Sigma Mini Keychain LCD Photoframe

Front
Front

This is a cheap Sigma branded keychain photoframe. User buttons for power & selecting photos are on the left.
There are two white LEDs on the bottom edge that function as a torch as well.

Display
Display

Front of the unit removed, showing the LCD module. The USB jack is bottom left, next to the pair of white LEDs & above that is the 32kHz watch crystal that the CPU uses for timekeeping.

Back Removed
Back Removed

Here the back has been removed showing the 3.7v Li-Ion cell used to provide power.

Display Folded Back
Display Folded Back

Here the display has been removed from the PCB exposing the chipset.

Chipset
Chipset

Here the CPU blob-top chip & a flash memory IC are visible. The CPU is a Sitronix ST2205U.

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