Sd Card Interface - Quectel SC690A Series Hardware Design

4.4. SD Card Interface

The module supports SD 3.0 specifications. The pin definition of the SD card interface is shown below.
Table 15: Pin Definition of SD Card Interface
Pin Name Pin No.
SD_CLK 70
SD_CMD 69
SD_DATA0 68
SD_DATA1 67
SD_DATA2 66
SD_DATA3 65
SD_DET 64
SD_LDO22 63
SD_LDO5 179
A reference circuit for SD card interface is shown below.
Module
SD_DATA2
SD_DATA3
SD_CMD
SD_CLK
SD_DATA0
SD_DATA1
SD_DET
GND
SC690A_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 SD card power supply
1.8/2.95 V output power for SD card pull-up
PO
circuits
LDO9_1V8
R9
R8
R1 33 R
R2 33 R
R3 33 R
R4 33 R
R5 33 R
R6 33 R
R7 1 K
D1 D2 D3
Figure 16: Reference Circuit for SD Card Interface
SD_LDO22
SD_LDO5
R13
R11 R12
R10
D4 D5 D6 D7
Smart Module Series
Comment
Active low.
R14
0 R
P1-DAT2
P2-CD/DAT3
P3-CMD
P4-VDD
P5-CLK
P6-VSS
P7-DAT0
P8-DAT1
DETECTIVE
C1 C2
GND
D8
33 pF
4.7 μF
SD Card Connector
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