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Serial communication bus
I2C (Inter-Integrated Circuit; pronounced as "eye-squared-see" or "eye-two-see"), alternatively known as I2C and IIC, is a synchronous, multi-master/multi-slave
I2C
Microcontroller peripheral interface
I2C or UART protocol. With I2C it is possible to use a 4-pin connector. Alternatively the pins 1 to 4 can be used as simple digital I/O pins. I2C/UART/SPI:
Pmod_Interface
Human Y-chromosome DNA haplogroup
developed into several main subgroups: I2-M438*, I2a-L460, I2b-L415 and I2c-L596. The haplogroup can be found all over Europe and reaches its maximum
Haplogroup_I-M438
Serial bus specification
Carter (2024-04-01). "Working with I2C Devices: Clock Stretching". Adafruit Industries. "3.1.9 Clock Stretching". I2C-bus specification (PDF) (User Manual)
I3C_(bus)
digital, these could be Serial Peripheral Interface, SMBus/I2C or 1-Wire. In OpenBSD, many of the I2C temperature sensors from the below list have been supported
List_of_temperature_sensors
Standard for computer bootstrap code
identifying slave I2C devices like temperature sensors for hardware monitoring, whereas the alternative solution of performing a blind probe of the I2C bus, as
Open_Firmware
connector layout which includes power and three serial buses: Asynchronous, I2C, and SPI separately over 10 pins in a 2×5 layout. The connector layout was
UEXT
Software tool
GitHub Constantine A. Murenin; Raouf Boutaba (17 March 2009). "5.2. I2C bus scan through i2c_scan.c; 7.2. lm_sensors". OpenBSD Hardware Sensors Framework (PDF)
Lm_sensors
Family of integrated circuits
Stop mode includes analog comparators, watchdog timers, pulse counters, I2C links, and external interrupts. In Shutoff mode, with 20–100 nA current consumption
EFM32
Wireless communication technology
LoRa SX1278, a LoRa module Developed by Cycleo, Semtech Connector type SPI/I2C Compatible hardware SX1261, SX1262, SX1268, SX1272, SX1276, SX1278 330 kilometres
LoRa
Relationship between devices in which one controls the other
interface (SPI) bus typically has a single master controlling multiple slaves. I2C and I3C may even have multiple masters on a bus. Modbus also uses a master
Master–slave_(technology)
Standard for miniature computer expansion cards
0, I2C and DP ×4 1630, 2230, 3030 Wi-Fi, WWAN, GPS, Bluetooth, NFC B (Socket 2) 12–19 SATA, PCIe ×2, USB 2.0 and 3.0, audio, UIM, HSIC, SSIC, I2C and
M.2
Video interface protocol
I2C). The I2C master can read and write to all the slaves on the other side of the FPD-Link III chipset, which is effectively transparent to the I2C master
FPD-Link
3.0, eMMC 4.51, and SDXC Serial I/O supporting SPI, UART (serial port), I2C or PWM Type 3 SoC: DDR3L/L-RS single-channel memory controller supporting
List_of_Intel_Atom_processors
Device communications bus system
supply voltage over a single conductor. 1-Wire is similar in concept to I2C, but with lower data rates and longer range. It is typically used to communicate
1-Wire
Type of standardized secure cryptoprocessors
version 1.2 revision 116 and offered with several interfaces (LPC, SPI, and I2C), modes (FIPS 140-2 certified and standard mode), temperature grades (commercial
Trusted_Platform_Module
Type of integrated circuit
(route any function to any pin), a serial communication block (for SPI, UART, I2C), a timer/counter/PWM block and more. PSoC is used in devices as simple as
Cypress_PSoC
