Integrated capacitance model circuit
First Claim
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1. An integrated circuit comprising:
- a capacitance-sensing device disposed on an common carrier substrate of the integrated circuit; and
a capacitance model circuit disposed on the common carrier substrate, wherein the capacitance model circuit is configured to model a capacitance of an external sense array, and wherein the capacitance model circuit is programmable, wherein the capacitance model circuit comprises;
an input comprising a switch coupled to receive a transmit (TX) signal;
an output comprising a plurality of switches coupled to output a receive (RX) signal; and
a plurality of programmable capacitors coupled to at least one of the input or output, wherein the plurality of programmable capacitors comprises;
a first set of one or more capacitors coupled between the input and output;
a first set of one or more switches, each coupled to one of the first set of capacitors to turn on and off the corresponding capacitor;
a second set of one or more capacitors coupled between a ground potential and the output; and
a second set of one or more switches, each coupled to one of the second set of capacitors to turn on and off the corresponding capacitor.
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Abstract
Apparatuses and methods of an integrated capacitance model circuit are described. A capacitance model circuit is disposed on a common carrier substrate of an integrated circuit (IC) having a capacitance-sensing device. The capacitance model circuit is configured to model a capacitance of an external sense array. The capacitance model circuit is programmable.
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Citations
13 Claims
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1. An integrated circuit comprising:
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a capacitance-sensing device disposed on an common carrier substrate of the integrated circuit; and a capacitance model circuit disposed on the common carrier substrate, wherein the capacitance model circuit is configured to model a capacitance of an external sense array, and wherein the capacitance model circuit is programmable, wherein the capacitance model circuit comprises; an input comprising a switch coupled to receive a transmit (TX) signal; an output comprising a plurality of switches coupled to output a receive (RX) signal; and a plurality of programmable capacitors coupled to at least one of the input or output, wherein the plurality of programmable capacitors comprises; a first set of one or more capacitors coupled between the input and output; a first set of one or more switches, each coupled to one of the first set of capacitors to turn on and off the corresponding capacitor; a second set of one or more capacitors coupled between a ground potential and the output; and a second set of one or more switches, each coupled to one of the second set of capacitors to turn on and off the corresponding capacitor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An integrated circuit comprising:
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a capacitance-sensing circuit comprising a plurality of sensing channels; and a capacitance model circuit comprising a plurality of programmable capacitors, wherein the capacitance model circuit is configured to model a capacitance of an external sense array to test the plurality of sensing channels of the capacitance-sensing circuit, wherein the capacitance-sensing circuit comprises; a transmitter; and a sequencer coupled to the capacitance model circuit, wherein the sequencer is configured to couple the transmitter to an input of the capacitance model circuit and to couple an output of the capacitance model circuit to one or more of the plurality of sensing channels. - View Dependent Claims (13)
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Specification