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Update CAR066 with root cause

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doppelhub
2024-07-24 13:24:43 -04:00
parent bf3733ed2d
commit 0aec8e2790
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Electronics/PCB (KiCAD)/Motherboard/RevD/CARs/CAR066 - 16U2 toggles reset ~2.5 seconds after powerup/CAR066 - 16U2 toggles reset pin ~2.5 seconds after powerup.txt
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16U2 toggle PD7 ~2.5 seconds after powerup. This causes pulse on MEGA2560's reset pin, which briefly disables Mega's output pins... but for some reason doesn't actually reset program execution.
16U2 toggle PD7 ~2.5 seconds after powerup. This causes pulse on MEGA2560's reset pin, which briefly disables Mega's output pins... but for some reason doesn't actually reset program execution.
This only occurs when USB cable is connected during powerup. Given that a USB cable typically powers the 5V rail, this won't actually ever occur; in my testing that lead to this CAR, my USB cable's 5V wire was cut.