Devices that measure magnetic field strength using the Hall effect
2015. Retrieved 26 May 2015. "I2C Board Mount Hall Effect/Magnetic Sensors (or any other part distributor search for "I2C" and "Hall sensor")". www.mouser
Hall-effect_sensor
Collection of Unix tools in single executable file
clock. i2cdetect — Detect i2c devices. i2cdump — Dump i2c registers. i2cget — Read an i2c register. i2cset — Write an i2c register. iconv — Convert character
Toybox
Software that hides details of hardware access
joysticks. A Joystick abstraction hides details (e.g., register format, I2C address) so programmers using the abstraction do not need to understand details
Hardware_abstraction
Low-level protocol used for controlling hardware components
Yes No Platform Level Data Model Yes No NC-SI, Ethernet Yes No USB No Yes I2C/SMBus, I3C (incl. PCIe) No Yes Serial Port No Yes ACPI PCC No Yes UCIe No
Management Component Transport Protocol
Management_Component_Transport_Protocol
Standardized way to automatically access information about a memory module
intervention. The SPD EEPROM firmware is accessed using SMBus, a variant of the I2C protocol. This reduces the number of communication pins on the module to
Serial_presence_detect
Signal confirming receipt of a message without errors
Communications. 15 (3): 277–290. doi:10.1109/49.564128. "I2C Bus Specification". "Understanding the I2C Bus" (PDF). Figure 8. This article incorporates public
Acknowledgement (data networks)
Acknowledgement_(data_networks)
Series of low-cost single-board computers
Function +3.3 V power 1 2 +5 V power GPIO 2 (I²C SDA) 3 4 +5 V power GPIO 3 (I2C SCL) 5 6 Ground GPIO 4 (GPCLK) 7 8 GPIO 14 (UART TXD) Ground 9 10 GPIO 15
Raspberry_Pi
SDIO 3.01 and eMMC 5.0 Serial I/O supporting SPI, HSUART (serial port) and I2C Lacks AVX, AVX2 and older SSE4.2 instruction sets. All models support: MMX
List of Intel Celeron processors
List_of_Intel_Celeron_processors
Browser-based 3D modeling program
popular components, including the Adafruit Neopixel, Arduino Servo, and I2C display libraries. However, custom libraries cannot be selected or uploaded
Tinkercad
Series of Chinese single-board computers
jack (audio in/out) Expansion Interface 40-pin GPIO (supports GPIO, UART, I2C, SPI, I2S, PWM) Power Supply Type-C PD 20 V IN (standard 65 W) Dimensions
Orange_Pi
Video connector by Apple Computer
Reserved 25 26 Video ground/shield (R) 27 Video output (R), 75Ω 28 I2C data signal 29 I2C clock signal 30 Reserved 31 Monitor ID 32 Monitor ID 33 Vertical
HDI-45_connector
Programmable robotics kit
the older Robotics Invention System. The digital interface is capable of I2C and RS-485 communication. Lego Mindstorms NXT 2.0 is the second set in the
Lego_Mindstorms_NXT
Board for prototype electronic circuits
modulation (PWM; used in motor control), Serial Peripheral Interface (SPI), or I2C. Firmware is then developed for the MCU to test, debug, and interact with
Breadboard
Computer device that takes input from humans and gives output to humans
1/30/97. USB Implementer's Forum. 1997. Retrieved 2014-04-28. "HID over I2C". Microsoft. Retrieved 2016-01-19. "Introduction to HID over SPI - Windows
Human_interface_device
Daughter card standard specifically tailored to the needs of FPGAs
screws 2.2 mm (0.0866 inch) diameter. It is recommended to have EEPROM with I2C for identification of peripheral module with a specific address number. "SGET
CRUVI_FPGA_card
