Abstract: One or more examples relate, generally, to a method for capacitive touch sensing that includes: performing first self-capacitance measurement of an electrode of a touch sensor while a driven shield-signal is provided to at least a portion of shielding of the electrode; determining a first touch sensing result at least partially responsive to determining that a value representing performing first self-capacitance measurement exceeds a first threshold value; performing second self-capacitance measurement of the electrode of the touch sensor while a ground signal is provided to at least the portion of shielding of the electrode; determining a second touch sensing result at least partially responsive to determining that a value representing performing second self-capacitance measurement exceeds a second threshold value, the second threshold value different from the first threshold value; and determining a touch result responsive to both the first touch sensing result and the second touch sensing result being indi

Abstract: Disclosed embodiments relate, generally, to a dual measurement technique for capacitance sensing, and related systems and methods. In one embodiment, a capacitance sensing method characterized by moisture tolerance is performed and another capacitance sensing method characterized by proximity tolerance is performed. In one embodiment, the method characterized by moisture tolerance is a driven-shield self-capacitance sensing measurement, and the method characterized by proximity tolerance is a grounded-shield self-capacitance sensing measurement.

Abstract: Embodiments of the disclosure relate, generally, to techniques for parallel acquisition and measurements and related circuits, systems and devices that implement those techniques. A technique for parallel acquisition and measurement generally includes simultaneously acquiring sensed signals from multiple sensor channels and determining channel capacitance measurements responsive to the sensed signals.

Abstract: Disclosed embodiments relate, generally, to a dual measurement technique for capacitance sensing, and related systems and methods. In one embodiment, a capacitance sensing method characterized by moisture tolerance is performed and another capacitance sensing method characterized by proximity tolerance is performed. In one embodiment, the method characterized by moisture tolerance is a driven-shield self-capacitance sensing measurement, and the method characterized by proximity tolerance is a grounded-shield self-capacitance sensing measurement.

Abstract: Embodiments of the disclosure relate, generally, to techniques for parallel acquisition and measurements and related circuits, systems and devices that implement those techniques. A technique for parallel acquisition and measurement generally includes simultaneously acquiring sensed signals from multiple sensor channels and determining channel capacitance measurements responsive to the sensed signals.

Abstract: In certain embodiments, a method includes applying voltage to a sensor that includes first and second electrode tracks, the sensor proximate to a conductor depressible relative to the sensor and located between a button and the sensor. The conductor can capacitively couple with a capacitive node formed by the tracks, and the button can capacitively couple with an object. A value of a capacitance at the node is measured, the capacitance reflecting an amount of capacitive coupling between the conductor and the node. In response to the value meeting a first condition, a first button state is detected, indicating the object is within a detectable distance of and not in contact with the button. In response to the value meeting a second condition, a second button state is detected, indicating the object is in contact with the button and the conductor is not in contact with the sensor.

Abstract: In one embodiment, a device includes one or more processors and one or more memory units. The one or more memory units collectively store logic configured to cause the one or more processors to perform operations including obtaining a first measurement associated with a first voltage, the first voltage output by the mutual-capacitance measurement circuit in response to a first change in capacitance, and obtaining a second measurement associated with a second voltage, the second voltage output by the mutual-capacitance measurement circuit in response to a second change in capacitance. The operations further include calculating a differential measurement using a difference between the first measurement and the second measurement and determining whether a touch or proximity event has occurred based at least in part on the calculated differential measurement.

Abstract: In one embodiment, a method includes applying a supply voltage across a compensation capacitor; dividing charge between a capacitance of a touch sensor and the compensation capacitor; and performing the application of the supply voltage and the dividing of charge a pre-determined number of times. A first amount of charge of the compensation capacitor results in a first voltage at an input node. The method also includes applying a reference voltage at the input node. The application of the reference voltage at the input node induces a second amount of charge proportional to a difference between the first voltage and the reference voltage on an integration capacitor. The method also includes determining a first difference between the first voltage and the reference voltage based on a second amount of charge on the integration capacitor; and determining whether a touch input to the touch sensor has occurred based on the difference.

Abstract: In one embodiment, a device includes one or more processors and one or more memory units. The one or more memory units collectively store logic configured to cause the one or more processors to perform operations including obtaining a first measurement associated with a first voltage, the first voltage output by the mutual-capacitance measurement circuit in response to a first change in capacitance, and obtaining a second measurement associated with a second voltage, the second voltage output by the mutual-capacitance measurement circuit in response to a second change in capacitance. The operations further include calculating a differential measurement using a difference between the first measurement and the second measurement and determining whether a touch or proximity event has occurred based at least in part on the calculated differential measurement.

Abstract: In one embodiment, an apparatus includes a sensor, a button, a conductor between the button and the sensor, and a controller connected to the sensor. The sensor includes first and second electrode tracks. The button includes an electrically isolating material and is configured to capacitively couple with an object. The conductor is configured to capacitively couple with the sensor and form a galvanic connection between the first and second electrode tracks when the conductor comes into contact with the sensor. The controller is configured to measure a value associated with an amount of capacitive coupling between the conductor and the sensor and to detect first and second states of the button based on the value, the first state indicating that the object is in contact with the button and that the conductor is not contacting the sensor, and the second state indicating that the conductor is not contacting the sensor.

Abstract: In one embodiment, a device comprises one or more memory units collectively storing logic configured to cause one or more processors to perform operations. The operations comprise: obtaining a first measurement associated with a first voltage output by a mutual-capacitance measurement circuit; obtaining a second measurement associated with a second voltage, the second voltage output by the mutual-capacitance measurement circuit in response to a first change in capacitance; obtaining a third measurement associated with a third voltage output by the mutual capacitance measurement circuit, the third voltage being different from the first voltage; and obtaining a fourth measurement associated with a fourth voltage, the fourth voltage output by the mutual-capacitance measurement circuit in response to a second change in capacitance.

