Product Info

Smart LTE Module Series
SC20 Hardware Design
SC20_Hardware_Design 28 / 130
USB_ID
16
AI
USB ID detection
High level by default.
(U)SIM Interfaces
Pin Name
Pin No.
I/O
Description
DC
Characteristics
Comment
USIM2_
DETECT
17
DI
(U)SIM2 card
hot-plug detection
V
IL
max=0.63V
V
IH
min=1.17V
Active Low. External
pull-up resistor is
required.
If unused, keep this
pin open.
USIM2_RST
18
DO
(U)SIM2 card
reset signal
V
OL
max=0.4V
V
OH
min=
0.8×USIM2_VDD
USIM2_CLK
19
DO
(U)SIM2 card
clock signal
V
OL
max=0.4V
V
OH
min=
0.8×USIM2_VDD
USIM2_DATA
20
IO
(U)SIM2 card data
signal
V
IL
max=
0.2×USIM2_VDD
V
IH
min=
0.7×USIM2_VDD
V
OL
max=0.4V
V
OH
min=
0.8×USIM2_VDD
USIM2_VDD
21
PO
(U)SIM2 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.
USIM1_
DETECT
22
DI
(U)SIM1 card
hot-plug detection
V
IL
max=0.63V
V
IH
min=1.17V
Active low. External
pull-up resistor is
required.
If unused, keep this
pin open.
USIM1_RST
23
DO
(U)SIM1 card
reset signal
V
OL
max=0.4V
V
OH
min=
0.8×USIM1_VDD
USIM1_CLK
24
DO
(U)SIM1 card
clock signal
V
OL
max=0.4V
V
OH
min=
0.8×USIM1_VDD
USIM1_DATA
25
IO
(U)SIM1 card data
signal
V
IL
max=
0.2×USIM1_VDD