Cypress Semiconductor Corporation

Parade Technologies, Ltd.

Analog Devices,inc.

Daniel O'Keeffe

Hans Klein

Denis Ellis

Dennis Raymond Seguine

Paul M Walsh

Kofi Makinwa

Kevin J Gallagher

Çagri Gürleyük

Viktor Kremin

Edward L Grivna

Oleksandr Pirogov

Jens Weber

Brendan Lawton

Dermot MacSweeney

Mark Healy

Andrew Kinane

Khosrov D Sadeghipour

Gaurav Panchanan

Matheus Pimenta

Yarsolav Lek

Bruce E Byrkett

Maksym Prybytko

Dermot Macsweeney

Front-end circuits that combine inductive and capacitive sensing are described. In one embodiment, an apparatus includes a plurality of inductive elements, an inductive measurement circuit, and a frequency divider circuit. The inductive measurement circuit is to output a first signal with a first frequency. The first signal is associated with an inductance change of one of the inductive elements. A feedback circuit can maintain the sinusoidal operation of the first signal. The frequency divider circuit can generate a second signal with a second frequency that is lower than the first frequency.

High performance inductive sensing all digital phase locked loop

Apparatuses and methods of shielding for capacitance-to-digital code conversion are described. One apparatus includes a capacitance-to-digital converter (CDC) for measuring a self-capacitance of a sensor electrode. The capacitance-to-digital code converter can in a first phase, apply a supply voltage to the sensor electrode. The sensor electrode and a shield electrode, the form a mutual capacitance with the sensor electrode. The CDC, in a second phase, couples the shield electrode to a ground potential and the sensor electrode to a first modulation capacitor. The first modulation capacitor is pre-charged to a reference voltage. The CDC, in a third phase, couples the sensor electrode and the shield electrode to the ground potential. The CDC, in a fourth phase, couples the shield electrode to the ground potential and the sensor electrode to a second modulation capacitor. The second modulation capacitor is pre-charged to the reference voltage.

System, method, and apparatus for passive shielding of a capacitive sensing button

One inductive sensor is configured to maintain a fixed frequency in a resonant circuit. One apparatus includes an inductance-to-digital converter (LDC). The LDC includes a digital filter to measure an inductance change of a sensor and convert the inductance change to a digital value. The LDC further includes a digital control loop to maintain a fixed frequency in the sensor. The sensor forms an oscillator in the digital control loop. An output of the digital control loop is representative of the inductance change of the sensor.

Technology directed to low-emissions touch controller in in-cell touch display systems is described. One in-cell touch controller includes a signal generator circuit that is configured to generate a sense signal according to a sensing function, the sense signal including a windowed sinusoidal waveform. The controller generates a transition signal to transition the in-cell touch display between a display function and the sensing function. The controller drives the sense signal and the transition signal on common voltage (VCOM) layer of electrodes during a touch scanning interval. During a display function interval an integrated display driver is configured to drive a first signal on the VCOM layer of electrodes during a display function interval.

Low-emissions touch controller

An apparatus may include an internal charge pump within an integrated circuit package, an external pin positioned at an exterior of the integrated circuit package, and a select circuit configured to operate independently from the internal charge pump and located within the integrated circuit package, wherein the select circuit is configurable to selectively couple at least one of the internal charge pump and the external pin to a transmit (TX) sensor electrode.

Touch sensor driver with selectable charge source

An apparatus includes a reconfigurable charge pump including charge pump cells configurable into multiple different arrangements. The apparatus includes a control device configured to select a first arrangement of the charge pump cells from the multiple different arrangements based, at least in part, on an input voltage received by the reconfigurable charge pump and requested parameters of a drive signal for a touch screen panel. The reconfigurable charge pump can boost the input voltage based, at least in part, on the first arrangement of the charge pump cells. The control device can generate the drive signal according to the requested parameters based on the boosted input voltage.

Reconfigurable charge pump

A circuit for generating a voltage is disclosed. The voltage has an amplitude greater than an available power supply. The circuit includes a driver to supply the voltage on an output terminal to an electrode of a touch sense array. The circuit also includes a charge pump array coupled to the driver. The charge pump array includes an array of charge pumps to supply an input voltage to the driver. The circuit also includes a feedback circuit coupled to the charge pump array. The feedback circuit is configured to measure the input voltage and to select different combinations of the array of charge pumps to maintain the voltage on the output terminal.

Circuit to provide signal to sense array

An apparatus includes a down pump configured to generate a regulated voltage signal based, at least in part, on an input voltage and a reference voltage. The apparatus includes a level shifter configured to generate an activation signal having a voltage level corresponding to the reference voltage based, at least in part, on the input voltage and the regulated voltage signal. The apparatus includes a switching device configured to generate a drive signal corresponding to the input voltage in response to the activation signal.

Adaptive drive system

An apparatus includes a charge pump array including multiple charge pump cells. The charge pump array is configurable into a first arrangement of the charge pump cells coupled in series or a second arrangement of the charge pump cells coupled in parallel. The apparatus can include reconfiguration circuitry configured to select the first arrangement of the charge pump cells or the second arrangement of the charge pump cells. The charge pump array is configured to alter a voltage level of a signal based, at least in part, on the selected arrangement of the charge pump cells.

A power supply monitoring circuit is provided that utilises an adaptive internal control of the refresh rates of capacitors to reduce the power requirements of the circuit. The circuit provides at an output a signal indicative of the level of the supply voltage relative to a predetermined reference voltage.

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Whitechurch, Ireland

Daniel O'Keeffe