LTE Module Series
EG21-G Hardware Design
EG21-G_Hardware_Design 26 / 100
the module.
If unused, keep it
open.
W_DISABLE#
4
DI
Airplane mode
control
V
IL
min=-0.3V
V
IL
max=0.6V
V
IH
min=1.2V
V
IH
max=2.0V
1.8V power domain.
Pull-up by default.
In low voltage level,
module can enter into
airplane mode.
If unused, keep it
open.
AP_READY
2
DI
Application
processor sleep
state detection
V
IL
min=-0.3V
V
IL
max=0.6V
V
IH
min=1.2V
V
IH
max=2.0V
1.8V power domain.
If unused, keep it
open.
USB_BOOT Interface
Pin Name
Pin No.
I/O Description
DC Characteristics Comment
USB_BOOT
115
DI
Force the module to
enter into
emergency
download mode
V
IL
min=-0.3V
V
IL
max=0.6V
V
IH
min=1.2V
V
IH
max=2.0V
1.8V power domain.
Active high.
It is recommended to
reserve test point.
RESERVED Pins
Pin Name
Pin No.
I/O Description
DC Characteristics Comment
RESERVED
3, 18, 43,
55, 73~84,
113, 114,
116, 117,
118~138,
140~144
Reserved
Keep these pins
unconnected.
1.
Pads 24~27 are multiplexing pins used for audio design on EG21-G module and BT function on FC20
module.
2.
“*” means under development.
3.4.
Operating Modes
The table below briefly summarizes the various operating modes referred in the following chapters.
NOTES
