Abstract: This disclosure generally relates to repeaters, and, in particular, repeaters for open-drain systems. In one embodiment, an apparatus comprises a first port, a second port, a current detector, a transistor, and a control logic circuit. A current detector input of the current detector is coupled to the first port. A transistor channel electrode of the transistor is coupled to the second port. A control logic circuit input of the control logic circuit is coupled to the current detector output, and a control logic circuit output of the control logic circuit is coupled to a transistor control electrode of the transistor.

Abstract: This disclosure generally relates to repeaters, and, in particular, repeaters for open-drain systems. In one embodiment, an apparatus comprises a first port, a second port, a current detector, a transistor, and a control logic circuit. A current detector input of the current detector is coupled to the first port. A transistor channel electrode of the transistor is coupled to the second port. A control logic circuit input of the control logic circuit is coupled to the current detector output, and a control logic circuit output of the control logic circuit is coupled to a transistor control electrode of the transistor.

Abstract: This disclosure generally relates to repeaters, and, in particular, repeaters for open-drain systems. In one embodiment, an apparatus comprises a first port, a second port, a current detector, a transistor, and a control logic circuit. A current detector input of the current detector is coupled to the first port. A transistor channel electrode of the transistor is coupled to the second port. A control logic circuit input of the control logic circuit is coupled to the current detector output, and a control logic circuit output of the control logic circuit is coupled to a transistor control electrode of the transistor.

Abstract: This disclosure generally relates to repeaters, and, in particular, repeaters for open-drain systems. In one embodiment, an apparatus comprises a first port, a second port, a current detector, a transistor, and a control logic circuit. A current detector input of the current detector is coupled to the first port. A transistor channel electrode of the transistor is coupled to the second port. A control logic circuit input of the control logic circuit is coupled to the current detector output, and a control logic circuit output of the control logic circuit is coupled to a transistor control electrode of the transistor.

Abstract: This disclosure generally relates to repeaters, and, in particular, repeaters for open-drain systems. In one embodiment, an apparatus comprises a first port, a second port, a current detector, a transistor, and a control logic circuit. A current detector input of the current detector is coupled to the first port. A transistor channel electrode of the transistor is coupled to the second port. A control logic circuit input of the control logic circuit is coupled to the current detector output, and a control logic circuit output of the control logic circuit is coupled to a transistor control electrode of the transistor.

Abstract: This disclosure generally relates to repeaters, and, in particular, repeaters for open-drain systems. In one embodiment, an apparatus comprises a first port, a second port, a current detector, a transistor, and a control logic circuit. A current detector input of the current detector is coupled to the first port. A transistor channel electrode of the transistor is coupled to the second port. A control logic circuit input of the control logic circuit is coupled to the current detector output, and a control logic circuit output of the control logic circuit is coupled to a transistor control electrode of the transistor.

Abstract: Corruption of data in a FRAM (2) is avoided by applying a regulated voltage (VLDO) to a conductive pin (5-1). A switch (SW1) is coupled between the conductive pin and a power terminal of the FRAM so a FRAM supply voltage (VFRAM) is equal to the regulated voltage when the switch is closed. The conductive pin is coupled to a power terminal of a digital circuit (3) so a digital circuit supply voltage (VCORE) is equal to the regulated voltage. A power interruption is detected to produce an interruption signal (nBORdet) that opens the switch and also prevents starting of new read and write operations in the FRAM. A sufficient FRAM supply voltage is maintained by an internal capacitor (CINT) while ongoing read and write operations in the FRAM are completed during a predetermined interval. The conductive pin may be coupled to the switch by bonding wire inductance (LWIRE) between the switch and the conductive pin to inhibit flow of transient currents between them.

Abstract: A method for measuring for generating a touch capacitance measurement is provided. Gain and offset control signals are generated, where the gain and offset control signals are adjusted to compensate for base capacitance of a touch sensor. The gain control signal is applied to a touch sensor during a first phase of a clock signal, and the offset control signal is applied to an output circuit during a second phase of the clock signal. The output circuit is coupled to the touch sensor during the second phase of the clock signal. The touch capacitance measurement is generated by compensating for the base capacitance with the gain and offset control signals, and a gain is applied to the touch capacitance measurement.

