Datasheet

Micro-SD card
An Ultra Secure Digital Host Controller (uSDHC) module provides the interface between the host and SD/SDIO/MMC
cards, with the following features:
SD/SDIO standard, up to version 3.0
MMC standard, up to version 5.0
3.3V operation only
1- and 4-bit SD/SDIO/MMC modes
Version 1.2 (August 2019)
Table 20. SD/MMC pin signals
Name Type Connector Pins Voltage Description
SD2_CLK Output J1310 48 3.3V Serial clock
SD2_CMD Output J1310 26 3.3V Command line
Pull-up in SoM: 10k Ohm
SD2_nCD
(SD2_CD_B)
Output J1310 24 3.3V Card detect
SD2_DAT0 I/O J1310 28 3.3V Data bit 0
Pull-up in SoM: 10k Ohm
SD2_DAT1 I/O J1310 32 3.3V Data bit 1
SD2_DAT2 I/O J1310 34 3.3V Data bit 2
SD2_DAT3 I/O J1310 38 3.3V Data bit 3
SD2_nRST
(SD2_RESET_B)
Output J1310 36 3.3V Card reset
SDIO_WAKE
(SD2_WP)
Output J1310 30 3.3V Write protect or GPIO
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