LG KE990 Service Manual - Page 72

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 ESM6270. 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 EMSSMM66227800 TOUCH_PENIRQ_N TOUCH_I2C_SDA TOUCH_I2C_SCL TSC2007 X+ Y+ X- TOUCH CONNECTOR Y- F7 GPIO39 F14 GPIO64 F4 UART2_RFR_N_GPIO91 TP200 G6 UART2_CTS_N_GPIO90 E4 UART2_DP_TX_DATA_GPIO88 L23 UART3_CTS_N_GPIO86 M21 M19 UART3_DP_RX_DATA_GPIO85 UART3_DP_TX_DATA_GPIO84 D6 Figure. Touch Screen Interface LCD_VDD_2.8V R700 0 NA R702 C700 1u C701 0.1u TOUCH_PENIRQ_N X+ Y+ XY- U700 TSC2007IYZGR A1 A2 AUX A3 VDD_REF B1 X+ B2 PENIRQ- B3 A0 Y+ SDA C1 A1 C2 C3 X- D1 SCL D2 GND D3 Y- 2.7K R703 2.7K R704 TOUCH_I2C_SDA TOUCH_I2C_SCL EVLC14S02050 EVLC14S02050 EVLC14S02050 EVLC14S02050 TOUCH_PENIRQ_N CAM_MODE2_N USIM_CLK USIM_RST_N USIM_DATA TOUCH_I2C_SCL TOUCH_I2C_SDA VA709 VA710 VA711 VA712 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes - 73 - LGE Internal Use Only