UCB1300BE 데이터 시트보기 (PDF) - Philips Electronics

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UCB1300BE

Advanced modem/audio analog front-end

Philips Electronics 

Philips Semiconductors

Advanced modem/audio analog front-end

Preliminary specification

UCB1300

TOUCH SCREEN MEASUREMENT MODES

The UCB1300 contains an on chip interface for a 4 wire resistive touch screen. This interface supports three modes of

touch screen measurements: position, pressure and plate resistance.

POSITION MEASUREMENT

Two position measurements are needed to determine the location of the pressed spot. First an X measurement, secondly

a Y measurement. The X plate is biased during the X position measurement of the X plate and the voltage on one or both

Y terminals (TSPY, TSMY) measured. The circuit can then be represented by a potentiometer, with the TSPY and/or

TSMY electrode being the ‘wiper’. The measured voltage on the TSPY/TSMY terminal is proportional to the X position

of the pressed spot of the touch screen.

Vposition

Vtscbias

tspx

tsmy

tspy

tsmx

Fig.8 Touch screen setup for position measurement.

In the Y position mode the X plate and Y plate terminals are interchanged, thus the Y plate is biased while the voltage

on the TSPX and/or TSMX terminal is measured.

1999 Jul 20

14

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