Quectel SG560D Series - Page 77

Smart Module Series
SG560D_Series_Hardware_Design 76 / 134
The following figure shows a reference design for LCM interface.
DSI_CLK_P
LEDA
NC
LEDK
LPTE
NC (SDA-TP)
VIO18
NC (VTP-TP)
DSI_LN3_P
LCD_TE
LCD_RST
DSI_LN3_N
DSI_LN2_P
_CLK_N
DSI_LN2_N
RESET
LCD_ID
NC (SCL-TP)
NC (RST-TP)
NC (EINT-TP)
GND
VCC28
GND
MIPI_TDP3
MIPI_TDN3
GND
MIPI_TDP2
MIPI_TDN2
GND
MIPI_TDP1
MIPI_TDN1
GND
LDO13C_2V8 LDO17B_1V8
LCM _ LED+
LCM _LED-
1
2
3
4
5
6
7
8
9
10
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
MIPI_TDP0
MIPI_TDN0
GND
MIPI_TCP
MIPI_TCN
29
28
30
3
4
5 6
3
4
5 6
3
4
5 6
3
4
5 6
DSI_LN1_N
DSI_LN1_P
DSI_LN0_N
DSI_LN0_P
1
2
3
4
5 6
11
1
2
1
2
1
2
1
2
100
nF
1 μF
1 μF
Module
LCM
FL1
FL2
FL3
FL4
FL5
EMI filter
C 3
C2C1
NC
GND
GND
GND
GND
ADC
31
32
33
34
DSI
GND
NM_0R
LDO12C_1V8
0R
R 1
R 2
NM_0R
Figure 20: Reference Circuit for LCM Interface
MIPI are high speed signal traces. 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 module 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 note that the output voltage of LCD_ID should not exceed the voltage range of
the ADC pin.
You can design external backlight driver circuit for LCM according to actual requirement. The reference
design is shown in the figure below, in which PWM1 is used for backlight brightness adjustment.