Multi-stage stylus detection
First Claim
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1. An apparatus comprising:
- a sense array comprising a plurality of electrodes;
an analog-to-digital converter (ADC) coupled to the sense array and configured to receive signals from the sense array in a first mode and in a second mode; and
a processing device coupled to the sense array and to the ADC, the processing device configured at least to;
set the ADC to a first sampling frequency in the first mode;
and set the ADC to a second sampling frequency in the second mode.
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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.
28 Citations
22 Claims
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1. An apparatus comprising:
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a sense array comprising a plurality of electrodes; an analog-to-digital converter (ADC) coupled to the sense array and configured to receive signals from the sense array in a first mode and in a second mode; and a processing device coupled to the sense array and to the ADC, the processing device configured at least to; set the ADC to a first sampling frequency in the first mode; and set the ADC to a second sampling frequency in the second mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method comprising:
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setting an analog-to-digital converter (ADC) to a first sampling frequency in a first mode, wherein the ADC is coupled to a sense array that comprises a plurality of electrodes; receiving a first plurality of signals from the sense array in the first mode; setting the ADC to a second sampling frequency in a second mode; and receiving a second plurality of signals from the sense array in the second mode. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An apparatus comprising:
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an analog-to-digital converter (ADC) coupled to a sense array comprising a plurality of electrodes and configured to receive signals from the sense array in a first mode and in a second mode; and a processing device coupled to the sense array and to the ADC, the processing device configured at least to; set the ADC to a first sampling frequency in the first mode; and set the ADC to a second sampling frequency in the second mode, wherein the processing device is configured to conduct switching between the first mode and the second mode, each mode relating to a frequency of a transmission signal transmitted from a stylus detected through the sense array.
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22. An method comprising:
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setting an analog-to-digital converter (ADC) to a first sampling frequency in a first mode, wherein the ADC is coupled to a sense array that comprises a plurality of electrodes; receiving a first plurality of signals from the sense array in the first mode; setting the ADC to a second sampling frequency in a second mode; receiving a second plurality of signals from the sense array in the second mode; and switching between the first mode and the second mode, wherein the switching between the first mode and the second mode corresponds to a frequency of a transmission signal transmitted from a stylus detected through the sense array.
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Specification