On a related note: If my sensors are buffered and gated to sys_resetn am I safe if the BBB powers down a few ms before the rest? My circuit watches the 3.3V regulator output and when it falls away the power for the entire circuit is killed as well but it takes 5-9ms for the power controller to notice and react to the condition. My buffers are connected to SYS_RESETN via a schmidt-inverter driving the /OE gates for the pins.
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