# US 2018/0321791 A1 · Channel scan logic > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0321791 A1 - Document ID: US20180321791A1 - Status: Published application - Kind: A1 - Application number: 16/039,216 - Filed: 2018-07-18 - Published: 2018-11-08 - Earliest claimed: 2007-01-03 - Assignees: Apple Inc. - Applicants: Apple Inc. - Inventors: Minh-Dieu Thi VU; Thomas James WILSON; Christoph H. KRAH - Web page: https://patentgrep.com/patent/US20180321791A1 ## CPC - G06F 3/0446: {using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes} - G06F 1/3262: {Power saving in digitizer or tablet} - G06F 3/03545: {Pens or stylus} - G06F 3/041: Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means - G06F 3/0416: {Control or interface arrangements specially adapted for digitisers} - G06F 3/04166: {Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving (Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184)} - G06F 3/044: by capacitive means - G06F 3/0445: {using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer} - G06F 2203/04104: Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract A device that can autonomously scan a sensor panel is disclosed. Autonomous scanning can be performed by implementing channel scan logic. In one embodiment, channel scan logic carries out many of the functions that a processor would normally undertake, including generating timing sequences and obtaining result data; comparing scan result data against a threshold value (e.g., in an auto-scan mode); generating row count; selecting one or more scanning frequency bands; power management control; and performing an auto-scan routine in a low power mode. ## Claims ### Claim 1 An electronic device, comprising: channel scan logic configurable for being coupled to an event-sensitive panel that provides one or more output signals indicative of an event condition on the panel; wherein the channel scan logic is further configurable to adjust a range of rows on the panel to be automatically scanned in a single low-power scan to detect an event condition substantially free of processor control. ### Claim 2 (depends on 1) The electronic device of claim 1, the channel scan logic further configurable for adjusting a number of timing sequences to be applied to each row being automatically scanned. ### Claim 3 (depends on 1) The electronic device of claim 1, the channel scan logic further configurable for adjusting a number of signal frequencies to be applied to each row being automatically scanned. ### Claim 4 (depends on 1) The electronic device of claim 1, the channel scan logic further configurable for adjusting an order of a number of signal frequencies to be applied to each row being automatically scanned. ### Claim 5 (depends on 1) The electronic device of claim 1, the channel scan logic further configurable to wake up a processor upon the detection of the event condition. ### Claim 6 (depends on 1) The electronic device of claim 1, the channel scan logic further configurable for autonomously scanning the range of rows on the panel by repeatedly stimulating the range of rows on the panel with an AC signal until a request is received from a processor to stop scanning. ### Claim 7 (depends on 1) The electronic device of claim 1, the channel scan logic further configurable for autonomously scanning one row of the range of rows on the panel by stimulating the one row with an AC signal and waiting to scan another row until a request is received from a processor to scan another row. ### Claim 8 (depends on 1) The electronic device of claim 1, the channel scan logic further configurable for autonomously scanning the range of rows on the panel with an AC signal in one frame and waiting to scan the range of rows in another frame until a request is received from a processor to scan another frame. ### Claim 9 A method of scanning an event sensitive panel, comprising: adjusting a range of rows on the panel to be automatically scanned in a single low-power scan to detect an event condition substantially free of processor control; autonomously scanning the range of rows on the panel for the event condition; detecting the event condition on the panel; and waking up a processor upon the detection of the event condition. ### Claim 10 (depends on 9) The method of claim 9, further comprising adjusting a number of timing sequences to be applied to each row being automatically scanned. ### Claim 11 (depends on 9) The method of claim 9, further comprising adjusting a number of signal frequencies to be applied to each row being automatically scanned. ### Claim 12 (depends on 9) The method of claim 9, further comprising adjusting an order of a number of signal frequencies to be applied to each row being automatically scanned. ### Claim 13 (depends on 9) The method of claim 9, further comprising autonomously scanning the range of rows on the panel by repeatedly stimulating the range of rows on the panel with an AC signal until a request is received from the processor to stop scanning. ### Claim 14 (depends on 9) The method of claim 9, further comprising autonomously scanning one row of the range of rows on the panel by stimulating the one row with an AC signal and waiting to scan another row until a request is received from the processor to scan another row. ### Claim 15 (depends on 9) The method of claim 9, further comprising autonomously scanning the range of rows on the panel with an AC signal in one frame and waiting to scan the range of rows in another frame until a request is received from the processor to scan another frame. ### Claim 16 A non-transitory computer-readable storage medium having stored thereon instructions which, when executed by a programmable electronic device, causes the electronic device to perform a method comprising: adjusting a range of rows on an event-sensitive panel to be automatically scanned in a single low-power scan to detect an event condition substantially free of processor control; autonomously scanning the range of rows on the panel for the event condition; detecting the event condition on the panel; and waking up a processor upon the detection of the event condition. ### Claim 17 (depends on 16) The non-transitory computer-readable storage medium of claim 16, the method further comprising adjusting a number of timing sequences to be applied to each row being automatically scanned. ### Claim 18 (depends on 16) The non-transitory computer-readable storage medium of claim 16, the method further comprising adjusting a number of timing sequences to be applied to each row being automatically scanned. ### Claim 19 (depends on 16) The non-transitory computer-readable storage medium of claim 16, the method further comprising adjusting a number of signal frequencies to be applied to each row being automatically scanned. ### Claim 20 (depends on 16) The non-transitory computer-readable storage medium of claim 16, the method further comprising adjusting an order of a number of signal frequencies to be applied to each row being automatically scanned.