Product Info

Smart Wi-Fi Module Series
SC20-WL Hardware Design
SC20-WL_Hardware_Design 50 / 81
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LCM_LED+
PWM
Module
2.2uF
Backlight
driving
circuit
LCM_LED-
VBAT
C1
Figure 20: Reference Design for Backlight Dirving Circuit
3.18. Touch Panel Interface
SC20-WL provides a set of I2C interface for connection with Touch Panel (TP), and also provides the
corresponding power supply and interrupt pins. The definition of TP interface pins is illustrated below.
Table 17: Pin Definition of Touch Panel Interface
Pin Name
Pin No
I/O
Description
Comment
LDO6_1V8
125
PO
1.8V output power supply for
TP I/O power
Pull-up power supply of I2C.
1.8V normal voltage.
LDO17_2V85
129
PO
2.85V output power supply for
TP VDD power
TP power supply.
2.85V normal voltage.
TP_INT
30
DI
Interrupt signal of TP
TP_RST
31
DO
Reset signal of TP
Active low
TP_I2C_SCL
47
OD
I2C clock signal of TP
TP_I2C_SDA
48
OD
I2C data signal of TP