Low power dissipation touch plane interface circuit
DCFirst Claim
1. A system that automatically configures a touch screen interface for one of a plurality of touch screen types, comprising:
- a first component that utilizes touch screen power signals to automatically determine a type of touch screen coupled to the interface, the first component comprising an analog-to-digital converter, an analog switch matrix, and at least one register; and
a second component that configures the interface by writing values associated with the touch screen type to memory accessible to the interface, the second component comprising a microprocessor.
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Abstract
A method of determining a type of touch plane operator input device comprises sensing the impedance across first and second terminals of a touch plane operator input device to distinguish the touch plane operator input device as being one of at least two different types of touch plane operator input devices. A method of processing an input from a touch plane operator input device comprises determining a first location of a first touch on the touch plane operator input device; determining a second location of a second touch on the touch plane operator input device; comparing the first and second locations to obtain an indication of an amount of difference between the first and second locations; and determining whether the indication of the amount of difference exceeds a predetermined amount. These steps are performed by discrete logic circuitry that provides an event notification to a microprocessor when the indication of the amount of difference exceeds the predetermined amount. An interface circuit for a touch plane operator input device comprises a digital signal processor that includes a data processing path along which data from a touch plane operator input device passes while being processed by the digital signal processor. The interface circuit is capable of processing data from first and second different types of touch plane operator input devices. The data path is a common data processing path that is the same for input data for both of the first and second types of touch plane operator input devices.
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Citations
20 Claims
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1. A system that automatically configures a touch screen interface for one of a plurality of touch screen types, comprising:
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a first component that utilizes touch screen power signals to automatically determine a type of touch screen coupled to the interface, the first component comprising an analog-to-digital converter, an analog switch matrix, and at least one register; and a second component that configures the interface by writing values associated with the touch screen type to memory accessible to the interface, the second component comprising a microprocessor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for automatically configuring a touch screen interface for a touch screen coupled to a device, comprising:
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sensing a touch screen is coupled to the interface; performing an analysis using information associated with a plurality of terminals of the touch screen; utilizing the analysis to determine a type of touch screen; and automatically configuring the interface for the type of touch screen. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A system that automatically configures a touch screen interface, comprising:
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means for sensing that a touch screen is coupled to the interface; means for determining a type of touch screen; and means for configuring the interface for the touch screen type.
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Specification