Abstract: In an embodiment, a touch sensing circuit comprises a plurality of sensor channels and a controller circuit coupled to the plurality of sensor channels. The controller circuit is configured to: map the sensor channels to lumped sensors; scan, during a scan period, the lumped sensors to detect touch input; and responsive to detecting touch input associated with at least one of the lumped sensors, scan the sensor channels mapped to the at least one lumped sensor.

Abstract: In one embodiment, an apparatus includes a sensor, a button, a conductor between the button and the sensor, and a controller connected to the sensor. The sensor includes first and second electrode tracks. The button includes an electrically isolating material and is configured to capacitively couple with an object. The conductor is configured to capacitively couple with the sensor and form a galvanic connection between the first and second electrode tracks when the conductor comes into contact with the sensor. The controller is configured to measure a value associated with an amount of capacitive coupling between the conductor and the sensor and to detect first and second states of the button based on the value, the first state indicating that the object is in contact with the button and that the conductor is not contacting the sensor, and the second state indicating that the conductor is not contacting the sensor.

Abstract: In one embodiment, a method includes deactivating an integrator of a mutual-capacitive measurement circuit and configuring the mutual-capacitive measurement circuit according to a first voltage configuration. The first voltage configuration results in a charge on a sensor capacitor and a compensation capacitor when a supply voltage is applied to the mutual-capacitive measurement circuit. The method also includes adjusting a variable reference voltage input of the integrator to a first reference voltage, wherein the first reference voltage is selected to increase an output range of the mutual-capacitive measurement circuit. The method also includes applying the supply voltage to the mutual-capacitive measurement circuit and obtaining a first reference measurement from an analog-digital-converter coupled to an output of the mutual-capacitance measurement circuit.

Abstract: In one embodiment, a method includes deactivating an integrator of a mutual-capacitive measurement circuit and configuring the mutual-capacitive measurement circuit according to a first voltage configuration. The first voltage configuration results in a charge on a sensor capacitor and a compensation capacitor when a supply voltage is applied to the mutual-capacitive measurement circuit. The method also includes adjusting a variable reference voltage input of the integrator to a first reference voltage, wherein the first reference voltage is selected to increase an output range of the mutual-capacitive measurement circuit. The method also includes applying the supply voltage to the mutual-capacitive measurement circuit and obtaining a first reference measurement from an analog-digital-converter coupled to an output of the mutual-capacitance measurement circuit.

Abstract: In one embodiment, a method includes dividing a first amount of charge between a measurement capacitance and a sample-and-hold capacitor resulting in a voltage at the measurement capacitance being a first voltage. The division of the first amount of charge is based at least in part on a configuration of a compensation capacitor relative to the measurement capacitance and the sample-and-hold capacitor. The configuration being determined based at least in part on an output without the compensation capacitor. The method also includes determining a first difference between the first voltage at the capacitance and a reference voltage; and determining whether a touch input to the touch sensor has occurred based at least in part on the first difference.

Abstract: In one embodiment, a method includes dividing a first amount of charge between a capacitance of a touch sensor and a compensation capacitor. The division of the first amount of charge results in a first voltage at an input node. The method also includes isolating the capacitance of the touch sensor from the compensation capacitor; and applying a reference voltage at the input node and a supply voltage at the compensation capacitor. The application of the reference voltage at the input node induces a second amount of charge proportional to a difference between the first voltage and the reference voltage on an integration capacitor. The method also includes determining a first difference between the first voltage and the reference voltage based on a second amount of charge on the integration capacitor; and determining whether a touch input to the touch sensor has occurred based on the first difference.

Abstract: In one embodiment, a method includes dividing a first amount of charge between a capacitance of a touch sensor and a compensation capacitor. The division of the first amount of charge results in a first voltage at an input node. The method also includes applying a reference voltage at the input node. The application of the reference voltage at the input node induces a second amount of charge proportional to a difference between the first voltage and the reference voltage on an integration capacitor. The method also includes determining a first difference between the first voltage and the reference voltage based on a second amount of charge on the integration capacitor; and determining whether a touch input to the touch sensor has occurred based on the first difference.

Abstract: In one embodiment, an apparatus includes a sensor, a button, a conductor between the button and the sensor, and a controller connected to the sensor. The sensor includes first and second electrode tracks. The button includes an electrically isolating material and is configured to capacitively couple with an object. The conductor is configured to capacitively couple with the sensor and form a galvanic connection between the first and second electrode tracks when the conductor comes into contact with the sensor. The controller is configured to measure a value associated with an amount of capacitive coupling between the conductor and the sensor and to detect first and second states of the button based on the value, the first state indicating that the object is in contact with the button and that the conductor is not contacting the sensor, and the second state indicating that the conductor is not contacting the sensor.

Abstract: In one embodiment, an apparatus includes a capacitive sensor, a button, a support, and a controller. The button includes a first material having a distal coupling portion and a proximal coupling portion. The distal coupling portion is distal from the capacitive sensor and configured to capacitively couple with an object. The proximal coupling portion is proximal to the capacitive sensor and configured to capacitively couple with the capacitive sensor. The support is connected to the button and configured to deflect when the button is pressed. The controller is connected to the capacitive sensor and configured to measure a value associated with an amount of capacitive coupling between the button and the capacitive sensor, which is based on an amount of capacitive coupling between the distal coupling portion and the object and a distance between the proximal coupling portion and the capacitive sensor.