US 12,147,626 B2
Digital-to-analog controller-referenced touch sensing system, and related systems, methods, and devices
Fredrik Jonsson, Gävle Gävleborg (SE); Richard P. Collins, Southampton (GB); and Lionel Nicolas Portmann, Vaud (CH)
Assigned to Microchip Technology Incorporated, Chandler, AZ (US)
Filed by Microchip Technology Incorporated, Chandler, AZ (US)
Filed on Dec. 9, 2021, as Appl. No. 17/643,537.
Application 17/643,537 is a continuation of application No. 16/379,687, filed on Apr. 9, 2019, granted, now 11,221,708.
Claims priority of provisional application 62/785,141, filed on Dec. 26, 2018.
Prior Publication US 2022/0100309 A1, Mar. 31, 2022
Int. Cl. G06F 3/041 (2006.01); G06F 3/044 (2006.01)
CPC G06F 3/0416 (2013.01) [G06F 3/044 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A method, comprising:
selecting a first code of a number of codes, each of the number of codes stored for a respective waveform shape to input to a digital-to-analog converter (DAC);
providing a first stored code, wherein the first stored code for a first waveform shape is associated with a first sampling rate;
providing a first reference signal shaped for a touch sensor of a driver responsive to the first stored code for the first waveform shape;
generating a drive signal for the touch sensor responsive to the first shaped reference signal; and
reporting a touch responsive to a changed signal level of the drive signal.