Sdio Interface - Quectel RG520N-AT Hardware Design

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