Multi-stage stylus detection
First Claim
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1. An apparatus comprising:
- a sense array comprising a plurality of electrodes, wherein the plurality of electrodes is configured to detect a stylus proximate to the sense array and a touch object proximate to the sense array; and
a processing device coupled to the sense array and configured to;
receive a first signal and a second signal from the sense array; and
process the first signal using a first set of sequences and the second signal using a second set of sequences to detect the stylus,wherein the processing device is coupled to an analog-to-digital converter (ADC) and wherein receiving the first and the second signals comprises;
setting the ADC to a first sampling frequency,receiving the first signal from the ADC,setting the ADC to a second sampling frequency, andreceiving the second signal from the ADC.
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Abstract
A system comprises a processing device and a capacitive sense array that includes a plurality of electrodes. The system receives a first signal from a first scan of electrodes in a capacitive sense array. The system processes the first signal using a first set of sequences to detect a stylus. The system receives a second scan from a second scan of electrodes in a capacitive sense array. The system processes the second signal using a second set of sequences to detect the stylus.
70 Citations
17 Claims
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1. An apparatus comprising:
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a sense array comprising a plurality of electrodes, wherein the plurality of electrodes is configured to detect a stylus proximate to the sense array and a touch object proximate to the sense array; and a processing device coupled to the sense array and configured to; receive a first signal and a second signal from the sense array; and process the first signal using a first set of sequences and the second signal using a second set of sequences to detect the stylus, wherein the processing device is coupled to an analog-to-digital converter (ADC) and wherein receiving the first and the second signals comprises; setting the ADC to a first sampling frequency, receiving the first signal from the ADC, setting the ADC to a second sampling frequency, and receiving the second signal from the ADC. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method comprising:
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setting an analog-to-digital converter (ADC) to a first sampling frequency, wherein the ADC is coupled to a processing device and a sense array; receiving a first signal by the processing device from the sense array via the ADC, the sense array comprising a plurality of electrodes, wherein the plurality of electrodes is configured to detect a stylus proximate to the sense array and a touch object proximate to the sense array; detecting a presence of the stylus based on the first signal and a first set of sequences; setting the ADC to a second frequency and receiving a second signal when the stylus is detected; and detecting the presence of the stylus based on the second signal and a second set of sequences. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification