Sd Card; Table 8: Sd Interface - Sunsea AIoT SIMCom SIM5800 Hardware Design

VIO18_PMU
Note: When using the level isolation in Figure 21 and Figure 22, please pay attention to the output
sequential of VIO18_PMU. Only after VIO18_PMU is normally output, can the serial port communicate
normally.
4.8

SD card

Table 8: SD interface

Name
VMC_PMU
VMCH_PMU
SD_CLK
SD_CMD
SD_DATA0
SD_DATA1
SD_DATA2
SD_DATA3
SD_DET
Refer to the following application circuit:
VMC_PMU
Module
SD_DATA2
SD_DATA3
VMCH_PMU
SD_DATA0
SD_DATA1
VIO18_PMU
SIM5800_Hardware Design_V1.01
Smart Machine Smart Decision
VIO18_PMU
Module
4.7K
RXD
Figure 22: RX level converting by transistor
Pin I/O
32 O
38 O
39 O
40 I/O
41 I/O
42 I/O
43 I/O
44 I/O
45 I
1uF
SD_CMD
SD_CLK
33R
NM
SD_DET
1uF 33pF
Customer
VDD
4.7K
47K
TXD
Description
Pull up
Power supply
SDIO clock
SDIO command
SDIO data0
SDIO data1
SDIO data2
SDIO data3
SD card detection
TVS
C<15pF
31
SD card
1 DAT2
2 DAT3
3 CMD
4 VDD
5 CLK
6 VSS
7 DAT0
8 DAT1
11 GND
12 GND
13 GND
14 GND
9 DET_SW
10 COMMON
2018-10-08