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USIM2_VDD
210
UART Interface
Pin Name
Pin No.
UART2_TXD
5
UART2_RXD
6
UART4_TXD
7
UART4_RXD
8
UART5_RXD
198
UART5_TXD
199
UART5_RTS
245
UART5_CTS
246
UART6_RXD
61
UART6_TXD
60
SD Card Interface
Pin Name
Pin No.
SD_CLK
70
SC650T_Hardware_Design
(U)SIM2 card power
PO
supply
I/O
Description
UART2 transmit
data.
DO
Debug port by
default.
UART2 receive
data.
DI
Debug port by
default.
UART4 transmit
DO
data
DI
UART4 receive data
DI
UART5 receive data
UART5 transmit
DO
data
UART5 request to
DO
send
UART5 clear to
DI
send
DI
UART6 receive data
UART6 transmit
DO
data
I/O
Description
High speed digital
DO
clock signal of SD
card
Smart LTE Module Series
SC650T Hardware Design
0.8 × USIM2_VDD
1.8V (U)SIM：
Vmax=1.85V
Vmin=1.75V
Either 1.8V or 2.95V
(U)SIM card is
2.95V (U)SIM：
supported.
Vmax=3.1V
Vmin=2.8V
DC
Comment
Characteristics
V
max=0.45V
OL
V
min=1.35V
OH
V
max=0.63V
IL
V
min=1.17V
IH
V
max=0.45V
OL
V
min=1.35V
OH
V
max=0.63V
IL
1.8V power domain.
V
min=1.17V
IH
If unused, keep
V
max=0.63V
IL
these pins open.
V
min=1.17V
IH
V
max=0.45V
OL
V
min=1.35V
OH
V
max=0.45V
OL
V
min=1.35V
OH
V
max=0.63V
IL
V
min=1.17V
IH
V
max=0.63V
IL
V
min=1.17V
IH
V
max=0.45V
OL
V
min=1.35V
OH
DC
Comment
Characteristics
1.8V SD card：
V
max=0.45V
OL
V
min=1.4V
OH
28 / 131
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