Smart Module Series
SC20_Series_Hardware_Design 27 / 133
USIM2_DATA
20
DIO (U)SIM2 card data
V
IL
max =
0.2 × USIM2_VDD
V
IH
min =
0.7 × USIM2_VDD
V
OL
max = 0.4 V
V
OH
min =
0.8 × USIM2_VDD
Externally pull it up
to USIM2_VDD
with a 10 kΩ
resistor.
USIM2_VDD
21
PO
(U)SIM2 card
power supply
For 1.8 V (U)SIM:
Vmax = 1.85 V
Vmin = 1.75 V
For 2.95 V (U)SIM:
Vmax = 3.1V
Vmin = 2.8 V
Either 1.8 V or 2.95
V (U)SIM card is
supported by the
module
automatically.
USIM1_DETECT
22
DI
(U)SIM1 card
hot-plug detect
V
IL
max = 0.63 V
V
IH
min = 1.17 V
Active low.
Externally pull it up
to 1.8 V.
If unused, keep this
pin open.
USIM1_RST
23
DO
(U)SIM1 card
reset
V
OL
max = 0.4 V
V
OH
min =
0.8 × USIM1_VDD
USIM1_CLK
24
DO
(U)SIM1 card
clock
USIM1_DATA
25
DIO (U)SIM1 card data
V
IL
max =
0.2 × USIM1_VDD
V
IH
min =
0.7 × USIM1_VDD
V
OL
max = 0.4 V
V
OH
min =
0.8 × USIM1_VDD
Externally pull it up
to USIM1_VDD
with a 10 kΩ
resistor.
USIM1_VDD
26
PO
(U)SIM1 card
power supply
For 1.8 V (U)SIM:
Vmax = 1.85 V
Vmin = 1.75 V
For 2.95 V (U)SIM:
Vmax = 3.1V
Vmin = 2.8 V
Either 1.8 V or 2.95
V (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
V
OL
max = 0.45 V
V
OH
min = 1.35 V
1.8 V power
domain.
