Product Info

LTE Module Series
EC25 Hardware Design
EC25_Hardware_Design 37 / 112
1. “*” means under development.
2. Pads 24~27 are multiplexing pins used for audio design on the EC25 module and BT function on the
BT module.
V
IH
max=2.0V 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.
Cannot be pulled up
before startup.
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,
140-144.
Reserved
Keep these pins
unconnected.
NOTES