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Module
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
LDO6_1V8
125
LDO17_2V85
129
TP_INT
30
TP_RST
31
TP_I2C_SCL
47
TP_I2C_SDA
48
SC20-WL_Hardware_Design
VBAT
29
PWM
2.2uF
I/O
Description
1.8V output power supply for
PO
TP I/O power
2.85V output power supply for
PO
TP VDD power
DI
Interrupt signal of TP
DO
Reset signal of TP
OD
I2C clock signal of TP
OD
I2C data signal of TP
Backlight
driving
circuit
C1
Smart Wi-Fi Module Series
SC20-WL Hardware Design
LCM_LED+
LCM_LED-
Comment
Pull-up power supply of I2C.
1.8V normal voltage.
TP power supply.
2.85V normal voltage.
Active low
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