Sd Card Interface - Quectel SC200K Series Instruction Manual

4.4. SD Card Interface

The SD card interface of the module supports SD 3.0 specifications. The pin definition of the interface is
shown below.
Table 14: Pin Definition of SD Card Interface
Pin Name Pin No.
VDDSD 38
VDDSDIO 32
SD_DATA0 41
SD_DATA1 42
SD_DATA2 43
SD_DATA3 44
SD_CMD 40
SD_CLK 39
SD_DET 45
A reference circuit for SD card interface is shown below.
SD_DATA2
SD_DATA3
SD_CMD
SD_CLK
SD_DATA0
SD_DATA1
SD_DET
Module
SC200K_Series_Hardware_Design
I/O Description
PO Power supply for SD card
Power supply for SDIO
PO
pull-up circuit
DIO SDIO data bit 0
DIO SDIO data bit 1
DIO SDIO data bit 2
DIO SDIO data bit 3
DIO SD card command
DO SD card clock
DI SD card hot-plug detect
VDD1V85
R1 R2
R3
120K
NM_51K NM_51K NM_10K NM_51K NM_51K
R7 33R
R8
33R
R9
33R
R10 33R
R11
33R
R12
33R
R13 1K
D1 D2 D3
Figure 20: Reference Circuit for SD Card Interface
VDDSD
VDDSDIO
R6
R4 R5
C1 C2
D4 D5 D6 D7
4.7 μF
33 pF
Smart Module Series
Comment
It is suggested to add an LDO
with output current of 1 A if an
external large-capacity
card is needed.
Only for SD_DATA and
SD_CMD pull-up circuits.
50 Ω single-ended impedance.
Active low.
1
P1-DAT2
2
P2-CD/DAT3
3
P3-CMD
4
P4-VDD
5
P5-CLK
6
P6-VSS
7
P7-DAT0
8
P8-DAT1
9
DETECTIVE
10
GND
D8
11
GND
12
GND
13
GND
SD Card Connector
50 / 105
SD