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Topic: Multiplexing switch inputs with an i2c ic? (Read 407 times) previous topic - next topic


I'm not shure if something like that exist, I didn't find anything, maybe I'm looking in the wrong direction.

Is there some kind of IC that's capable of "sensing" a group of digital inputs (like a bunch of switch buttons) and provide their status on an i2c channel (e.g. a microcontroller asking for it on the i2c wire)?

I am thinking about a way of adding a bunch of switches to a system's UI without using other multiplexing methods. Since I'm already using i2c on the system I may as well hook up another device on the wire and let it act as an interface to those switches. That would simplify the project. But I really don't know if something like that already exist. Any hint?


Sorry about the noise ... I've already found out about the PCF8574 by myself :-)

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