Smart LTE Module Series
SC650T Hardware Design
SC650T_Hardware_Design 38 / 131
FLASH_LED1 26
AO
Flash/torch current
driver output
Support flash and
torch modes.
FLASH_LED2 162
AO
Flash/torch current
driver output
Emergency Download Interface
Pin Name
Pin No.
I/O
Description
DC
Characteristics
Comment
USB_BOOT
57
DI
Force the module to
enter into
emergency
download mode
Pulled up to
LDO5_1P8 during
power-up will force
the module to enter
into emergency
download mode.
Other Interfaces
Pin Name
Pin No.
I/O
Description
DC
Characteristics
Comment
GNSS_LNA_
EN
202
DO
LNA enable signal
If unused, keep this pin
open.
OPTION
211
DI
Choose different
charging modes
Choose Micro USB or
TYPE-C
JTAG Interfaces
Pin Name
Pin No.
I/O
Description
DC
Characteristics
Comment
JTAG_PS_HO
LD
183
DO
Power hold signal
JTAG_TRST_
N
184
DI
JTAG reset
JTAG_TCLK
188
DI
JTAG clock input
JTAG_TMS
185
DI
JTAG mode-select
input
JTAG_TDO
186
DO
JTAG data output
JTAG_TDI
187
DI
JTAG data input
JTAG_SRST_
N
189
DI
JTAG reset for debug
Reserved Interface
Pin Name
Pin No.
I/O
Description
DC
Characteristics
Comment