Sd Card Interface - Quectel SG865W Series Hardware Design

4.3. 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 209
SD_CMD 215
SD_DATA0 226
SD_DATA1 220
SD_DATA2 214
SD_DATA3 208
SD_DET 203
SD_LDO9C 197
SD_LDO6C 228
A reference circuit for SD card interface is shown below.
SG865W_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
PO
SD card pull-up circuits
Smart Module Series
Comment
-
-
-
-
-
-
-
I max = 600 mA
O
Add a 1.0–2.2 μF bypass
capacitor if used.
If unused, keep this pin open.
I max = 150 mA
O
Add a 1.0–4.7 μF bypass
capacitor if used.
If unused, keep this pin open.
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