使用I2C总线缓冲器可以减少大型总系统中的噪声水平 AN11084
Very large I2C-bus systems and long buses
Rev. 1 ― 14 October 2011 Application note
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Keywords I2C-bus, twisted pair cables, very long buses, communication cables, Cat5e,
Cat6, Fast-mode, Fast-mode Plus, Fm+, inter-IC, SDA, SCL, P82B96,
PCA9600, PCA9605, RS-485, CAN bus
Abstract The availability of powerful I2C-bus buffers that drive their I/Os on both sides to
a nominal ground or ‘zero offset’ logic level allows the removal of noise
introduced into one section of a very large bus system. That ‘regeneration’ of
clean I2C signals enables building very long I2C buses by combining together
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