Failed USB-C alternate mode proposal
TX balanced pair for USB 3.0 data A USB RX balanced pair for USB 3.0 data I2C wire to control the USB Billboard interface, in case the cable is plugged
VirtualLink
general-purpose serial or parallel interface, such as TTL, CMOS, RS-232, SPI, I2C, etc. and generate signals with suitable voltage, current, timing and demultiplexing
Display_driver
Data transfer channel connecting parts of a computer
IEEE-488 (GPIB) IEEE-1284 (parallel port) IEEE-1394 (FireWire) UNI/O 1-Wire I2C (ACCESS.bus, PMBus, SMBus) I3C SPI D²B Parallel SCSI Profibus USB Camera
Bus_(computing)
Digital audiovisual data interface
the E-DDC implement I2C standard mode speed (100 kbit/s) and allows it to optionally implement fast mode speed (400 kbit/s). I2C address 0x74 on the DDC
HDMI
System-on-a-chip microcontroller model with Wi-Fi
ESP8266 Developer Zone Discussion Forum: Does ESP8266 actually have hardware I2C?". Espressif Systems. 2014-10-27. Retrieved 2017-10-02. Brian Benchoff (October
ESP8266
Standard for computer data connections
board area compared to USB 2.0. It is an alternative standard to SPI and I2C. USB-C (officially USB Type-C) is a standard that defines a new connector
USB
8-bit microcontroller
ATmega328PB and ATmega328PB-AUTOMOTIVE (superset of ATmega328P) - has more UART, I2C, and SPI peripherals than ATmega328P ATmega328 is commonly used in many projects
ATmega328
Software design pattern
example of where a facade is used is in register indexed values like Modbus, I2C or Special function register. In this UML class diagram, the Client class
Facade_pattern
Open-source electronics prototyping platform
Pulse Width Modulation (PWM) generation, 4 UARTs (serial communication), I2C, and SPI (Serial Peripheral Interface Bus). The Netduino family consists
Netduino
Recording device
preemptive-kernel Linux operating systems with many digital interfaces like I2C, SPI, or UART enable the direct interconnection of a digital sensor and a
Data_logger
associated with various hardware components, or can be queried through attached I2C buses. It is used by firmware (for example, OpenFirmware) to determine the
Vital_Product_Data
Human mitochondrial DNA haplogroup
10.4–14.7 I2 6.8 6.0–7.6 I2a 4.7 3.8–5.7 I2a1 3.2 2.1–4.4 I2b 1.7 0.5–2.9 I2c 4.7 3.6–5.8 I2d 3.0 1.1–4.8 I2e 3.1 1.4–4.8 I3 10.6 8.8–12.4 I3a 7.4 6.1–8
Haplogroup_I_(mtDNA)
Version history of the Linux kernel
powerpc-7.3-4 tag". lore.kernel.org. Retrieved 17 September 2026.} "[GIT PULL] i2c fixes for v7.3-rc4". lore.kernel.org. Retrieved 22 September 2026. "[git
Linux_kernel_version_history
Italian open-source hardware and software company
available through unofficial channels. The Adafruit Motor Shield V2 uses I2C, requiring vastly fewer digital I/O pins than attaching each motor directly
Arduino
Digital display interface
for miscellaneous additional data beyond video and audio, such as EDID (I2C) or CEC commands. This bidirectional data channel is required, since the
DisplayPort
Order of bytes in a computer word
byte ordering. For example, RS-232 transmits bits least significant first, I2C transmits bits most significant first, and SPI can be sent in either order
Endianness
Smartphone electronics product line
IZat Gen8B; NFC, Gigabit Ethernet, HDMI, DisplayPort, SATA, SDIO, UART, I2C, GPIOs, JTAG; USB 3.0/2.0 Snapdragon 810E (APQ8094) 20 nm (TSMC 20SoC) 4
List of Qualcomm Snapdragon systems on chips
