Inter-Integrated Circuit (I²C - I2C - IIC)

• is a synchronous and bi-directional serial communication protocol in half-duplex mode
• is a synchronous, multi-controller/multi-target, packet-switched, single-ended, serial communication bus

Specifications

• Protocol: Serial, half-duplex
• Width: 1-bit (SDA) with separate clock (SCL)
• Data signal: Open-collector or open-drain
• Number of devices: 128 devices robot-electronics.co.uk
• Designed: 1982; 41 years ago
• Bitrate: 0.1, 0.4, 1.0, 3.4, or 5.0 Mbit/s depending on the mode