US 9,811,204 B2
Time multiplexed touch detection and power charging
Christian M. Sauer, Cupertino, CA (US); Todd K. Moyer, Saratoga, CA (US); and Robert S. Parnell, San Jose, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Jun. 23, 2014, as Appl. No. 14/312,437.
Prior Publication US 2015/0370410 A1, Dec. 24, 2015
Int. Cl. G06F 3/041 (2006.01); G06F 3/044 (2006.01); H02J 7/00 (2006.01)
CPC G06F 3/0418 (2013.01) [G06F 3/044 (2013.01); H02J 7/0093 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method of scanning a touch sensor panel, comprising:
acquiring touch data from a plurality of touch sensors during at least one of charge and charge-free periods, the charge and charge-free periods occurring while the touch sensor panel is coupled to a charger;
determining whether the touch data was acquired during at least one of the charge periods, wherein the at least one of the charge periods includes noise received from the charger;
discarding the touch data when the touch data was acquired during the at least one of the charge periods;
in accordance with the touch data including an indication of a touch on the touch sensor panel:
generating and transmitting a first notification to the charger to operate with charge periods having a first duty cycle; and
in accordance with the touch data including an indication of an absence of a touch on the touch sensor panel:
generating and transmitting a second notification to the charger to operate with charge periods having a second duty cycle, the second duty cycle greater than the first duty cycle.