Home Forums I2C (Inter-Integrated Circuit) Forum What is the maximum bus length of the I2C bus?

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  • Shivakumar
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    Using the default pull-up values, the PDQ Board’s I2C port is capable of data transfer rates up to 100 KB per second with maximum bus loading of 170(pF). Adding parallel 3.3K resistors to the SDA and SCL lines brings the equivalent pull-up resistance down to 2K, and allows 100 KHz signaling with bus capacitance as high as 400pF. The HCS12 MCU can generate data rates up to 1 MB per second, but accurate data exchange at these high rates requires very low bus loading (say, under 40 pF with 2K pull-ups). Lowering capacitive loading to these levels is difficult, and requires short cable lengths and very few peripheral devices on the I2C bus.

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