Roberto Hernandez wrote:
>
> hi all:
>
> any  body know if..
> is really necesary put 2 resistor in the i2c bus to communicate with serial devices if the controller
> already has it (i.e. enable pull ups on portb) ...?
> anyone can help me...
> thanks

From memory, I think I2C data lines are pulled up with only a few K
ohms. The pullups are much higher in resistance and may not be 'stiff'
enough for reliable data transfer.

--
Best regards

Tony

mICros
http://www.bubblesoftonline.com
mailto:sales@bubblesoftonline.com

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