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It is recommended to read the LCM ID register through MIPI when compatible design with other displays
is required. If several LCM models share the same IC, it is recommended that the LCM module factory
burn the OTP register to distinguish different screens. You can also connect the LCD_ID pin of LCM to
GPIO pin of the module and distinguish different factory through level detection.
You can design the external backlight driving circuit for LCM according to actual requirements. A
reference circuit design is shown in the following figure, in which the PWM pin is used to adjust the
backlight brightness.
Module
Figure 21: Reference Design of LCM External Backlight Driving Circuit
3.17. Touch Panel Interface
The module provides one I2C interface 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 22: Pin Definition of Touch Panel Interface
Pin Name
Pin No.
LDO4_2V8
156
LDO2_1V8
125
TP_INT
30
SC200L_Series(Dual-band Wi-Fi)_Hardware_Design
VBAT
PWM
2.2 μF
GND
I/O
Description
2.80 V output power
PO
supply for TP VDD
1.8 V output power
PO
supply for TP I/O
power
DI
TP interrupt
Backlight
driver
C1
Smart Module Series
LCM_LED+
LCM_LED-
Comment
Vnom = 2.80 V
I
max = 200 mA
O
Vnom = 1.80 V
I
max = 200 mA
O
1.85 V power domain.
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