How the I2C Bus Works - EEWeb
How the I2C Bus Works - EEWeb
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.