Quote:
Originally Posted by twobob
Oooh. Field effect. never considered that one what with my background in spinning rust it seemed counter intuitive but now you say it... hmm..
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For example:
http://www.micropac.com/pdf/products/65017.pdf
A better part for this specific purpose could probably be found, but that one should be a typical example.
That one would do the job of being the "USB Downloader Switch" when a cer-magnet was brought close to case back.
Similar parts can be found in low voltage, "brushless", DC fans as the "commutator" part.
So if the machine has internal switch or switch pads that need to be closed to enable the USB / Serial Downloader mode - it could be hardware retro-fitted with a sensor from a salvaged fan.
Its operating power could come from one of the switched lines that get turned off after the SoC re-sets and re-starts.
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A PS on getting it open: "Heat Guns" (hot air guns) are now a common item on the re-work bench - that is what is used to place/re-place the SMT parts.
So using one to get the "hot glue" to release is not that far fetched an idea.