Multiple I2C Lines

Forum 2005-2010 (read only) Hardware Troubleshooting
1

I have two IC's, an EEPROM and and the DS1307 that I would like to use, but I am not too familiar with using I2C with an Arduino Duemilanove. The EERPOM allows chaining up to 4 devices (I am only using one though), and the DT1307 seems to not have any addressing capability.

Can these two devices still be linked together on pins 4&5 or do I need to have extra I2C lines? Can the Duemilanove have multiple I2C lines?

2

Can these two devices still be linked together on pins 4&5 or do I need to have extra I2C lines? Can the Duemilanove have multiple I2C lines?

You should only need to use the two I2C lines. The I2C standard allows for up to 127 devices on the link as long as each device has a unique device address. The datasheets for the devices will state what address(s) they work at.

Lefty

3

Thanks for your help. I did find that the DS1307 has an address, but not configurable, and that the EEPROM has an address as well, but partially configurable.