Touch Panel Interface - Quectel SC200R Series Hardware Design

MIPI are high-speed signal lines. It is recommended to add common-mode filters in series near the LCM
connector, to improve protection against electromagnetic radiation interference.
It is recommended to read the LCM ID register through MIPI when compatible design with other displays
is required. If several LCMs share the same IC, it is recommended that the LCM factory should burn an
OTP register to distinguish different screens. You can also connect the LCD_ID pin of LCM to the ADC pin
of the module, but you need to make sure that the output voltage of LCD_ID should not exceed the
voltage range of the ADC pin.
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.
PWM
Module
Figure 20: Reference Design for External Backlight Driving Circuit

3.19. Touch Panel Interface

SC200R series module provides one I2C interface for connection with Touch Panel (TP), and also
provides the corresponding power supply and interrupt pins. The definitions of TP interface pins are
illustrated below.
Table 24: Pin Definition of Touch Panel Interface
Pin Name Pin No.
LDO17_2V85 129
LDO6_1V8 125
SC200R&SC262R_Series_Hardware_Design
VBAT
C1
2.2 μF
I/O Description
2.85 V output power supply for
PO
TP VDD
1.8 V output power supply for TP
PO I/O power domain and I2C
pull-up circuit
Backlight
driver
Comment
Vnom = 2.85 V
I max = 450 mA
O
Vnom = 1.8 V
I max = 150 mA
O
Smart Module Series
LCM_LED+
LCM_LED-
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