Duplicate copy of a 161 KB PDF numbered 317091, with two copy markers added by the browser, and no brand or model in its name. Its size matches the other file of the same number, so the content is very likely identical. It may be a component datasheet or a brief technical note rather than a full board diagram. Review the first page to identify it, and use it for pinouts and reference values only after confirming the marking on the chip or the board revision matches the document.
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 @one5technology. 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.