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