List_of_Qualcomm_Snapdragon_systems_on_chips
Computer expansion bus standard
implements two x1 PCIe links on a high-density connector along with USB, I2C, and up to 100 points of I/O Universal IO: A variant from Super Micro Computer
PCI_Express
Device used to capture fingerprint pattern
both laptops and smartphones, the fingerprint sensor usually uses a USB or I2C interface internally. Wikimedia Commons has media related to Fingerprint
Fingerprint_scanner
Chemical compound
an organoiodine compound with the chemical formula C2I4. Its structure is I2C=CI2. It is an odourless yellow crystalline solid that is soluble in benzene
Tetraiodoethylene
Computer operating system for applications with critical timing constraints
abstracting even further a number of device drivers like External Flash, I2C devices or internal peripherals like UART commands and sleep modes. This
Real-time_operating_system
Specification for expansion and memory cards
IEEE-488 (GPIB) IEEE-1284 (parallel port) IEEE-1394 (FireWire) UNI/O 1-Wire I2C (ACCESS.bus, PMBus, SMBus) I3C SPI D²B Parallel SCSI Profibus USB Camera
ExpressCard
Hardware monitoring sensors framework
integrated with Dell's ESM, Intelligent Platform Management Interface (IPMI) and I2C, in addition to several popular Super I/O chips through lm(4). A major difference
Hw.sensors
Form factor for modules with high computing power
Pins) 1 1 1 SPI (for boot devices) 2 2 2 GP_SPI (includes 4 Chip Select Pins) 1 1 1 I2C 2 2 2 SMB 1 1 1 DC Power Input 8-20 Volt 12 Volt +/- 5% 8-20 Volt
COM-HPC
Multi-tool electronic device
debugging, and fuzz. It is able to function as a USB converter for UART, SPI, or I2C. The built-in GPIO pins connect to hardware, operate by buttons, send out
Flipper_Zero
Microprocessor family
Interface Controller channels for software-defined serial interfaces (SPI, UART, I2C, I2S) External bus unit There are "Easy Kits" for evaluation of the controller
XC2000_family
Serial port
supports one of are two widely used protocols Inter-Integrated circuit (I2C) and the Serial Peripheral Interface (SPI). Serial Peripheral Interface Bus
Synchronous_Serial_Port
One of the two chips in the core logic chipset architecture on a PC motherboard
and floppy controller). Platform power management controller, including I2C and SMBus controller. DMA controller. The 8237 DMA controller allows ISA
Southbridge_(computing)
Single-board microcontroller
ATmega328 also supports I2C and SPI communication. The Arduino software includes the Wire library to simplify use of the I2C bus. Rather than requiring
Arduino_Nano
Device to measure temperature
packaged in integrated circuits with accompanying ADC and interface such as I2C. Typically they are specified to work within about —50 to 150°C with accuracies
Thermometer
SDIO 3.01 and eMMC 5.0 Serial I/O supporting SPI, HSUART (serial port) and I2C All models support: MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, Enhanced
List of Intel Pentium processors
List_of_Intel_Pentium_processors
Synchronous serial communication interface
potentially interoperate with daisy-chained SPI include SGPIO, JTAG, and I2C. Expander configurations use SPI-controlled addressing units (e.g. binary
Serial_Peripheral_Interface
Microcontroller board
R7FA4M1AB; Docs". Renesas. Archived from the original on May 8, 2023. "Qwiic I2C Connect System". SparkFun. Archived from the original on September 7, 2023
Arduino_Uno
