5G Module Series
RG255C-GL_Mini_PCIe_Hardware_Design 16 / 57
14
USIM_RST
DO
(U)SIM card reset
USIM_VDD
15
GND
Ground
16
RESERVED
Reserved
17
RI
DO
Ring indication
3.3 V
18
GND
Ground
19
RESERVED
Reserved
20
W_DISABLE#
DI
Airplane mode control
3.3 V
Pulled up by
default.
Active low.
21
GND
Ground
22
PERST#
DI
Fundamental reset
3.3 V
Pulled up by
default.
Active low.
23
CTS
DI
Clear to send signal to
the module
3.3 V
24
RESERVED
Reserved
25
RTS
DO
Request to send signal
from the module
3.3 V
26
GND
Ground
27
GND
Ground
28
NC
Not connected
29
GND
Ground
30
I2C_SCL
DO
I2C serial clock
(for external codec)
1.8 V
Requires
external pull-up
to 1.8 V.
31
DTR
DI
Sleep mode control
3.3 V
32
I2C_SDA
DIO
I2C serial data
(for external codec)
1.8 V
Requires
external pull-up
to 1.8 V.
33
RESERVED
Reserved
34
GND
Ground
35
GND
Ground
