Smart Module Series
SC690A_Series_Hardware_Design 33 / 105
USB_BOOT
57
DI
Force the module
into emergency
download mode
Pulled up to
LDO9_1V8 during
power-up will
force the module
into emergency
download mode.
GNSS_LNA_EN
202
DO
GNSS LNA enable
control
If unused, keep
this pin open.
JTAG Interface
Pin Name
Pin No.
I/O
Description
DC
Characteristics
Comment
JTAG_PS_
HOLD
183
DO
JTAG power-supply
hold
1.8 V power
domain
JTAG_TRST
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_RST_N
189
DI
JTAG reset for
debug
Reserved Interface
Pin Name
Pin No.
Comment
RESERVED
1, 2, 157, 166, 190, 191, 192, 212, 222, 244, 250, 252
Keep these pins
open.
GPIO Interfaces
Pin Name
Pin No.
I/O
Description
DC
Characteristics
Comment
GPIO_2
248
DIO
General-purpose
input/output
1.8 V power
domain.
GPIO_3
247
DIO
General-purpose
input/output
GPIO_4
58
DIO
General-purpose
input/output
GPIO_5
59
DIO
General-purpose
input/output
GPIO_14
251
DIO
General-purpose
input/output