Small network-layer delivery protocol for cubesats
AT91SAM7A3 processors. From version 1.1 onwards, CSP also includes interfaces for I2C and RS-232. Interfaces need only to implement a function to transmit a packet
Cubesat_Space_Protocol
Component that monitors resources in a computer system
motherboards, which can either come as a separate chip, often interfaced through I2C or SMBus, or as part of a Super I/O solution, often interfaced through Low
System_monitor
Line of single-chip microprocessors from Microchip Technology
discrete I/O pins, ADC and DAC modules, and communications ports such as UART, I2C, CAN, and even USB. Low-power and high-speed variations exist for many types
PIC_microcontrollers
Human Y-chromosome DNA haplogroup
Turkey Anatolian Neolithic G2a, I2C, C1a, J2a 6500-6200 BC Barcin site, Yenişehir Valley Turkey Anatolian Neolithic G2a, I2C, C1a, J2a 5832–5667 BC Старчево
Haplogroup_H_(Y-DNA)
Standard for FPGA input/output expansion cards
address is 00. Some FMC mezzanine cards may attach other devices to the I2C bus and address them through a system controller, using the geographical
FPGA_Mezzanine_Card
Low-cost, low-power SoC microcontrollers with Bluetooth and Wi-Fi
(supports SD and SPI mode) LOLIN D32 ESP-WROOM-32 LOLIN D32 Pro ESP32-WROVER I2C port, TFT port and Micro SD Card slot (support SPI mode) Widora Air † Compact
ESP32
Smartphone with Linux-based mobile operating system
internal flash memory. Another distinctive feature of the PinePhone is the I2C connector under the back cover, which can be used for adding mods to the
PinePhone
Type of computer bus
by multiple vendors. Bus network topology EIA-485 1-Wire Open collector I2C https://www.keysight.com/blogs/en/tech/2024/02/8/how-is-10base-t1s-different-from-can
Multidrop_bus
Computer hardware
audio), as well as some instances of many digital control buses such as I2C, SPI, microWire, UART, or GPIO pins on the digital audio components. The
SLIMbus
Using software instead of dedicated hardware to process and make use of signals
serial Bit banging for Async Serial Communication Bit banging for RS-232 I2C on AVR using bit banging Efficient bit-banged SPI for 8051 microcontroller
Bit_banging
Computer system with a dedicated function
interfaces (SCI): RS-232, RS-422, RS-485, etc. Synchronous Serial Interface: I2C, SPI, SSC and ESSI (Enhanced Synchronous Serial Interface) Universal Serial
Embedded_system
Mixed-signal integrated circuit brand
In-System Programmability – can be reprogrammed up to 1000 times using the I2C serial interface. Automotive GreenPAK – allows multiple system functions
GreenPAK
Effort initiated by Shenzhen Libre Technology Co., Ltd."
with 5.x support IR Receiver U-Boot Button 40 Pin Low Speed Header (PWM, I2C, SPI, GPIO) ADC Header Power Enable/On Header The AML-S905X-CC "Le Potato"
Libre_Computer_Project
Free virtualization and emulation software
(EHCI – Host support only) Zynq UART Controller SPI and QSPI Controllers I2C Controller QEMU can emulate 64-bit "A-profile" CPUs that commonly run Linux
QEMU
Piece of read-only-memory used for booting a computer system
flashed over UART, some support USB and eventually other interfaces like e.g. I2C, SPI, or CAN. The Cortex-M core normally fetches vectors from the well-known
Boot_ROM
parameters. For many real devices, the vendors provide alternate methods such as I2C to access the full set of parameters that a specific device may support.
