SINGLE-CHIP MULTI-STIMULUS SENSOR CONTROLLER
First Claim
1. An apparatus for transmitting a plurality of drive signals simultaneously to a sensor, the apparatus comprising:
- transmit logic that generates one or more signals;
a bus that receives the one or more bus signals from the transmit logic;
one or more-multiplexers (MUXs) connected to the-bus, each MUX selecting one of a plurality of bus signals for transmission to the sensor as a drive signal, wherein the bus signals include the one or more signals from the transmit logic;
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Abstract
A multi-stimulus controller for a multi-touch sensor is formed on a single integrated circuit (single-chip). The multi-stimulus controller includes a transmit oscillator, a transmit signal section that generates a plurality of drive signals based on a frequency of the transmit oscillator, a plurality of transmit channels that transmit the drive signals simultaneously to drive the multi-touch sensor, a receive channel that receives a sense signal resulting from the driving of the multi-touch sensor, a receive oscillator, and a demodulation section that demodulates the received sense signal based on a frequency of the receive oscillator to obtain sensing results, the demodulation section including a demodulator and a vector operator.
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Citations
16 Claims
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1. An apparatus for transmitting a plurality of drive signals simultaneously to a sensor, the apparatus comprising:
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transmit logic that generates one or more signals; a bus that receives the one or more bus signals from the transmit logic; one or more-multiplexers (MUXs) connected to the-bus, each MUX selecting one of a plurality of bus signals for transmission to the sensor as a drive signal, wherein the bus signals include the one or more signals from the transmit logic; - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for obtaining a plurality of measurement data in a single sense signal, the apparatus comprising:
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a transmitter that generates analog drive signals via a digital-to-analog converter (DAC) and transmits the drive signals simultaneously to a sensor, wherein the sensor generates the sense signal in response to the drive signals, the sense signal including the plurality of measurement data; a receiver that receives the sense signal and converts the sense signal to a digital signal via an analog-to-digital converter (ADC) that operates at a sampling rate that is less than an update rate of the DAC; and a decoder that decodes the sense signal to obtain the plurality of measurement data. - View Dependent Claims (8, 9)
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10. An apparatus for transmitting a plurality of drive signals simultaneously to a sensor, the apparatus comprising:
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transmit logic that generates one or more digital signals; a digital-to-analog converter (DAC) that converts the one or more digital signals into one or more analog signals; an analog bus that receives the one or more analog signals from the DAC; a plurality of analog multiplexers (MUXs) connected to the analog bus, each MUX selecting one of a plurality of bus signals of the analog bus for transmission to the sensor as a drive signal, wherein the bus signals include the one or more analog signals from the DAC; and a plurality of analog output buffers connected to the MUXs, that buffer the selected drive signals for transmission to the sensor. - View Dependent Claims (11, 12, 14, 15, 16)
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13. The apparatus of claim 30, wherein the bus signals include at least one of a common voltage signal, the common voltage signal being a direct current (DC) signal, and a ground (GND).
Specification