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Analog Touch Screen Interface
EP93xx User's Guide
TOUCH DETECT
SW28
100K
SW22
100K
SW23
25
SW19
SW11
SW20
SW13
SW21
SW0
X+
SW1
X-
Y+
SW2
Y-
SW3
SW12
SW14
SW4
SW5
SW6
SW7
SW24
SW25
Not
SW26
used
SW27
SW15
SW16
SW17
SW18
25-6
DISCHARGE ALL LINES
TOUCH_PRESS
SW29
DAC
VDD
VBAT
100K
SW22
SW8
100K
SW23
SW30
SW19
SW11
SW20
SW13
A/D CONVERTER
SW21
SW0
IN
X+
SW1
X-
Y+
SW2
Y-
SW3
SW12
SW14
SW4
SW5
SW9
SW6
SW7
SW24
REF+
SW25
Not
SW26
used
SW27
REF-
SW15
SW16
SW10
SW17
SW18
Figure 25-3. 4-Wire Analog Resistive Interface Switching Diagram
Copyright 2007 Cirrus Logic
SAMPLE X-AXIS
VDD
100K
SW22
100K
SW23
SW19
SW11
SW20
SW13
A/D CONVERTER
SW21
SW0
IN
X+
SW1
X-
Y+
SW2
Y-
SW3
SW12
SW14
SW4
SW5
SW9
SW6
SW7
SW24
REF+
SW25
not
SW26
used
SW27
REF-
SW15
SW16
SW10
SW17
SW18
SAMPLE Y-AXIS
VDD
100K
SW22
100K
SW23
SW19
SW11
SW20
SW13
A/D CONVERTER
SW21
SW0
IN
X+
SW1
X-
Y+
SW2
Y-
SW3
SW12
SW14
SW4
SW5
SW9
SW6
SW7
SW24
REF+
SW25
not
SW26
used
SW27
REF-
SW15
SW16
SW10
SW17
SW18
VDD
A/D CONVERTER
IN
SW9
REF+
REF-
SW10
DS785UM1
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