Mystery Microchip IC
Added 2021-09-27 00:06:45 +0000 UTCI've been exploring what appears to be a networked node for an elevator for call buttons in the car or landing, but have been stumped by the identify of a chip that is marked with Microchip's logo and the number gaa31070aaa1
Any ideas what it might be? Microchip didn't have a datasheet and the many Chinese sellers have fake datasheets, or in the case of one, required me to set up an account before letting me see the "datasheet" then simply redirected me to Microchip's website.
(Yes I did set up a burner account on that sellers site.)
Comments
Unfortunately he wasn't able to get anything but will keep his eyes open
Namirred
2021-09-29 14:45:21 +0000 UTCI have a friend who works for Orona lifts, He is going to see if they have any info about them
Namirred
2021-09-27 10:46:57 +0000 UTChave you considered reaching out to either Howard Payne via Deviant Ollam?
Rik Kershaw-Moore
2021-09-27 06:14:09 +0000 UTCSo far I've deduced that the RSL (Remote Serial Links) network may be operating at RS485 voltage levels, but instead of using a dedicated RS485 driver, this PCB may be using a dual op-amp. I've not traced it yet to ascertain if that's the case.
Big Clive
2021-09-27 04:40:51 +0000 UTCThis seems to be the thing. Looking around, Otis has a lot of part numbers that match this format. I don't know of any SSOP28 flash chips, so this is probably a preprogrammed PIC.
2021-09-27 00:51:13 +0000 UTCFound something with a similar number from 2005 load bearing control from an elevator https://wk.baidu.com/view/5de971084a7302768e993926?pcf=2&bfetype=new
Mark Holder
2021-09-27 00:39:25 +0000 UTCssop28
Big Clive
2021-09-27 00:28:27 +0000 UTCHow old is the device? Starting with GA it might be a custom gate array (I didn't find anything if microchip made such before)
2021-09-27 00:25:24 +0000 UTCI did consider a custom programmed chip, but there are quite a lot of Chinese sellers claiming to have it in stock.
Big Clive
2021-09-27 00:25:23 +0000 UTCif it was a high volume board, perhaps it was a pre-programmed OTP micro-controller direct from microchip. i've negotiated similar thing with providers on bulk orders.
2021-09-27 00:17:21 +0000 UTCphoto of the board might help.
2021-09-27 00:10:47 +0000 UTCI don't suppose there is any obvious programming pins SPI/JTAG/UPDI etc? If so, you might be able to read a device IC from it.
Dave Curran
2021-09-27 00:10:00 +0000 UTCWhat package is it in?
WizardTim
2021-09-27 00:09:22 +0000 UTC
