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LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. TECHNICAL DESCRIPTION
3.1.15 Touch Screen
When Touch button and Touch screen is touched, Interrupt is given to DB3200 than, it read the status
register what coordinate is touched by I2C. I2C is realize by DB3200 GPIO..
Figure 3-1-15. Touch screen schematics
EUSY0337101
TOUCH SCREEN DRIVER IC
RSB6.8CST2RZD402
ZD403 RSB6.8CST2R
B2
A0
A1
C2
A1
AUX
GND
D2
PENIRQ-
B1 D1
SCL
C1
SDA
VDD_REF
A2
A3
X+
C3
X-
Y+
B3 D3
Y-
TSC2007IYZGRU405
ZD401 RSB6.8CST2R
VDD_TOUCH_2V8
DNI R424
2.7KR422
R420
0
0.1u
C412
R421 2.7K
C411
1u
RSB6.8CST2RZD400
TOUCH_Y+
TOUCH_X-
TOUCH_Y-
APP_GP_TOUCH_PENIRQn_2V75 APP_GP_TOUCH_SCL_2V75
APP_GP_TOUCH_SDA_2V75
TOUCH_X+
TOUCH LEVEL SHIFTER
R425
51K
0R423
VDD_TOUCH_2V8
VDDE_1V8
R426 0
C3
B4
C4
B4
GND
B3
OE
VCCA
B2
B1
VCCB
U404
TXS0104EZXUR
A1
A1
A2
A2
A3
A3
A4
A4
C1
B1
C2
B2
B3
0
R642
APP_GP_TOUCH_SDA
APP_GP_TOUCH_SCL
APP_GP_TOUCH_SCL_2V75
APP_GP_TOUCH_PENIRQn
APP_GP_TOUCH_SDA_2V75
APP_GP_TOUCH_PENIRQn_2V75
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