Smart Machine Smart Decision
SIM5800_Hardware Design_V1.01
32
2018-10-08
Figure 23: SD card reference circuit
4.9
LCD interface
SIM500 support LCM display with 3-lane MIPI interface, there is LCM_ID for different LCM compatible design.
The landscape or portrait panel resolution is up to qHD (1280*800). The LCM interface is in the following table.
MIPI differential impedance should be 100Ohm when routing.
MIPI voltage is 1.8V, ADC could be used as LCM_ID for different LCM compatible design. The interface
definition is in the following table.
Table 9: LCM interface pin definitions
MIPI is a high-speed signal line. In order to avoid EMI interference, it is recommended to place the common
mode inductance on the side near LCM. If the LCM only needs 2-lane, the LANE2 can be suspended. Reference
circuit:
Name
Pin
I/O
Description
PWM
29
O
PWM control for external WLED driver
LCD_RST
49
O
LCM reset
LCD_TE
50
I
LCM frame alignment signal
MIPI_DSI_CLKN
52
O
LCM MIPI clock
MIPI_DSI_CLKP
53
O
MIPI_DSI_L0N
54
O
LCM MIPI signal
MIPI_DSI_L0P
55
O
MIPI_DSI_L1N
56
O
MIPI_DSI_L1P
57
O
MIPI_DSI_L2N
58
O
MIPI_DSI_L2P
59
O
ADC
128
AI
LCM ID
VIO18_PMU
125
O
Power supply
VIO28_PMU
129
O
Power supply