Touch Screen Interface - LG KF700Q Service Manual

3. TECHNICAL BRIEF

3.12 Touch Screen Interface

The TSC2007 device has a 12-bit analog-to-digital resistive touch screen converter including drivers
and the control logic to measure touch pressure. The TSC2007 device is controlled by I2C port from
MSM6280.
Touch Screen interface scheme is shown in [Fig. 3.27]. and, there control signals are followed
❏ TOUCH_I2C_SCL : I2C CLOCK
❏ TOUCH_I2C_SDA : I2C DATA
❏ TOUCH_PENIRQ_N : DETECT
LGE Internal Use Only
[Fig. 3.27] Touch Screen Interface
C102
TOUCH_PENIRQ_N
X+
Y+
X-
Y-
[Fig. 3.28] Schematic of TOUCH SCREEN
- 68 -
VREG_LDO_TOUCH_2.8V
C103
1u 0.1u
U100 TSC2007IYZGR
A1 C1
AUX SDA
A2 C2
VDD_REF A1
A3 C3
X+ X-
B1 D1
PENIRQ- SCL
B2 D2
A0 GND
B3 D3
Y+ Y-
C104
0.1u
TOUCH SCREEN DRIVER IC
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
TOUCH_I2C_SDA
TOUCH_I2C_SCL