Smart Module Series
SC690A_Series_Hardware_Design 59 / 105
You can design external backlight drive circuit for LCM according to actual requirement. The reference
designs are shown in the figures below, in which PWM is used for backlight brightness adjustment.
LCD_BL_A
Module
Backlight
Driver
VPH_PWR
C1
PWM
GND
LCD_BL_K1
LCD_BL_K2
Figure 18: LCM External Backlight Driver Reference Circuit
4.10. Touch Panel Interface
The module provides one I2C interface for connection with touch panel (TP), and provides the
corresponding power supply and interrupt pins. The pin definition of touch panel interfaces is illustrated
below.
Table 22: Pin Definition of Touch Panel Interfaces
LCM is powered by LCD_VDD_2V8, which is an external LDO power supply.
Pin Name
Pin No.
I/O
Description
Comment
TP_RST
138
DO
TP reset
1.8 V power domain.
TP_INT
139
DI
TP interrupt
TP_I2C_SCL
140
OD
TP I2C clock
TP_I2C_SDA
206
OD
TP I2C data
NOTE
