Product Info

Smart LTE Module Series
SC20 Hardware Design
SC20_Hardware_Design 29 / 130
V
IH
min=
0.7×USIM1_VDD
V
OL
max=0.4V
V
OH
min=
0.8×USIM1_VDD
USIM1_VDD
26
PO
(U)SIM1 card
power supply
For 1.8V (U)SIM:
Vmax=1.85V
Vmin=1.75V
For 2.95V (U)SIM:
Vmax=3.1V
Vmin=2.8V
Either 1.8V or 2.95V
(U)SIM card is
supported by the
module automatically
UART Interfaces
Pin Name
Pin No.
I/O
Description
DC
Characteristics
Comment
UART1_TX
34
DO
UART1 transmit
data
V
OL
max=0.45V
V
OH
min=1.35V
1.8V power domain.
If unused, keep this
pin open.
UART1_RX
35
DI
UART1 receive data
V
IL
max=0.63V
V
IH
min=1.17V
1.8V power domain.
If unused, keep this
pin open.
UART1_CTS
36
DI
UART1 clear to
send
V
IL
max=0.63V
V
IH
min=1.17V
1.8V power domain.
If unused, keep this
pin open.
UART1_RTS
37
DO
UART1 request to
send
V
OL
max=0.45V
V
OH
min=1.35V
1.8V power domain.
If unused, keep this
pin open.
UART2_RX
93
DI
UART2 receive
data.
Debug port by
default.
V
IL
max=0.63V
V
IH
min=1.17V
1.8V power domain.
If unused, keep this
pin open.
UART2_TX
94
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 this
pin open.
SD Card Interface
Pin Name
Pin No.
I/O
Description
DC
Characteristics
Comment
SD_CLK
39
DO
High speed digital
clock signal of SD
card
1.8V SD card:
V
OL
max=0.45V
V
OH
min=1.4V