Touch Screen Interface - LG KF690 Service Manual

3.11 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
ESM6270.
Touch Screen interface scheme is shown in [Fig. 3.29]and, there control signals are followed
❏ TOUCH_I2C_SCL : I2C CLOCK
❏ TOUCH_I2C_SDA : I2C DATA
❏ TOUCH_PENIRQ_N : DETECT
ESM6270
[Fig. 3.30] Touch Screen Driver IC schematic & ESM6270 interface
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
[Fig. 3.29] Touch Screen Interface
VREG_TOUCH_2.8V
C102 C103
1u 0.1u
TOUCH_PENIRQ_N
X+
Y+
X-
Y-
- 59 -
3. TECHNICAL BRIEF
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
TOUCH_I2C_SDA
TOUCH_I2C_SCL
LGE Internal Use Only