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US 2019/0102037 A1Published application
MULTl-POWER DOMAIN TOUCH SENSING
AssigneeApple Inc.
InventorChristoph H. KRAH
Life of this patent
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AssigneeApple Inc.
InventorChristoph H. KRAH
Estimating the term…
The disclosure relates to a touch and/or proximity detection system having some components operating in the guard domain and other components operating in the earth or chassis ground domain. A guard chip in the earth or chassis ground domain can include a voltage driver configured to produce a guard signal, for example. In some examples, the guard signal can be coupled to one or more shielding electrodes of a touch screen and to the ground pin of one or more touch sensing chips of the touch and/or proximity detection system. In this way, for example, the touch sensing chips, which can include sense amplifiers coupled to one or more sensing electrodes of the touch screen, can operate in the guard domain. In some examples, the guard chip can further include differential amplifiers and/or ADCs, allowing these components to operate in the earth or chassis ground domain.
An electronic device comprising:
A method of touch sensing with an electronic device including a first chip operating in a first power domain referenced to a first voltage and a second chip operating in a second power domain referenced to a second voltage, the method comprising:
A non-transitory computer readable storage medium storing instructions, which when executed by an electronic device including a first chip operating in a first power domain referenced to a first voltage, a second chip operating in a second power domain referenced to a second voltage and one or more processors, cause the one or more processors to perform a method comprising:
Dependencies are inferred from the claim text.