Connecting I2C devices

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h-g-t
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Connecting I2C devices

Post by h-g-t »

I have seen several circuits showing I2C devices only needing two input wires.

Surely there also has to be a common earth wire between the sending and receiving devices?

Or does the design assume both devices are using a common power supply?
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mattallen37
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Re: Connecting I2C devices

Post by mattallen37 »

They do need a common reference voltage, and ground works very well (so yes, common ground is almost a requirement). A common supply is not necessary, but often easiest to design.
Matt
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h-g-t
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Joined: 07 Jan 2011, 08:59
Location: Albania

Re: Connecting I2C devices

Post by h-g-t »

Ok,

Thanks.
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