DMC TSC-30/IC Bedienungsanleitung PDF herunterladen (Seite 4)

TSC-34/RU User’s Guide

1-3. Peripheral Composition Overview

A resistive touch screen is operated by resistance sensitive system between two layers such as film or

glass. Two pieces of transparent materials with conductive coating are placed in the same direction as

two electrodes face each other. The touch screen is activated when these transparent conductive layers

are pressed to contact each other with a finger or a pen. The one of these conductive layers functions as

an X-coordinates electric circuits and the other as a Y-coordinates circuits. To measure the

X-coordinates TSC-34/RU supplies voltage, Vcc to the one of X-coordinates electrodes with GND to the

other. When the touch screen is pressed under this environment the voltage of the X-coordinates re-

sistance is detected by the Y-coordinates electrode (A_in) at the input point (x1), where the X-Y coordinate

resistance layers make contact. The detected voltage in supply side is higher than the GND side, which

means ‘A_in’=Vcc at the point ‘E’ and ‘A_in’=0(*1) at the point ‘A’. TSC-34/RU calculates coordinates

data starting from A/D conversion of the ‘A_in’ voltage. The Y-coordinates is measured in the same way.

By repeating this process alternately, coordinate value at the input point is determined.

(*1) Excluding the loss in the controller circuits and touch screen. Actual detected voltage should be low-

er than ‘Vcc - GND’ because of loss happened in the circuitry.

A_in

Output Data

0000h (Min.)

1.25V

00FFh

2.5V

01FFh

3.75V

02FFh

03FFh (Max.)

Vcc

= 5.0V

A_in

X-resistive-layer

Y-resistive-layer

Touch

Vcc

(TSC-30/IC)

(Touch Screen)

(TSC-34/RU)

(RS-232C/USB)

To host

Y-resistive-layer

X-resistive-layer (reverse side)

X electrode

(reverse side)

Y electrode

Vcc

A_in

1 2 3 4 5 6 7 8 9 ... 12 13

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