US 12,445,129 B2
Proximity detection method and circuit thereof
Wang-An Lin, Jhubei (TW); Ming-Che Yang, Jhubei (TW); Min-Chun Tuan, Jhubei (TW); and Chung-Jung Wu, Jhubei (TW)
Assigned to Sensortek Technology Corp., Jhubei (TW)
Filed by SENSORTEK TECHNOLOGY CORP., Jhubei (TW)
Filed on Apr. 5, 2021, as Appl. No. 17/222,271.
Claims priority of provisional application 63/005,432, filed on Apr. 5, 2020.
Prior Publication US 2022/0021387 A1, Jan. 20, 2022
Int. Cl. H03K 17/955 (2006.01); G01R 27/26 (2006.01); G01V 3/08 (2006.01); G06F 1/3231 (2019.01); G06F 3/01 (2006.01); H03K 17/96 (2006.01)
CPC H03K 17/955 (2013.01) [G01R 27/2605 (2013.01); G01V 3/088 (2013.01); G06F 1/3231 (2013.01); G06F 3/011 (2013.01); H03K 17/962 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A proximity detection method, applied to an electronic device, comprising:
detecting a capacitance of an electrode for generating a detection data by a detection circuit;
generating a baseline data according to said detection data by a baseline generating circuit receiving said detection data;
generating a proximity signal according to a proximity threshold and a difference value between said detection data and said baseline data by a proximity sensing circuit receiving said detection data and said baseline data, wherein said proximity signal represents the proximity of a human body or an object to said electronic device; and
judging said proximity signal is valid or not to confirm that the proximity is occurred or not according to said detection data, a reference data, and a valid threshold by said proximity sensing circuit.