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Multiple capacitive (button) sensor with reduced pinout

  • US 8,653,741 B2
  • Filed: 01/18/2012
  • Issued: 02/18/2014
  • Est. Priority Date: 01/19/2011
  • Status: Active Grant
First Claim
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1. An electronic touch sensor device comprising:

  • a control circuit;

    at least one light emitting diode (LED) having a first electrode and a second electrode;

    at least one input/output circuit operatively connected to the control circuit and comprising;

    a capacitive sense circuit configured to detect a change in capacitance when an object approaches the touch sensor device, wherein the capacitive sense circuit is selectively disabled and enabled by the control circuit;

    an LED driver circuit configured to drive the first electrode of the at least one LED, wherein the LED driver circuit is selectively enabled and disabled by the control circuit;

    wherein the LED driver circuit is disabled when the capacitive sense circuit is enabled, and wherein the LED driver circuit is enabled when the capacitive sense circuit is disabled; and

    a bias driver circuit configured to drive the second electrode of the at least one LED.

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