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1. (WO2001033498) TOUCH SCREEN CONTROLLER

Pub. No.:    WO/2001/033498    International Application No.:    PCT/US2000/029573
Publication Date: Fri May 11 01:59:59 CEST 2001 International Filing Date: Sat Oct 28 01:59:59 CEST 2000
IPC: G06F 1/32
G06F 3/045
G06F 3/0488
Applicants: TEXAS INSTRUMENTS TUCSON CORPORATION
RUNDEL, Bernd, M.
Inventors: RUNDEL, Bernd, M.
Title: TOUCH SCREEN CONTROLLER
Abstract:
An improved touch screen controller including a comparator and an analog-to-digital converter. The comparator of the touch screen controller detects a touch of the touch screen while the analog-to-digital converter is powered down. The Data Out (DOUT) line of the touch screen controller is used to signal the microprocessor that a touch has occurred. The unique structure of the improved touch screen controller and the fast switching edges of the comparator output signal provide for a faster touch screen controller that consumes little power without requiring a dedicated pin for the touch signal.