User's Guide

LE920A4 HW User Guide Hardware Interfaces
Doc#: 1VV0301261 Peripheral Ports
Rev. 4.7.1 Page 79 of 124 2019-11-21
Table 31 lists the module’s SD card signals.
Table 31: SD Card Signals
PAD Signal I/O Function Type Comments
AH17 SD/MMC_CMD I/O SD command 1.8/2.95V
AD17 SD/MMC_CLK O SD card clock 1.8/2.95V
Y17 SD/MMC_DATA0 I/O SD Serial Data 0 1.8/2.95V
AF17 SD/MMC_DATA1 I/O SD Serial Data 1 1.8/2.95V
AB17 SD/MMC_DATA2 I/O SD Serial Data 2 1.8/2.95V
W17 SD/MMC_DATA3 I/O SD Serial Data 3 1.8/2.95V
U17 SD/MMC_CD I SD card detect input 1.8V Active Low
S17 VMMC - Power supply for MMC
card pull-up resistors
1.8/2.95V Max Current
is 50 mA
Figure 18 shows the recommended connection diagram of the SD interface.
Figure 18: SD Interface Connectivity
SD/MMC_DATA2
SD/MMC_DATA3
SD/MMC_CMD
SD/MMC_CLK
SD/MMC_DATA0
SD/MMC_DATA1
Module
SDIO Interface
SD/MMC_CD
DATA2
DATA3
CMD
VDD
VSS
DATA0
DATA1
MicroSD
MMC_CD
GND
GND
10K
10K
10K
10K
10K
C=100nF
GND
External PS 3V
VMMC
CLK