Quectel RG520N-AT - SDIO Interface

5G Module Series
RG520N-AT_Hardware_Design 58 / 109
4.8. SDIO Interface
The module provides one SDIO interface which supports SD 3.0 protocol for SD card connection.
Table 21: Pin Definition of SDIO Interface
The following figure illustrates a reference design of SDIO interface.
Pin Name
Pin No.
I/O
Description
Comment
SDIO_VDD
60
PI
SDIO power supply
1.8/2.95 V configurable
input.
If unused, connect it to
VDD_EXT.
SDIO_DATA0
49
DIO
SDIO data bit 0
If unused, keep them
open.
SDIO_DATA1
50
DIO
SDIO data bit 1
SDIO_DATA2
51
DIO
SDIO data bit 2
SDIO_DATA3
52
DIO
SDIO data bit 3
SDIO_CMD
48
DIO
SDIO command
SDIO_CLK
47
DO
SDIO clock
SDIO_PWR_EN
53
DO
SDIO power supply enable
SDIO_PWR_VSET
56
DO
SDIO power domain set
SDIO_DET
55
DI
SD card detect
Pull it up to VDD_EXT with
a 470 kΩ resistor.
If unused, keep it open.