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Snapdragon 820 SMARC SOM Hardware User Guide
iWave Systems Technologies Pvt. Ltd.
2.5.3
Micro SD Connector slot
The Snapdragon 820 SMARC SOM supports Micro SD slot which can be used to connect Micro SD card as Mass storage.
Micro SD card connector (J3) is directly connected to the SDC4 controller of the APQ8096 CPU. The main power to
Micro SD Card Connector is 2.95 Voltage. Micro SD Connector is physically located on Top side of the Snapdragon 820
SMARC SOM as shown below.
Figure 2: Micro SD Connector
Table 3: Micro SD Connector Pin Out
Pin
No
Pin Name
Signal Name
Signal Type/
Termination
Description
1
DAT2
SDC4_DATA_2(GPIO_94)
IO 1.8 V CMOS
SD Interface Data Line2.
2
DAT3
SDC4_DATA_3(GPIO_92)
IO 1.8 V CMOS
SD Interface Data Line3.
3
CMD
SDC4_CMD(GPIO_91)
IO 1.8 V CMOS
SD Interface Command Line.
4
VDD
GND
O, 2.95V Power
2.95V Supply Voltage.
5
CLK
SDC4_CLK(GPIO_93)
IO 1.8 V CMOS
SD Interface Clock.
6
VSS
GND
Power
Ground.
7
DAT0
SDC4_DATA_0(GPIO_96)
IO 1.8 V CMOS
SD Interface Data Line0.
8
DAT1
SDC4_DATA_1(GPIO_95)
IO 1.8 V CMOS
SD Interface Data Line1.
9
CDB
SDC4_CD_N(GPIO_26)
I, 1.8V CMOS
/1M PU
SD Interface Card Detect.
10
CDA
GND
Power
Ground.
11
M1
GND
Power
Ground.
12
M2
GND
Power
Ground.
13
M3
GND
Power
Ground.