Yes I have. Last night i got 23 brownouts and managed to capture the following trace on bitscope. The scope was connected directly the Vcc and 0v pins of the processor . Vertical grid is 500mv ie we are seeing two 1.8volt downward spikes. Horizontal scale is 10ms/major division ( 100ms for whole screen). I have the scope set to 'overlay' so the spikes may have been hours apart, not necessarily 2ms as shown on the screen.
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