Quectel SC20 Series Hardware Design page 58

MIPI are high speed signal lines. It is recommended that common-mode filters should be added in series
near the LCM connector, to improve protection against electromagnetic radiation interference.
ICMEF112P900MFR from ICT is recommended.
When compatible design with other displays is required, connect the LCD_ID pin of LCM to the module's
ADC pin, and please note that the output voltage of LCD_ID cannot exceed the voltage range of ADC pin.
External backlight driving circuit needs to be designed for LCM, and a reference circuit design is shown in
the following figure. Backlight brightness adjustment can be realized by PWM pin of SC20 series by
adjusting the duty ratio.
Module
Figure 22: Reference Design for External Backlight Driving Circuit
SC20_Series_Hardware_Design
Figure 21: Reference Circuit Design for LCM Interface
VBAT
Pin 29
PWM
Backlight
driving
circuit
C1
2.2 μF
Smart Module Series
LCM_LED+
LCM_LED-
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