Quectel Smart LTE Module Series Hardware Design page 66

DSI1_LN3_P
DSI1_LN3_N
DSI1_LN2_P
DSI1_LN2_N
DSI1_LN1_P
DSI1_LN1_N
DSI1_LN0_P
DSI1_LN0_N
DSI1_CLK_P
DSI1_CLK_N
Module
MIPI are high speed signal lines. It is recommended that common-mode filters should be added in series
near the LCM connector, so as to improve protection against electromagnetic radiation interference.
When compatible design with other displays is required, please 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.
The SC650T does not have an integrated backlight driver, and LCM requires an external backlight
driver.The reference circuit of external backlight drive is shown below, where the pin WLED_PWM
supports PWM output and can be used for backlight brightness adjustment.
Figure 21: Reference Design of LCM External Backlight Driving Circuit
SC650T_Hardware_Design
LCD_BIAS_P
LCD_BIAS_N
LCD1_TE
LCD1_RST
1
2
1
2
1
2
1
2
1
2
LCM _LED+
LCM _LED-
Figure 20: Reference Circuit Design for LCM1 Interface
VBAT
152
WLED_PWM
Module
LDO6_1P8
C1 C2
1 uF
1uF 1uF
10V
10V
FL1
3
4
FL2
3
4
FL3
3
4
FL4
3
4
FL5
3
4
EMI filter
Backlight
Driver
C1
2.2uF
Smart LTE Module Series
SC650T Hardware Design
1
LEDA
2
NC
3
LEDK
4
NC
5
LPTE
6
RESET
7
LCD_ID
8
NC (SDA-TP)
9
NC (SCL-TP)
C3
10
NC (RST-TP)
11
NC (EINT-TP)
12
GND
13
VIO18
14
VCC28
15
NC (VTP-TP)
16
GND
17
MIPI_TDP3
18
MIPI_TDN3
19
GND
20
MIPI_TDP2
21
MIPI_TDN2
22
GND
23
MIPI_TDP1
24
MIPI_TDN1
25
GND
26
MIPI_TDP0
27
MIPI_TDN0
28
GND
29
MIPI_TCP
30
MIPI_TCN
31
GND
32
LCM_LED+
33
GND
34
LCM_LED-
LCM
LCM_LED+
LCM_LED-
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