Smart LTE Module Series
SC600Y&SC600T Hardware Design
SC600Y&SC600T_Hardware_Design 70 / 128
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Power two strings of WLEDs (about 16 WLEDs) with two current sink drivers, or power four strings of
WLEDs (about 28 WLEDs) with four current sink drivers.
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The frequency of PWM can be configured by software to adjust the backlight brightness.
LCM0 uses the internal backlight driving circuit provided by SC600Y&SC600T by default. LCM1 can use
the internal circuit or an external backlight driving circuit according to customers’ demands. The following
is a reference design for LCM1 external backlight driving circuit where PMU_MPP4 is used to adjust the
backlight brightness.
152
L
PMU_MPP4
Module
2.2uF
Backlight
Driver
LCM1_LED-
VBAT
C1
Figure 22: Reference Design of LCM1 External Backlight Driving Circuit
3.20. Touch Panel Interfaces
SC600Y&SC600T provide two I2C interfaces for connection with Touch Panel (TP), and also provides the
corresponding power supply and interrupt pins. The pin definition of touch panel interfaces is illustrated
below.
Table 23: Pin Definition of Touch Panel Interfaces
Pin Name
Pin No
I/O
Description
Comment
LDO10_2P8
11
PO
2.8V output power supply for TP
VDD power
Vnorm=2.8V
I
O
max=150mA
LDO6_1P8
10
PO
1.8V output power supply
Pull-up power supply of I2C
Vnorm=1.8V
I
O
max=300mA
TP0_INT
139
DI
Interrupt signal of touch panel (TP0)
TP0_RST
138
DO
Reset signal of touch panel (TP0)
Active low
TP0_I2C_
SCL
140
OD
I2C clock signal of touch panel
(TP0)