The oscillator mentioned in the article is a SiT1532 made by SiTime <http://SiT1532>. It's sold in a chip scale package that's only 1.5mm x .9mm, which means it'a no much more than a chip of silicon with some solder balls attached. The data sheet indicates there is a "polymer" coating on the back side of the chip, but the working surface would be in the bottom where the solder balls are. There is a rectangular protrusion shown on the "Dimensions and Patterns" section (page 12) that's right over where the MEMS mechanism would sit that might be some type of seal, but there is no descriptive text.
The curious thing to me is that some iPhones are said not to recover from exposure to helium but, as an essentially mechanical device, I can think of no reason that the SiT1532 would not recover from exposure to helium after the gas had migrated out. I wonder off the iPhone could be damaged by an oscillator failure, o one that's running off frequency? The devices sell for about $1.25 at Mouser and I have a tank of helium in the garage, so I'm thinking about doing an experiment. The only problems is finding a way to solder wires to such a small part? Might have to make a PCB, instead. Wayne On Wed, Oct 31, 2018 at 12:51 PM Mark Sims <hol...@hotmail.com> wrote: > https://ifixit.org/blog/11986/iphones-are-allergic-to-helium/ > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.