I opened up an old bluetooth head set and found an old ATMEL626 chip. It is surface mount with 8 pins. I googled it but found nothing on it. I did find what I am guessing to be a similar chip. The ATTiny: http://www.atmel.com/dyn/resources/prod_documents/doc2586.pdf Is the ATMEL626 an older version of the ATTiny series or does it have another datasheet?

Considering that your own forum post from a few hours ago is already the 4th Google search result for ATMEL626, it doesn't seem like it's likely to be a part number. Who knows -- could be a tiny little EEPROM storing the device's Bluetooth unique ID? Or something much more complicated.

Post a photo?

Oh I see.