US 12,250,099 B2
External activation of quiescent device
Marciano Preciado, Salt Lake City, UT (US); Sterling Thomas Sleight, Murray, UT (US); and Jeremy David Fillingim, Salt Lake City, UT (US)
Assigned to PassiveLogic, Inc., Holladay, UT (US)
Filed by PassiveLogic, Inc., Salt Lake City, UT (US)
Filed on Sep. 8, 2021, as Appl. No. 17/469,671.
Prior Publication US 2023/0071312 A1, Mar. 9, 2023
Int. Cl. H04L 15/24 (2006.01); H04L 9/32 (2006.01); H04L 12/12 (2006.01)
CPC H04L 15/24 (2013.01) [H04L 9/3234 (2013.01); H04L 12/12 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A device capable of external activation comprising:
a light detection circuit adapted to receive a light signal from a light source;
a high pass filter coupled to the light detection circuit that when receiving light of at least a given intensity produces a spike;
a power manager chip coupled to the light detection circuit that upon receipt of the spike enables power to a microcontroller;
a component capable of inhabiting: a detection state in which:
a spike is detected; and when a spike is found, a spike counter is incremented;
a timer that measures a time between spikes;
wherein when the time between spikes exceeds an END OF WORD length, the spike counter is cleared;
wherein when the spike counter reaches a wakeup threshold then subsequent spikes and delay lengths are interpreted as a transmitted message; and
wherein the wakeup threshold is of sufficient length to allow the microcontroller to boot.