Hi @TechMonkey this should be an Atmel i2c/spi eeprom… What makes it confusing, for users.
The ATMLH846 is not the part number, it’s the eeprom + date code…
8 = Y = year 2008
46 = WW = 46th week…
The actual model is “5EBL”… which can be fun to dig thru Atmel/Microchip datasheet’s to find the matching value…
Edit: oh fun, ‘5’ might be AT25 eeprom! 
still looking…
Edit 2: got it…
5EB = AT25256B =
L = L: 1.8V min
Microchip Docs: https://www.microchip.com/en-us/product/AT25256B
Regards,