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Need for Pull Up in I2c

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vinothmct

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Why do we need pullup resisitors in I2c . What is the work done by Pull up?
 

The I2C line drivers are open drain/open collector so they can only ground the lines or leave them floating.
The pull up resistor forces a positive state when the lines are not pulled low by the line drivers.
 

alexan_e is right. I2C lines are open collector. they can provide only ground level. to provide +ve bias, we must connect external pull up.
 

**broken link removed**

Plz refer it, i hope it's useful to u...
 

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