2.375V to 5.25V, 4-Wire Touch-Screen

Controller

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11

PENIRQ

REF

A2–A0

SER/DFR

(SHOWN HIGH)

GND

X+

X-

Y+

Y-

CONVERTER

IN3

IN4

+REF

-REF

+IN

-IN

Figure 2. Equivalent Input Circuit

REF

GND

Y+

Y-

X+

REF+

REF-

+IN

-IN

12-BIT ADC

Figure 3. Single-Ended Y-Coordinate Measurement

GND

Y+

Y-

X+

REF+

REF-

+IN

-IN

12-BIT ADC

Figure 4. Ratiometric Y-Coordinate Measurement