Touch Screen Interface; Only For Training And Service Purposes - LG U990 Service Manual

3.13 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 Figure.
And, there control signals are followed
• TOUCH_I2C_SCL : I2C CLOCK
• TOUCH_I2C_SDA : I2C DATA
• TOUCH_PENIRQ_N : DETECT
Copyright © 2007 LG Electronics. Inc. All right reserved.

Only for training and service purposes

Figure. Touch Screen Interface
LCD_VDD_2.8V
C700 C701
1u 0.1u
TOUCH_PENIRQ_N
X+
Y+
X-
Y-
- 85 -
3. TECHNICAL BRIEF
U700 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-
LGE Internal Use Only
TOUCH_I2C_SDA
TOUCH_I2C_SCL