Product Info

LTE Standard Module Series
EC25 Series Hardware Design
EC25_Series_Hardware_Design 38 / 134
1.
1)
PCM interface pins are used for audio design on EC25 series module and BT function on FC20
module.
2. BT function is under development.
V
IH
min = 1.2 V
V
IH
max = 2.0 V
before startup.
Low level wakes up
the module.
If unused, keep it
open.
W_DISABLE#
4
DI
Airplane mode
control
V
IL
min = -0.3 V
V
IL
max = 0.6 V
V
IH
min = 1.2 V
V
IH
max = 2.0 V
1.8 V power domain.
Pull-up by default.
At low voltage level,
module can enter
airplane mode.
If unused, keep it
open.
AP_READY
2
DI
Application
processor sleep
state detection
V
IL
min = -0.3 V
V
IL
max = 0.6 V
V
IH
min = 1.2 V
V
IH
max = 2.0 V
1.8 V 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 emergency
download mode
V
IL
min = -0.3 V
V
IL
max = 0.6 V
V
IH
min = 1.2 V
V
IH
max = 2.0 V
1.8 V 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