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US 2009/0021401 A1Published application
System and method for verifying entry of keystrokes received from a capacitive keypad
AssigneeEmerson Electric Co.
InventorsDoug Williams, Rick Helm, William Joseph Taylor, Robert M. Libbe
Life of this patent
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Abstract
A method for resetting a key decoder coupled to a plurality of capacitive keys to prevent processing of a key code generated by a ghosting condition. The method includes receiving a key code from a key decoder that corresponds to a first capacitive key of a capacitive keypad, detecting a ghosting condition for a second capacitive key that does not correspond to the detected key code, and resetting a key decoder in response to the ghosting condition being detected.
Claims20
A method of data entry for an appliance comprising:
- receiving a key code from a key decoder that corresponds to a first capacitive key of a capacitive keypad;
- detecting a ghosting condition for a second capacitive key that does not correspond to the detected key code;
- and
- resetting a key decoder in response to the ghosting condition being detected.
1 more element
A data entry system for use in an appliance, comprising:
- a key decoder coupled to a plurality of capacitive keys, the key decoder generates a code corresponding to a capacitive key transitioning to a capacitance indicative of a key being touched;
- a key selector coupled to the key decoder, the key selector for selecting a signal from at least one key in the plurality of capacitive keys that does not correspond to the key code received from the key decoder;
- a ghost condition detector being coupled to the signal selected by the key selector and being configured to detect a ghosting condition with reference to a ghosting threshold coupled to the ghost condition detector.
Dependencies are inferred from the claim text.