Something like this, no chip required only external eeprom and 2 resistors.
http://evertdekker.com/Joomla/index.php?option=com_content&task=view&id=60&Itemid=99
Example project;
http://evertdekker.com/Joomla/index.php?option=com_content&task=view&id=78&Itemid=117
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