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TSC2200 Datasheet(PDF) 10 Page - Texas Instruments |
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TSC2200 Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 45 page  10 www.ti.com TSC2200 SBAS191F FIGURE 4. Simplified Diagram of the Analog Input Section. Converter –REF +REF +IN –IN V BAT1 AUX1 Battery On AUX2 GND 2.5V Reference Ref ON/OFF X+ X– +V DD TEMP1 Y+ Y– V REF TEMP0 7.5k Ω V BAT2 7.5k Ω 2.5k Ω Battery On 2.5k Ω In some applications, external capacitors may be required across the touch screen for filtering noise picked up by the touch screen; i.e., noise generated by the LCD panel or back-light circuitry. The value of these capacitors will provide a low-pass filter to reduce the noise, but will cause an additional settling time requirement when the panel is touched. Several solutions to this problem are available in the TSC2200. A programmable delay time is available that sets the delay between turning the drivers on and making a conversion. This is referred to as the Panel Voltage Stabilization time, and is used in some of the modes available in the TSC2200. In other modes, the TSC2200 can be commanded to turn on the drivers only without performing a conversion. Time can then be allowed before a conversion is started. The TSC2200 touch screen interface can measure position (X and Y) and pressure (Z). Determination of these coordinates is possible under three different modes of the A/D converter: conversion controlled by the TSC2200, initiated by detection of a touch; conversion controlled by the TSC2200, initiated by the host responding to the PENIRQ signal; or conversion completely controlled by the host processor. A/D CONVERTER The analog inputs of the TSC2200 are shown in Figure 4. The analog inputs (X, Y, and Z touch panel coordinates, battery voltage monitors, chip temperature, and auxiliary inputs) are provided via a multiplexer to the Successive Approximation Register (SAR) A/D converter. The A/D converter architecture is based on capacitive redistribution architecture that inher- ently includes a sample-and-hold function. |
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