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Adaptive resolution circuit

  • US 8,810,263 B1
  • Filed: 09/10/2013
  • Issued: 08/19/2014
  • Est. Priority Date: 03/12/2013
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • an input node coupled to a capacitance sense pin coupled to an electrode of a sense array;

    a capacitance-sensing circuit coupled to the input node, wherein the capacitance-sensing circuit comprises;

    a signal generator coupled to a second capacitance sense pin coupled to a second electrode of the sense array;

    an integrator configured to measure a first mutual capacitance of an intersection between the electrode and the second electrode with a first resolution;

    a first integrator capacitor coupled between the input node and an output of the integrator; and

    an adaptive resolution circuit coupled to the capacitance-sensing circuit and the input node, wherein the adaptive resolution circuit is configured to selectively modify an integration parameter to set the integrator to measure a second mutual capacitance of the intersection with a second resolution, wherein the integration parameter is an integration capacitance of the integrator, and wherein the adaptive resolution circuit comprises;

    a second capacitor;

    a comparator coupled to the output of the integrator; and

    a switch coupled to an output of the comparator, wherein the comparator is to selectively switch the second capacitor in parallel to the first integrator capacitor of the capacitance-sensing circuit to modify the integration capacitance of the integrator for the second resolution.

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