11
LCD PANEL CONNECTION CIRCUIT
S5U1C17801T1100 HARDWARE MANUAL
EPSON
33
(SOFTWARE EVALUATION TOOL FOR S1C17801)
Touch Panel Controller Connection Circuit
The touch panel function is installed in the LCD panel module on the SVT
17801
. The following shows how the
touch panel is connected to the S
1
C
17801
.
V
DD
S1C17801
P33
P34
AIN5
AIN6
6
5
4
1
2
3
U102
74LVC2G14
C110
0.1µF
1Y
V
CC
2Y
1A
GND
2A
C109
470P
C108
470P
Q104
UNR5213
Q102
UNR5213
Q101
UNR31A300L
Q103
UNR31A300L
LEFT
TOP
RIGHT
BOTTOM
LCD panel module
(EW32F92FLWP)
V
DD
Fig.
11
.
1
.
1
Touch Panel Connection Circuit
In the above connection diagram (figure
11
.
1
.
1
), panel
ʼ
s touch position information entered from AIN
5
/AIN
6
is ob-
tained as an AD value while the circuit shown above is controlled by P
33
/P
34
of the S
1
C
17801
. The following lists
each signal status of the panel module and the S
1
C
17801
.
Table
11
.
1
.
1
Function of Touch Panel Control Signal
Pin No.
X-axis
Y-axis
S
1
C
17801
P
33
LOW
HIGH
P
34
HIGH
LOW
AIN
5
LOW
0
to V
DD
(V)
AIN
6
0
to V
DD
(V)
LOW
LCD panel module
LEFT
HIGH
Hi-Z
TOP
Hi-Z
HIGH
RIGHT
LOW
0
to V
DD
(V)
BOTTOM
0
to V
DD
(V)
LOW
In order to obtain panel
ʼ
s touch position information on X-axis of the figure
11
.
1
.
2
, an AD value obtained from
AIN
6
is used to determine the position of X-axis when P
33
is turned LOW while P
34
HIGH as shown in X-axis
fields shown in the table
11
.
1
.
1
. (The AIN
6
value becomes gradually larger for the left side of the figure
11
.
1
.
2
.)
On the other hand, to obtain panel
ʼ
s touch position information on the Y-axis of the figure
11
.
1
.
2
, an AD value ob-
tained from AIN
5
is used to determine the position of Y-axis when P
33
is turned HIGH while P
34
LOW as shown
in Y-axis fields of table
11
.
1
.
1
. (The AIN
6
value becomes gradually larger for the upper side of the figure
11
.
1
.
2
.)
This principle to obtain X-axis and Y-axis data helps acquire two-dimensional touch position information by obtain-
ing X-axis and Y-axis AD values while alternately switching between P
33
and P
34
statuses with a short duration.
AIN5 (Voltage HIGH)
AIN5 (Voltage LOW)
Y-axis
X-axis
AIN6 (Voltage HIGH)
AIN6 (Voltage LOW)
SVT17801 LCD BOARD
EPSON
Fig.
11
.
1
.
2
Image of X-axis and Y-axis Analog Values of Touch Panel
Summary of Contents for S5U1C17801T1100
Page 4: ......