Abstract: Corruption of data in a FRAM (2) is avoided by applying a regulated voltage (VLDO) to a conductive pin (5-1). A switch (SW1) is coupled between the conductive pin and a power terminal of the FRAM so a FRAM supply voltage (VFRAM) is equal to the regulated voltage when the switch is closed. The conductive pin is coupled to a power terminal of a digital circuit (3) so a digital circuit supply voltage (VCORE) is equal to the regulated voltage. A power interruption is detected to produce an interruption signal (nBORdet) that opens the switch and also prevents starting of new read and write operations in the FRAM. A sufficient FRAM supply voltage is maintained by an internal capacitor (CINT) while ongoing read and write operations in the FRAM are completed during a predetermined interval. The conductive pin may be coupled to the switch by bonding wire inductance (LWIRE) between the switch and the conductive pin to inhibit flow of transient currents between them.

Abstract: A method is provided. A first voltage is applied to a first set of column electrodes within a touch panel during a first interval, and a second voltage is applied to a second set of column electrodes within the touch panel during the first interval. The first and second sets of electrodes are adjacent to one another, and the second voltage has the opposite polarity of the first voltage. During the first interval, a first measurement signal is received from a set of row electrodes in the touch panel, and the first measurement signal is integrated to generate a first integrated signal. The first voltage is applied to the second set of column electrodes within the touch panel during a second interval, and the second voltage is applied to the first set of column electrodes within the touch panel during the second interval.

Abstract: A receiver is provided that has reduced power consumption and seldom operates erroneously. The receiver generally includes: an input circuit or photoreceptor that receives a modulated digital signal that can includes a preamble; a detector that detects the received digital signal and outputs a baseband signal; a comparator that compares baseband signal and a reference signal; an integration circuit that integrates baseband signal; hysteresis circuits that generates voltage signals based on an average value signal from integration circuit; a multiplexer that selects between the signals from the hysteresis circuits based on a digital output signal from comparator; and a pulse detection counter that counts the number of pulses of the digital signal from comparator and outputs a count signal to one of the hysteresis circuits.

Abstract: A method for measuring for generating a touch capacitance measurement is provided. Gain and offset control signals are generated, where the gain and offset control signals are adjusted to compensate for base capacitance of a touch sensor. The gain control signal is applied to a touch sensor during a first phase of a clock signal, and the offset control signal is applied to an output circuit during a second phase of the clock signal. The output circuit is coupled to the touch sensor during the second phase of the clock signal. The touch capacitance measurement is generated by compensating for the base capacitance with the gain and offset control signals, and a gain is applied to the touch capacitance measurement.

Abstract: A method is provided. A first voltage is applied to a first set of column electrodes within a touch panel during a first interval, and a second voltage is applied to a second set of column electrodes within the touch panel during the first interval. The first and second sets of electrodes are adjacent to one another, and the second voltage has the opposite polarity of the first voltage. During the first interval, a first measurement signal is received from a set of row electrodes in the touch panel, and the first measurement signal is integrated to generate a first integrated signal. The first voltage is applied to the second set of column electrodes within the touch panel during a second interval, and the second voltage is applied to the first set of column electrodes within the touch panel during the second interval.

Abstract: A particulate detector system is provided that can sense particulates (such as smoke in the air). The system employs a reflected light system that generally avoids making measurements of light intensity. Instead, coded signals are compared with one another to determine error rates between emitted light and detected light (across a chamber). Based on the error rate, processing circuitry can determine particulate concentration.

Abstract: A particulate detector system is provided that can sense particulates (such as smoke in the air). The system employs a reflected light system that generally avoids making measurements of light intensity. Instead, coded signals are compared with one another to determine error rates between emitted light and detected light (across a chamber). Based on the error rate, processing circuitry can determine particulate concentration.

Abstract: A receiver is provided that has reduced power consumption and seldom operates erroneously. The receiver generally includes: an input circuit or photoreceptor that receives a modulated digital signal that can includes a preamble; a detector that detects the received digital signal and outputs a baseband signal; a comparator that compares baseband signal and a reference signal; an integration circuit that integrates baseband signal; hysteresis circuits that generates voltage signals based on an average value signal from integration circuit; a multiplexer that selects between the signals from the hysteresis circuits based on a digital output signal from comparator; and a pulse detection counter that counts the number of pulses of the digital signal from comparator and outputs a count signal to one of the hysteresis circuits.