Datasheet PDF identified only by a document number, doc6020, at 115 KB; the name does not say which component it describes. Document numbers of this style are used by Atmel for its literature, but the exact part must be confirmed by opening the file. Once identified, use it for pinout, electrical ratings and application information. Make sure the part number on the first page matches the chip marking on the board before using any specification for diagnosis or ordering a replacement.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @datasheet. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.