MASTER/SLAVE CONTROL OF TOUCH SENSING
First Claim
1. A method of synchronizing touch sensing operations of a master controller and a slave controller for joint operation of a touch sensing surface, the method comprising:
- transmitting a first clock signal from the master controller to the slave controller;
transmitting a set clock command from the master controller to the slave controller;
generating, in response to the set clock command, one or more slave clock signals in the slave controller based on the first clock signal, wherein the one or more slave clock signals are generated in a known phase relationship with one or more master clock signals of the master controller; and
performing touch sensing to detect touch on or near the touch sensing surface based on the one or more master clock signals and the one or more slave clock signals, wherein the master controller operates a first portion of the touch sensing surface, and the slave controller operates a second portion of the touch sensing surface.
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Abstract
Touch sensing can be accomplished using master/slave touch controllers that transmit drive signals to a touch surface and process sense signals including superpositions resulting from master/slave drive signals. The master/slave can drive and sense different sets of lines, respectively, of the touch surface. A communication link between master/slave can be established by transmitting a clock signal between master/slave, transmitting a command including sequence information to the slave, and initiating a communication sequence from the clock signal and sequence information. The slave can receive/transmit communications from/to the master during first/second portions of the communication sequence, respectively. Touch sensing operations can be synchronized between master/slave by transmitting a command including phase alignment information from master to slave, and generating slave clock signals based on the clock signal and the phase alignment information, such that sense signal processing by master clock signals are in-phase with sense signal processing by slave clock signals.
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Citations
24 Claims
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1. A method of synchronizing touch sensing operations of a master controller and a slave controller for joint operation of a touch sensing surface, the method comprising:
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transmitting a first clock signal from the master controller to the slave controller; transmitting a set clock command from the master controller to the slave controller; generating, in response to the set clock command, one or more slave clock signals in the slave controller based on the first clock signal, wherein the one or more slave clock signals are generated in a known phase relationship with one or more master clock signals of the master controller; and performing touch sensing to detect touch on or near the touch sensing surface based on the one or more master clock signals and the one or more slave clock signals, wherein the master controller operates a first portion of the touch sensing surface, and the slave controller operates a second portion of the touch sensing surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16)
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13. A system comprising:
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a master controller; and a slave controller coupled to the master controller; wherein the master controller is configured to; transmit a first clock signal from the master controller to the slave controller; and transmit a set clock command from the master controller to the slave controller; wherein the slave controller is configured to; generate, in response to the set clock command, one or more slave clock signals in the slave controller based on the first clock signal, wherein the one or more slave clock signals are generated in a known phase relationship with one or more master clock signals of the master controller; and wherein the master controller and slave controller are configured to synchronously perform touch sensing to detect touch on or near a touch sensing surface based on the one or more master clock signals and the one or more slave clock signals, wherein the master controller operates a first portion of the touch sensing surface, and the slave controller operates a second portion of the touch sensing surface. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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Specification