Can you recognize this chip?

[Aller]

Hi Everybody.
I have a self-darkening visor/shield from a 3m Speedglas 9100XX Adflo Welding Helmet with 1 component reporting short on the circuit board. I can't find any data on this component - see the picture.

Can anybody kick me in the right direction? PLEASE!

[fzabkar]

I've been reading a patent which makes reference to a 3-axis motion sensor:

https://patentimages.storage.googleapis.com/26/11/a9/c9db666a4ce284/US20060285330A1.pdf

A subsequent search for a MEMS motion sensor turned up this STMicroelectronics part:

https://www.mouser.com/datasheet/2/389/iis2dlpc-1483239.pdf

The package style is LGA-12.

TDK (InvenSense) is another manufacturer of these devices.

This looks promising:

https://www.integrated-circuit.com/products-detail/LIS2DH12TR/EIS-3450209.html

https://www.integrated-circuit.com/pdf/489/983/8.pdf (LIS2DH12TR datasheet)




Here are a few others:

https://ipv4.google.com/search?q=%22lga-12%22+filetype%3Apdf+%22absolute+maximum%22+MEMS+digital+output+motion+sensor+site%3Ast.com

Among the applications listed in some datasheets is "motion detector for wearables". Some sensors also incorporate an additional temperature sensor.

Here is ST's 2017 web site:

https://web.archive.org/web/20170815205528/http://www.st.com/content/st_com/en/products/mems-and-sensors/accelerometers.html?querycriteria=productId=SC444

I'm assuming that "731" is a Year/Week date code, ie week 31 of 2017. The part number is probably in the QR code.

There are a handful of possible candidates on ST's 2107 web site. Some are 1.0mm thick, others are 0.86mm. One has a nominal Vcc of 1.8V, the others are 2.5V. If you measure the voltage at the Vcc pad, and break out a micrometer, you should be able to reduce the number of possibles to 2 or 3.

Finally I would place the chip on a flatbed scanner, scan it at max resolution, and then decipher its QR code.


WARNING: Please revisit your speedometer thread. I think I may have misidentified your Zener.