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