I2C® Protocol Question

SN96

I have a question regarding the I²C^® protocol.

What applications are used with this? I see alot of people on this form discussing the use of this but I have to admit I don't understand what you are all saying. Can some one give me an example of how one might use this technology?

Thanks.

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Mike

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Jon Williams

I2C (inter integrated circuit) is a synchronous, addressable buss topology/protocol designed by Philips to allow chips to "talk" with each other over two wires. Simple as that. The nice thing about I2C is that it's easy to implement, and there are a lot of interesting components available.

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Jon Williams
Applications Engineer, Parallax

Guenther Daubach

As an example, take the Philips PCF8591, an 8-bit quad ADC plus a single DAC chip, allowing you access to this device via just two wires, the SCL and SDA lines. Popular members of the family of I²C devices also are the serial EEPROMs, i.e. the 24LC??? devices, and there are many more I²C chips available. Thus, such devices are ideally suited for MCUs with a limited count of I/O pins. Although 2-wire serial communication implies some speed limitation, it's speed is more than fast enough for many applications.

I'm using I²C components in most of my SX-based applications, and I'm also using this protocol for inter-SX communications with good results. I have also designed an RS-232/I²C adapter allowing you to "talk" to an I²C bus via a standard COM port.

Click here www.semiconductors.philips.com/acrobat_download/literature/9398/39340011.pdf to get more information about I²C from the "inventors".

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Greetings from Germany,

Günther