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how many devices can be connected in i2c practically

Prakash Balagangatharan
Expert 2440 points

Hi all,

Recently I had gone through the the links given below for i2c

http://i2c.info/i2c-bus-specification; http://www.edaboard.com/thread197573.html; In that they are mentioning only 114 devices can be communicated practically in i2c but no reason. As far as my understanding the number of devices can be connected to single i2c bus is depends on the capacitance of the bus and distance. Could anyone have more idea about it?

Thanks in advance

  • 0
    Guru 325130 points

    114 is the theoretical limit for 7-bit addresses.

    How much you are limited by the capacitance depends on how the chips and the overall system are constructed. It is not really possible to predict this for an unknown system; you have to look at the signals with an oscilloscope.

    To make a bus with high capacitance work, you can use stronger pull-up resistors (which increases power usage), and/or reduce the frequency.

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