PDF datasheet, 99.7 KB, for the PG12864-I display, a 128 by 64 pixel graphic module identified by variant letter I. Typical sections cover pin descriptions, DC characteristics, timing waveforms, backlight ratings and the outline with hole positions. It is the reference for checking that the host board supplies correct logic and LCD voltages, for tracing data and control lines, and for finding a mechanically compatible replacement. Double-check the variant letter, as each PG12864 version has its own pinout and dimensions.
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 @acodis_lcd_datasheets_EDID. Enginerys does not host this file.
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