US 11,811,398 B2
Capacitance sensing device operation method
Wang-An Lin, Jhubei (TW); Chung-Jung Wu, Jhubei (TW); and Chun-Lun Wang, Jhubei (TW)
Assigned to Sensortek Technology Corp, Jhubei (TW)
Filed by SENSORTEK TECHNOLOGY CORP., Jhubei (TW)
Filed on Apr. 1, 2021, as Appl. No. 17/220,288.
Claims priority of provisional application 63/005,432, filed on Apr. 5, 2020.
Prior Publication US 2022/0057540 A1, Feb. 24, 2022
Int. Cl. H03K 17/955 (2006.01); H03K 17/96 (2006.01); G01R 27/26 (2006.01); G01V 3/08 (2006.01); G06F 1/3231 (2019.01); G06F 3/01 (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)] 13 Claims
OG exemplary drawing
 
1. A capacitance sensing device operation method, which is implemented by a signal processing circuit, a baseline processing circuit and a proximity sensing circuit; the capacitance sensing device operation method includes:
the signal processing circuit receiving a detecting data;
the baseline processing circuit calculating the difference between the detecting data and the detecting data received from the previous data frame;
the proximity sensing circuit implementing a comparing operation on the detecting data and a preserved baseline value to judge if a proximity event occurs or not;
wherein when the proximity event is occurred, the baseline processing circuit selects one of a plurality of proximity baseline updating procedures to update the baseline value based on the range in which the difference falls within;
when the proximity event is not occurred, the baseline processing circuit uses a non-proximity baseline value updating procedure to update the baseline value; and
the baseline processing circuit outputs the updated baseline value to the proximity sensing circuit.