Christoph TackAs #TritiLED does it on design V3.0, the MCU sleeps while two PWMs remain active. The first PWM controls the power to the 74xx123, the second PWM initiates the pulse.
"One shot timer" aka "Monostable multivibrator"
A project log for Ultra low power LED
<1.5µA current consumption when continuously on, optional flashing mode
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