I2C
===

###### tags: `ASIC`

[TOC]

# I2C Pin

- Serial Data Line (SDA)
- Serial Clock Line (SCL)


# I2C bit rate
- 100 Kbit/s (Standard-mode)
- 400 Kbit/s (Fast-mode)
- 1 Mbit/s (Fast-mode Plus)
- 3.4 Mbit/s (High-speed mode)
- 5 Mbit/s (Ultra High-speed mode)

# I2C Feature

- START and STOP conditions
- START(S) condition: SDA 10 transition , SCL=1
- STOP(P) condition: SDA 01 transition , SCL=1

- Data validity (data latch)
- When SCL = 1, SDA = valid data
- Data changes during low clocks

- Data transfer
- Data bits are transferred after start condition
- Most significant bit (MSB) first
- Address format
- 7-bit for slave ID and 1-bit for read(1)/write(0) bit
- ACK(0) and NACK(1)


# I2C protocol

- Master transmit

- Master receive

- Repeat Start

- High Speed mode
- Master code
- To identify different I2C masters on the same bus

# Waveform


Reference
===

[成大Wiki, I2C: Inter-Integrated Circuit](https://goo.gl/HyTZpT)