USB3_Vision
Microcontroller programmer and debugger
terminal to interface with a device, via such hardware protocols as SPI, I2C and 1-Wire. The Bus Pirate is capable of programming low-end microcontrollers
Bus_Pirate
Operating system
Ethereal from its ports tree prior to its 3.6 release. Added support for I2C master/slave devices Unsupported: 3.7 19 May 2005 The Wizard of OS, where
OpenBSD
Unofficial name used for Macintosh models that use Intel x86 processors
devices, although a variety of other interfaces, including USB, SMBus, and I2C, may also be used. May include Apple-exclusive Intel processors,[citation
Apple–Intel_architecture
ARM Cortex-M based Microcontrollers by STMicroelectronics
3.6 V 256 KB Flash, 64 KB SRAM General purpose timers (4), SPI/I2S (2), I2C (2), USART (2), 12-bit ADC with 10 channels (1), GPIO (20) with external
STM32
Subfamily of 8-bit AVR microcontrollers
a I2C Master" (PDF). Atmel. 2013. Archived (PDF) from the original on 14 July 2014. Retrieved 10 June 2014. "AVR312: Using the USI module as a I2C slave"
ATtiny microcontroller comparison chart
ATtiny_microcontroller_comparison_chart
Character or punctuation mark used to represent a duplicated character or word
typographic or stylistic concerns. Notable examples include the bus protocol I2C, the World Wide Web Consortium (W3C), and the fan-fiction hosting website
Iteration_mark
Intel bus for connecting CPU and I/O chipset
IEEE-488 (GPIB) IEEE-1284 (parallel port) IEEE-1394 (FireWire) UNI/O 1-Wire I2C (ACCESS.bus, PMBus, SMBus) I3C SPI D²B Parallel SCSI Profibus USB Camera
Direct_Media_Interface
(HVB) Integrated FCH featuring PCIe 3.0 USB3.0, SATA3, SD, GPIO, SPI, I2S, I2C, UART AMD in its technical documentation uses KB, which it defines as Kilobyte
List of AMD processors with 3D graphics
List_of_AMD_processors_with_3D_graphics
Computer bus standard
IEEE-488 (GPIB) IEEE-1284 (parallel port) IEEE-1394 (FireWire) UNI/O 1-Wire I2C (ACCESS.bus, PMBus, SMBus) I3C SPI D²B Parallel SCSI Profibus USB Camera
Multibus
DNA analysis of Bulgarian populations
anchor] (%) E1b1b1b (%) E1b1b1c (%) E* (%) G2a (%) H1a1a (%) I1 (%) I2a (%) I2c (%) J1 (%) J2 (%) L (%) N (%) Q (%) R1a (%) R1b (%) R2 (%) T1a (%) M217 M78
Genetic_studies_on_Bulgarians
Simple two-wire bus for motherboards
"System Management Bus (SMBus) Specification Version 3.0" (PDF). smbus.org "I2C-bus specification and user manual Rev. 7" (PDF). nxp.com "APPLICATION NOTE
System_Management_Bus
Neolithic–Eneolithic archaeological culture of southeastern Europe
G2a2b2a3, two G2a2a1a, one G2a2a1, G2a2a1a3, C1a, I2a1a2a-L161.1, I2a2a1, and I2c, while mtDNA haplogroup, two J1c2, K1a2, T2b and one H, H15a1, H40, J1c5
Cucuteni–Trypillia_culture
flexible shapes Programmable controller for custom solutions Interfaced by SPI, I2C or PS2 for easy integration to microprocessor and PC-based systems Efficient
Cirque_Corporation
Place in Östergötland, Sweden
paternal haplogroup I2a1 or various subclades of it, while the other carried I2c. With regards to mtDNA, four individuals carried subclades of U5a, while
Motala
Communication protocols
signal can be sent to or from a video graphics array (VGA) monitor with the I2C protocol using the master's serial clock and serial data pins. DDC1 is a
Display_Data_Channel
Shopping mall in New South Wales, Australia
"New Lease on Life: Reinvigorating Underperforming Retail Centres | i2C". www.i2c.com.au. Retrieved 7 August 2016. "Work begins on 120 million Marketplace
Lidcombe_Shopping_Centre
Intel chipset
System Management Bus (SMBus) is also provided, with additional support for I2C devices. Overclocking is available for unlocked variants of the supported
Intel_X99
Integrated circuits
converters), clock management, and serial communications such as USART, SPI, I2C, CAN, LIN, USB, Ethernet, and LCD, Camera or Touch controllers. Microchip
Atmel_ARM-based_processors
Computer peripheral bus; predecessor to USB
Technical/Application Notes, Hauppauge, NY (1999)" (PDF). Retrieved 2021-10-22. "I2C Bus / Access Bus". Interfacebus.com. 2000-01-01. Retrieved 2013-07-31. "What
ACCESS.bus
travel, tourism, insurance
I2C
I2C
I2C
I2C
I2C
I2C
I2C
I2C
I2C
travel, tourism, insurance