Power analysis is a technique to probe the inner workings of an integrated circuit by measuring changes in the supply current. Whenever a logic gate switches, it will cause a tiny current spike that can be measured externally. By inspecting the temporal variation, especially in reaction to an external signal, it is often possible to deduce information about the construction of the IC.
A few years ago I used a logic analyzer to investigate the protocol of the, then new, WS2812 RGB LED. So, why not revisit this topic to test my newly acquired deep sampling oscilloscope?Continue reading “Power Analysis: Probing WS2812 RGB LEDs”