Sd Card Interface - Quectel SC200R Series Hardware Design

3.12. SD Card Interface

SD Card interface of SC200R series module supports SD 3.0 protocol. The pin definition of SD card
interface is shown below.
Table 16: Pin Definition of SD Card Interface
Pin Name Pin No.
SD_CLK 39
SD_CMD 40
SD_DATA0 41
SD_DATA1 42
SD_DATA2 43
SD_DATA3 44
SD_DET 45
SD_LDO11 38
SD_LDO12 32
A reference circuit for the SD card interface is shown below.
SD_DATA2
SD_DATA3
SD_CMD
SD_CLK
SD_DATA0
SD_DATA1
SD_DET
GND
Module
SC200R&SC262R_Series_Hardware_Design
I/O Description
DO SD card clock
DIO SD card command
DIO SDIO data bit 0
DIO SDIO data bit 1
DIO SDIO data bit 2
DIO SDIO data bit 3
DI SD card hot-plug detect
PO 2.95 V output power supply for SD card
1.8/2.95 V output power supply for SD
PO
card pull-up circuits.
LDO 5_1V8
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 17: Reference Circuit for SD Card Interface
SD_LDO11
SD_LDO12
R6
R4 R5 R14
0R
C1
D4 D5 D6 D7
4.7 μF
Smart Module Series
Comment
50 Ω characteristic
impedance.
Active low.
Vnom = 2.95 V
I max = 800 mA
O
Vnom = 1.8/2.95 V
I max = 50 mA
O
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
C2
11
GND
12
33 pF
GND
13
GND
SD Card Connector
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