Datasheet PDF of 426 KB identified only as doc6318, so the file name gives no clue about the component. This pattern matches Atmel's document numbering for datasheets and application notes, and the device name is printed at the top of the first page. Once opened it provides pin assignments, absolute maximum ratings and typical application information. Before applying the data on a repair, make sure the part number, package and revision described match the marking of the chip fitted on the board.
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.