Full datasheet for the ATmega406 AVR microcontroller, a 1.68 MB PDF. This chip is designed for smart lithium battery packs, integrating cell balancing, voltage and current measurement and SMBus communication, which makes it common in laptop batteries. Technicians use the document to identify cell inputs, FET driver pins, supply and programming connections when diagnosing or unlocking a pack. Before any write operation, read and back up the existing firmware and data, as a wrong flash can permanently disable the pack.
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.