Smart Module Series
SC606T Series Hardware Design
SC606T_Series_Hardware_Design 50 / 116
EMI spurious transmission and enhance ESD protection. Ensure the ESD device is close to the
(U)SIM card connector.
⚫
Add 22 pF capacitors in parallel on USIM_DATA, USIM_CLK and USIM_RST signal traces so as to
filter RF interference, and place these capacitors as close to the (U)SIM card connector as possible.
3.11. SD Card Interface
The SD card interface of the module complies with SD 3.0 specifications. The pin definition of the SD card
interface is shown below.
Table 13: Pin Definition of SD Card Interface
A reference design for SD card interface is shown as below.
Pin Name
Pin No.
I/O Description
Comment
SD_LDO11
63
PO
SD card power supply
Vnom = 2.95 V
I
O
max = 800 mA
SD_LDO12
179
PO
1.8/2.95 V output power for SD card
pull-up circuits
1.8/2.95 V output.
SD_CLK
70
DO
SD card clock
Control the characteristic
impedance at 50
Ω.
SD_CMD
69
DIO
SD card command
SD_DATA0
68
DIO
SDIO data bit 0
SD_DATA1
67
DIO
SDIO data bit 1
SD_DATA2
66
DIO
SDIO data bit 2
SD_DATA3
65
DIO
SDIO data bit 3
SD_DET
64
DI
SD card hot-plug detect
Active low.