2.375V to 5.25V, 4-Wire Touch-Screen Controller
with Internal Reference and Temperature Sensor
VDD
VDD
Y+
REF
Y+
+IN REF+
X+
12-BIT ADC
-IN REF-
Y-
GND
Figure 3. Single-Ended Y-Coordinate Measurement
+IN REF+
X+
12-BIT ADC
-IN REF-
Y-
GND
Figure 4. Ratiometric Y-Coordinate Measurement
TOUCH SCREEN
OPEN CIRCUIT
Y+
X+
Y-
ON
+VDD
100kΩ
PENIRQ
Figure 5. PENIRQ Functional Block Diagram
PENIRQ
ENABLE
12 ______________________________________________________________________________________