Eye-Fi Connect X2 SD Card Teardown
A decade or so ago, this was the coolest tech. The fact that they were able to wire-in an entire wireless interface inside of a standard sd memory card was immensely impressive.
Of course with how innovative of a product this was, they’d want their branding on the microcontroller.
It looks like someone was really pleased with how the product name lined up with the fiducial in the corner.
Some of these pcb traces are absolutely minuscule.
An uncommon 0.25mm pcb thickness.