Patent application number | Description | Published |
20100283760 | METHOD AND APPARATUS FOR SCANNING A TOUCHSCREEN WITH MULTI-TOUCH DETECTION USING MASTER/SLAVE DEVICES - A touch panel scan system is disclosed for detecting a change in mutual capacitance on the surface of a touch panel. A first touch detect device is provided having a transmitter for transmitting a transmit signal to a select one of a plurality of first lines on a first edge of a touch panel to facilitate a single line scan operation. A second touch detect device is interfaced with a select one or ones of second lines on a second edge of the touch panel having a receiver for receiving therefrom and processing thereof transmit signals coupled thereto from the select one or ones of the first lines to detect changes in a mutual capacitance associated with the select one or ones of the second lines and the first line. At least one of the first or second touch detect devices functions as a master and the other functions as a slave, with the master coupled to the slave and generating a SYNC signal to initiate a single scan operation of a select one of the first lines. | 11-11-2010 |
20110156839 | CAPACITIVE SENSOR WITH VARIABLE CORNER FREQUENCY FILTER - A system and method for configuring a variable filter in a capacitive sensing circuit are provided. In one example, the circuit includes first and second circuitry and control logic. The first circuitry is configured to provide a variable resistance path that is coupled to an external capacitor that is to be sensed by the capacitive sensing circuit. The second circuitry controls actuation of the first circuitry and is responsive to a voltage change that occurs when a charge level of the external capacitor is altered. The second circuitry actuates the first circuitry when the voltage change causes a voltage supplied to the second circuitry to pass a predefined threshold. The control logic receives input identifying a desired corner frequency, determines a resistance setting for the first circuitry corresponding to the corner frequency, and applies the resistance setting to the first circuitry to configure the first circuitry at the corner frequency. | 06-30-2011 |
20110157068 | TOUCH SCREEN POWER-SAVING SCREEN SCANNING ALGORITHM - A method for detecting touch locations on a capacitive array includes the steps of scanning for at least one touch location on an entire capacitive array using a first sensing circuitry and detecting the at least one touch location with the first sensing circuitry. A smaller portion of the capacitive array is determined responsive to the detection of the at least one touch location. The at least one touch location is scanned only within smaller portion of the capacitive array using a second sensing circuitry. The at least one touch location is detected with the second sensing circuitry and output for use. | 06-30-2011 |
20110157070 | SYSTEM AND METHOD FOR CONFIGURING CAPACITIVE SENSING SPEED - A system and method for configuring capacitive sensing speed are provided. In one example, a circuit includes first and second circuitry and control logic. The first circuitry controls a first current provided to a reference capacitor having a known capacitance. The second circuitry controls a second current to an external capacitor having an unknown capacitance. The control logic is configured to receive input defining a period of time at which to set the charge time of the reference capacitor, control the first circuitry to provide a minimum amount of the first current needed to charge the reference capacitor within the defined period of time, and control the second circuitry to provide an amount of the second current needed to normalize the charge time of the external capacitor with the charge time of the reference capacitor. | 06-30-2011 |
20110157077 | CAPACITIVE SENSOR SYSTEM WITH NOISE REDUCTION - A system for reducing noise when detecting the capacitance value of a capacitor in a touch display that operates in a potentially noisy environment. A capacitance sensor is provided for determining the size of the capacitor in the touch screen display and includes a charging circuit that charges the capacitor and a discharge circuit that resets the charge of the capacitor to substantially zero. A control circuit controls the capacitance sensor and the operation of the charge and discharge circuits in accordance with a predetermined charging/discharging algorithm to resolve the value of the capacitor and output such value in a sampling operation. The operation of the control circuit and the charging/discharging algorithm is subject to errors as a function of the noisy environment, which errors will be reflected in the output value. A noise reduction circuit is provided to modify the operation of the control circuit to reduce noise. | 06-30-2011 |
20130222027 | INTEGRATED CIRCUIT, MICRO-CONTROLLER UNIT, AND METHOD INCLUDING A SYNCHRONOUS SAMPLING CONTROLLER - A micro-controller unit (MCU) includes an analog-to-digital converter (ADC) including an input, a timing input, and an output. The input of the ADC is configurable to couple to an output of a peripheral module. The MCU further includes a synchronous sampling controller configured to provide a clock signal to a clock output terminal configurable to couple to a clock input of the peripheral module. The synchronous sampling controller is further configured to provide a timing signal to the timing input of the ADC to synchronize sampling of a signal at the input of the ADC to timing of the peripheral module. | 08-29-2013 |
20130222165 | Integrated Circuit and System Including Current-Based Communication - An integrated circuit includes a current-based digital-to-analog converter (IDAC) including a clock input and including an output. The integrated circuit further includes a sample synchronization generator to provide a clock signal to a clock output terminal and a first timing signal related to the clock signal to the clock input of the IDAC. The sample synchronization generator controls the clock signal and the first timing signal to communicate a control signal to a peripheral module. | 08-29-2013 |
20130223507 | GENERATING PULSE WIDTH MODULATED SIGNALS - A technique includes using a first signal that is produced by a counter to generate a center-aligned pulse width modulation signal having a first time profile and using the first signal to concurrently generate a pulse width modulation signal that has a second time profile that is different from the first time profile. | 08-29-2013 |
20130227181 | Integrated Circuit, System, and Method Including a Shared Synchronization Bus - An integrated circuit includes a shared synchronization bus having a plurality of channels assigned to one or more of a plurality of peripheral modules. The integrated circuit further includes a first peripheral module of the plurality of peripheral modules including a control output coupled to the shared synchronization bus and configured to communicate event timing data to an input of a second peripheral module of the plurality of peripheral modules through a selected one of the plurality of channels. | 08-29-2013 |