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How the I2C Bus Works - EEWeb

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Normal<br />

I 2 C<br />

P82B715<br />

I 2 C <strong>Bus</strong> Extender<br />

I 2 C <strong>Bus</strong> Extenders<br />

Normal<br />

I 2 C with<br />

stronger<br />

outputs<br />

for long<br />

distance<br />

buses<br />

Dual Bi-Directional <strong>Bus</strong> Buffer<br />

Semiconductors 75<br />

P82B96<br />

Normal<br />

I 2 C with<br />

V OL<br />

offset<br />

KEY POINTS<br />

• High drive outputs are used to extend <strong>the</strong> reach of <strong>the</strong> <strong>I2C</strong> bus and<br />

exceed <strong>the</strong> 400 pF/system limit. Can be used in 400 kHz systems.<br />

• Possible distances range from 50 meters at 85 kHz to 1km at 31 kHz<br />

over twisted-pair phone cable.<br />

• P82B96 has split high drive outputs allowing differential transmission<br />

or Opto-isolation of <strong>the</strong> <strong>I2C</strong> <strong>Bus</strong>.<br />

• The 715 doesn’t isolate capacitance beyond 3000 pF but doesn’t use<br />

offset VOL like <strong>the</strong> 96 so it is better for VOL sensitive applications.<br />

• See Application Note AN255 for more details.

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