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Forum Index : Microcontroller and PC projects : I2C pullup voltage?

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Bizzie
Senior Member

Joined: 06/07/2014
Location: Australia
Posts: 185
Posted: 08:57pm 05 Jan 2015
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I have a logging system which has been successfully working for nearly 3 years. It consists of a PicAxe 20X2 acting as the master scanning up to 5 PA 20X2's using I2C.

I would like to replace the master with a CGColorMax2 so I can get access to the data over the Internet and also be able to write the data to SD.

What voltage should I pull the two I2C signal lines to? The MM pins are 5V tolerant so I assume it would be 5 volts.

Rob White
 
TassyJim

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Joined: 07/08/2011
Location: Australia
Posts: 5905
Posted: 09:01pm 05 Jan 2015
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5V or 3.3V depending on the requirements of the other devices.

JimEdited by TassyJim 2015-01-07
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