On Thu, Jul 27, 2017, at 09:46 PM, Trent Piepho wrote: > Looks like it still says "DALLAS SEMICONDUCTOR" to the left of Maxim. > Maybe Maxim only wanted to change the mask enough to find some empty > space to sign it?
It does indeed say "DALLAS SEMICONDUCTOR". I managed to get some high-quality photos using the microscope's on-board camera and have updated the photo album at https://imgur.com/a/0zudj with the newest ones (they're the all-rectangular photos below the two circular photos). There's some high-resolution composite images. Some things I found interesting: - There's a section just above the "Maxim" part that has several snippets of text ("17A3", "16A3", etc.). In normal light, each of these bits of text is a different color, where the colors correspond to different layers of the chip. Each bit of text has a different depth of focus, indicating they're physically closer or further from the lens. Does anyone know what material the colors might correspond to? - There's several square grids of circles-in-squares circuit elements. I have no idea what these are. - I find it remarkable that this circuit can operate on less than a microamp during normal usage, including temperature conversion. The DS3231 has on-board temperature monitoring to correct the crystal frequency: is this something where they would have bothered putting a separate sensor next to the crystal itself, or are the die and the crystal are close enough and in the same package that they could use an on-die sensor like a diode and call that "good enough"? Cheers! -Pete -- Pete Stephenson _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
