Patent ID: 9660646
Date: 2017-05-23
CPC Classifications: G06F,H03K

Claim:
1. An electronic device, comprising: a capacitive sensing device that includes a plurality of capacitive sensors; a first device controller operatively connected to a first portion of the plurality of capacitive sensors, the first device controller operable to individually charge and discharge the first portion of the plurality of capacitive sensors and control charging and discharging of a common node, wherein the first device controller includes a first switching device that includes: a first switch connected to the common node; a second switch connected to the common node; a first current supply connected between a power supply and the first switch; and a second current supply connected between the second switch and a reference signal level; and a second device controller operatively connected to a second portion of the plurality of capacitive sensors but not to the first portion of the plurality of capacitive sensors, the second device controller operable to individually charge and discharge the second portion of the plurality of capacitive sensors and control charging and discharging of the common node, wherein the second device controller includes a second switching device that includes: a third switch connected to the common node; a fourth switch connected to the common node; a third current supply connected between a power supply and the third switch; and a fourth current supply connected between the fourth switch and the reference signal level.