Smart LTE Module Series
SC66 Hardware Design
SC66_Hardware_Design 31 / 139
V
IH
min=
0.7 × USIM1_VDD
V
OL
max=0.4V
V
OH
min=
0.8 × USIM1_VDD
USIM1_VDD
141
PO
(U)SIM1 card power
supply
Either 1.8V or 2.95V
(U)SIM card is
supported.
USIM2_DET
256
DI
(U)SIM2 card
hot-plug detection
V
IL
max=0.63V
V
IH
min=1.17V
Active Low.
Need external pull-up
to 1.8V.
If unused, keep it
open.
USIM2_RST
207
DO
(U)SIM2 card reset
signal
V
OL
max=0.4V
V
OH
min=
0.8 × USIM2_VDD
Cannot be multiplexed
into general-purpose
GPIOs.
USIM2_CLK
208
DO
(U)SIM2 card clock
signal
V
OL
max=0.4V
V
OH
min=
0.8 × USIM2_VDD
USIM2_DATA
209
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
210
PO
(U)SIM2 card power
supply
Either 1.8V or 2.95V
(U)SIM card is
supported.
UART Interfaces
Pin Name
Pin
No.
I/O
Description
DC Characteristics Comment
DEBUG_TXD
5
DO
DEBUG UART
transmit data.
V
OL
max=0.45V
V
OH
min=1.35V
1.8V power domain.
If unused, leave these
pins open.
DEBUG_RXD
6
DI
DEBUG UART
receive data.
V
IL
max=0.63V
V
IH
min=1.17V
UART1_TXD
7
DO
UART1 transmit
data
V
OL
max=0.45V
V
OH
min=1.35V
UART1_RXD
8
DI
UART1 receive data
V
IL
max=0.63V
V
IH
min=1.17V
UART6_RXD
198
DI
UART6 receive data
