User's Manual

Page 14 of 31
2.2.5 Micro SD card interface
U6100 provides a Micro SD card interface for extended mass memory. The Micro SD card interface can also be used
for T-Flash card and MMC card.
2.2.5.1 Description
U6100 provides Micro SD card interface by 60PIN board to board connector. The Table 2-7 gives the more detail
information.
Table 2-7 U6100 Micro SD card interface description
2.2.5.2 Reference circuit
The reference circuit of Micro SD card interface is shown in Figure 2-9.
1) The data line of Micro SD such as SDCC_DATA0, SDCC_DATA1, SDCC_DATA2, SDCC_DATA3 and
SDCC_CMD, should be connected to Micro SD card power supply by pull-up resistors with reference value 10KΩ.
Just like R304, R305, R301, R302 and R303 in Figure 2-9.
2) To get more flat Micro SD card power supply, it is recommended to use filter capacitors. Just like C307 and C308 in
Figure 2-9, and the reference values are 33pF and 100nF.
3) To eliminate high-frequency interference, it is recommended to use capacitors for Micro SD card data line, such as
Signals of
Micro SD interface
Pins of 60Pin
board to board connector
SN. of 60Pin
board to board connector
Description
DATA2 SDCC_DATA2 33 Micro SD card data2
DATA3 SDCC_DATA3 35 Micro SD card data3
CMD SDCC_CMD 34 The signal for command, reading
or writing
VCC VREG_MMC 37 SD/MMC Power
CLK SDCC_CLK 32 CLK
DATA0 SDCC_DATA0 29 Micro SD card data0
DATA1 SDCC_DATA1 31 Micro SD card data1
GND GND 7, 8, 13, 14, 16, 19, 22, 26, 27, 30,
36, 40, 42, 47, 55, 59
GND