Active stylus to host data transmitting method
First Claim
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1. A method, comprising:
- receiving, at a stylus, an indication that a host device is performing a first coordinate scan to determine coordinates of the stylus proximate to a capacitive sense array of the host device;
wherein the first coordinate scan comprises a first scan of a first set of electrodes of the capacitive sense array and a second scan of a second set of electrodes of the capacitive sense array; and
while the host device is performing the first coordinate scan, transmitting at least two bits of stylus data to the host device, wherein said transmitting the at least two bits comprises;
transmitting a first bit of the at least two bits during the first scan; and
transmitting a second bit of the at least two bits during the second scan.
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Abstract
Apparatuses and methods of active stylus to host device data transmitting. One method receives, at a stylus, an indication that a host device is performing a first coordinate scan to determine coordinates of the stylus proximate to a capacitive sense array of the host device. While the host device is performing the first coordinate scan, the stylus transmits at least two bits of stylus data to the host device.
33 Citations
17 Claims
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1. A method, comprising:
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receiving, at a stylus, an indication that a host device is performing a first coordinate scan to determine coordinates of the stylus proximate to a capacitive sense array of the host device; wherein the first coordinate scan comprises a first scan of a first set of electrodes of the capacitive sense array and a second scan of a second set of electrodes of the capacitive sense array; and while the host device is performing the first coordinate scan, transmitting at least two bits of stylus data to the host device, wherein said transmitting the at least two bits comprises; transmitting a first bit of the at least two bits during the first scan; and transmitting a second bit of the at least two bits during the second scan. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system, comprising:
a stylus comprising; a tip driver; a receiver configured to receive indications of coordinate scans performed by a host device to determine coordinates of the stylus proximate to a capacitive sense array of the host device; and a processing device coupled to the receiver and the tip driver, wherein the processing device is configured to transmit at least two bits of stylus data per each of the coordinate scans performed by the host device; wherein the coordinate scans each comprises a first scan of a first set of electrodes of the capacitive sense array and a second scan of a second set of electrodes of the capacitive sense array, and wherein the processing device is configured to transmit a first bit of the at least two bits during the first scan and to transmit a second bit of the at least two bits during the second scan. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A stylus, comprising:
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a force sensor; a processing device coupled to the force sensor, wherein the processing device is configured to implement a stylus data state machine, wherein the stylus data state machine comprises a first state in which the force sensor is not pressed, a second state in which the force sensor is pressed, a third state in which the force sensor is still pressed, and a fourth state in which the force sensor is released; a receiver coupled to the processing device; and a tip driver coupled to the processing device, wherein the processing device is configured to receive indications via the receiver from a host device that the host device is performing coordinate scans of the stylus and to transmit two bits of stylus data per each of the coordinate scans via the tip driver in the respective one of the first state, second state, third state, and fourth state.
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Specification