US 12,216,858 B2
Dual measurement for capacitive touch sensing and related systems, methods and devices
Feargal Cleary, Trim (IE); and Rian Whelan, Tara (IE)
Assigned to Microchip Technology Incorporated, Chandler, AZ (US)
Filed by Microchip Technology Incorporated, Chandler, AZ (US)
Filed on Dec. 20, 2021, as Appl. No. 17/645,227.
Application 17/645,227 is a continuation of application No. 16/377,612, filed on Apr. 8, 2019, granted, now 11,231,808.
Claims priority of provisional application 62/793,003, filed on Jan. 16, 2019.
Prior Publication US 2022/0147181 A1, May 12, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G06F 3/044 (2006.01); G06F 3/041 (2006.01)
CPC G06F 3/04166 (2019.05) [G06F 3/0418 (2013.01); G06F 3/044 (2013.01); G06F 2203/04107 (2013.01); G06F 2203/04108 (2013.01)] 26 Claims
OG exemplary drawing
 
1. An apparatus, comprising:
a first circuit to:
provide a driven-shield signal to at least a portion of shielding of an electrode of a touch sensor to enable the portion of the shielding as a driven-shield; and
perform a self-capacitance sensing measurement of the electrode while the portion of the shielding is enabled as the driven-shield;
a second circuit to:
provide a ground signal to at least a portion of shielding of the electrode of the touch sensor to enable the portion of the shielding as a grounded-shield, and
perform a self-capacitance sensing measurement of the electrode while the portion of the shielding is enabled as the grounded-shield; and
a logic circuit to:
determine that a self-capacitance sensing measurement by the first circuit exceeds a first threshold value; and
determine that a self-capacitance sensing measurement by the second circuit exceeds a second threshold value, the second threshold value different from the first threshold value.