent speakers.Changing backlight, contrast, hue, color balance settings etc in monitors (via Display Data Channel).Accessing real-time clocks and NVRAM chips that keep user settings.System management for PC systems via SMBus SMBus pins are allocated in both conventional PCI and PCI Express connectors.Describing connectable devices via small ROM configuration tables to enable plug and play operation, such as in serial presence detect (SPD) EEPROMs on dual in-line memory modules (DIMMs), and Extended Display Identification Data (EDID) for monitors via VGA, DVI and HDMI connectors.I 2C is appropriate for peripherals where simplicity and low manufacturing cost are more important than speed. Microchip MCP23008 8-bit I 2C I/O expander in DIP-18 package Accordingly, modern I 2C systems incorporate some policies and rules from SMBus, sometimes supporting both I 2C and SMBus, requiring only minimal reconfiguration either by commanding or output pin use.
One purpose of SMBus is to promote robustness and interoperability. System Management Bus (SMBus), defined by Intel in 1995, is a subset of I 2C, defining a stricter usage.
Several competitors, such as Siemens, NEC, Texas Instruments, STMicroelectronics, Motorola, Nordic Semiconductor and Intersil, have introduced compatible I 2C products to the market since the mid-1990s. It is widely used for attaching lower-speed peripheral ICs to processors and microcontrollers in short-distance, intra-board communication. I 2C ( Inter-Integrated Circuit, eye-squared- C), alternatively known as I2C or IIC, is a synchronous, multi-master/multi-slave (controller/target), packet switched, single-ended, serial communication bus invented in 1982 by Philips Semiconductors. Philips Semiconductor, known today as NXP SemiconductorsĠ.1, 0.4, 1.0, 3.4 or 5.0 Mbit/s depending on mode Not to be confused with I²S I3C or InterChip USB (IC-USB, HSIC, SSIC).
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