Multi modal touch controller
AssigneeApple Inc.
InventorChristoph H. KRAH
Life of this patent
Estimating the term…
Abstract
A multi-modal touch controller configured to operate in different modes. In some examples, the multi-modal touch controller can be operated in a first mode corresponding to a guarded self-capacitance scan. In some examples, the multi-modal touch controller can be operated in a second mode corresponding to offset-compensated mutual capacitance scan. In some examples, the multi-modal controller can be operated in a third mode corresponding to a mutual and self-capacitance scan. The multi-modal touch controller can advantageously allow one touch sensing chipset to be used across different types of guarded touch sensor panels and across different modes of operation.
Claims25
A touch sensing system comprising:
- a first chip operating in a first power domain referenced to a first voltage, the first chip configured to generate a first signal in a first mode and a second signal in a second mode, the first signal different than the second signal;
- and
- a second chip configurable to operate in a second power domain referenced to the first signal in the first mode and to operate in the first power domain referenced to the first voltage in the second mode, the second chip including touch sensing circuitry configured to sense touch at one or more touch nodes of a touch sensor panel.
A method of touch sensing in a touch sensing system including a multi-modal touch controller comprising a first chip operating in a first power domain referenced to a first voltage and a second chip, the method comprising:
- determining a touch sensing mode;
- in accordance with a determination that the touch sensing mode is a first mode, operating the second chip in a second power domain referenced to a first signal generated in the first chip;
- and
- in accordance with a determination that the touch sensing mode is a second mode, operating the second chip in the first power domain referenced to the first voltage.
A non-transitory computer readable storage medium storing instructions, which when executed by one or more processors of a touch sensing system including a multi-modal touch controller comprising a first chip operating in a first power domain referenced to a first voltage and a second chip, cause the one or more processors to perform a method comprising:
- determining a touch sensing mode;
- in accordance with a determination that the touch sensing mode is a first mode, operating the second chip in a second power domain referenced to a first signal generated in the first chip;
- and
- in accordance with a determination that the touch sensing mode is a second mode, operating the second chip in the first power domain referenced to the first voltage.
Dependencies are inferred from the claim text.