Help in identifying chip [AWB 1LA 11]

[oliv3r]

Hey All,

I have a nice XGS1210-12 switch https://svanheule.net/switches/zyxel_xgs1210_series, and pretty much understand most bits.

What puzzles me however, is one chip. The CPU seems to have control wires going into it, but I have no idea what it does or how it works. The chip in question has on its topside 'AWB 1LA 11', but google hasn't been very helpful.

Looking the surrounding area, we see no inductors, so it's not a DC-DC regulator?
The unused pad is also curious, as it clearly works in tandem, but not needed. I haven't seen a device that does populate the missing chip, but it goes to the CPU's SPI pins (or 3 gpio ...). My guess is a micro controller ...

A few more pics can be found at the earlier linked site..

Anybody know what it is so I can look into the datasheet?

There are no possible fan headers (the XGS1250, while similar, is slightly different and does have a fan controller, but not this chip and it's companion that I can see).

Thanks,

[tooki]

I wouldn’t be surprised if it’s a small EEPROM, with the neighboring footprint being not for a companion chip, but rather to allow alternate chip models to be used instead.

[amyk]

What are the dimensions of the package? That's not a very common footprint. My guess is an LDO of some sort, but I haven't been able to find a match either. (Archive of famous Russian site goes from AWA to AWC...)

[oliv3r]

I doubt it's an eeprom there's an SPI-NOR eeprom already holding the bootloader, the OS, and 'data' (mac addresses etc) so why a separate EEPROM? also it connects with 1 or 2 gpio's only ...

LDO I was first thinking of too, but all other power blocks have beefy trace area's and inductors, this chip only has resistors and capacitors.

The footprint is odd, however I just closed up the thing, and taking a part is a big of a pain.

But If i do some copy/paste magic, I can put it next to a 'known' footprint, the SOIC-8 EERPOM