US 12,393,257 B2
Wakeup circuit
Talbott M. Houk, Monte Sereno, CA (US); Wenxun Huang, Palo Alto, CA (US); Nikola Jovanovic, Munich (DE); Floyd L. Dankert, Austin, TX (US); Sanjay Pant, Santa Clara, CA (US); Alessandro Molari, Eichenau (DE); Siarhei Meliukh, Munich (DE); Nicola Florio, Munich (DE); Ludmil N. Nikolov, Chippenham (GB); Nathan F. Hanagami, San Francisco, CA (US); Hartmut Sturm, Germering (DE); Di Zhao, Santa Clara, CA (US); Chad L. Olson, Santa Clara, CA (US); John J. Sullivan, Sunyvale, CA (US); Seyedeh Maryam Mortazavi Zanjani, Austin, TX (US); Tristan R. Hudson, Denver, CO (US); Jay B. Fletcher, Saratoga, CA (US); and Jonathan A. Dutra, Saratoga, CA (US)
Assigned to APPLE INC., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Mar. 16, 2023, as Appl. No. 18/122,410.
Claims priority of provisional application 63/404,047, filed on Sep. 6, 2022.
Prior Publication US 2024/0077932 A1, Mar. 7, 2024
Int. Cl. G06F 1/00 (2006.01); G06F 1/3212 (2019.01); G06F 1/3234 (2019.01); G06F 1/3296 (2019.01); G06F 1/3203 (2019.01)
CPC G06F 1/3296 (2013.01) [G06F 1/3212 (2013.01); G06F 1/3278 (2013.01); G06F 1/3203 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system, comprising:
a device, comprising:
a first input/output (I/O) pin;
a second I/O pin;
a first switch configured to receive a voltage from an external device via an interconnect of a connector and to pass the voltage to the first I/O pin during a first mode of operation; and
a buffer circuit with an input electrically connected to the second I/O pin and an output electrically connected to the external device via the connector; and
a second switch electrically connected to the second I/O pin, wherein:
in response to the second switch being activated, the output of the buffer circuit transitions from a first voltage value to a second voltage value,
the second voltage value is transferred to the external device via the connector, and
after the device transitions from the first mode of operation to a second mode of operation, the interconnect of the connector is configured to transfer a signal different from that of the voltage from the external device.