What is 2 wire serial interface?
The I2C protocol also known as the two wire interface is a simple serial communication protocol that uses just two pins of a microcontroller namely SCL (serial clock) and SDA (serial data). This is a very popular protocol that can be used to address a large number of slave devices that are connected to the same bus.
What is UM10204?
UM10204. I2C-bus specification and user manual. • Serial, 8-bit oriented, bidirectional data transfers can be made at up to 100 kbit/s in the Standard-mode, up to 400 kbit/s in the Fast-mode, up to 1 Mbit/s in Fast-mode Plus, or up to 3.4 Mbit/s in the High-speed mode.
What is I2C serial interface?
I2C stands for Inter-Integrated Circuit. It is a bus interface connection protocol incorporated into devices for serial communication. Recently, it is a widely used protocol for short-distance communication. It is also known as Two Wired Interface(TWI).
How many wires are in a typical I2C interface?
I2C – Inter-Integrated Circuit communications! I2C is incredibly popular because it uses only 2 wires, and like we said, multiple devices can share those wires, making it a great way to connect tons of sensors, drivers, expanders, without using all the microcontroller pins.
What do SCL and SDA stand for?
SDA (Serial Data) – The line for the master and slave to send and receive data. SCL (Serial Clock) – The line that carries the clock signal. I2C is a serial communication protocol, so data is transferred bit by bit along a single wire (the SDA line).
What is the speed of fast mode?
The I2C fast mode defines transfer rates up to 400 kbit/s whilst the first I2C specification dated 1982 had a limit of 100 kbit/s. To accomplish 400 kbit/s the timing requirement were defined more strictly.
What is SMBus protocol?
The System Management Bus (abbreviated to SMBus or SMB) is a single-ended simple two-wire bus for the purpose of lightweight communication. It carries clock, data, and instructions and is based on Philips’ I²C serial bus protocol. Its clock frequency range is 10 kHz to 100 kHz.
What devices use I2C?
I2C Sensor Examples
- Differential Pressure Sensor (SDP611)
- IR Temperature Sensor (MLX90614)
- SHT3x Temperature and Humidity Sensor.
- Adafruit 10-DOF IMU Breakout.
- Accelerometer & Compass Module (LSM303)
- Compass (LSM303)
- Accelerometer (LSM303)
- Accelerometer (ADXL345)
How long can I2C wires be?
So the maximum bus length of an I2C link is about 1 meter at 100 Kbaud, or 10 meters at 10 Kbaud. Unshielded cable typically has much less capacitance, but should only be used within an otherwise shielded enclosure.
How do I connect two I2C devices?
When you connect two devices to each other using the I2C bus, you just need to connect the VCC pin from one device to the VCC pin from the other device, and do the same to the SDA, SCL and GND pins.