Product Info

LTE Module Series
EC25 Hardware Design
EC25_Hardware_Design 27 / 112
VBAT_RF 57, 58 PI
Power supply for
module’s RF part
Vmax=4.3V
Vmin=3.3V
Vnorm=3.8V
It must be able to
provide sufficient
current up to 1.8A in a
burst transmission.
VDD_EXT 7 PO
Provide 1.8V for
external circuit
Vnorm=1.8V
I
O
max=50mA
Power supply for
external GPIO’s pull-up
circuits.
GND
8, 9, 19,
22, 36, 46,
48, 50~54,
56, 72,
85~112
Ground
Turn on/off
Pin Name Pin No. I/O Description DC Characteristics Comment
PWRKEY 21 DI
Turn on/off the
module
V
IH
max=2.1V
V
IH
min=1.3V
V
IL
max=0.5V
The output voltage is
0.8V because of the
diode drop in the
Qualcomm chipset.
RESET_N 20 DI Reset the module
V
IH
max=2.1V
V
IH
min=1.3V
V
IL
max=0.5V
If unused, keep it
open.
Status Indication
Pin Name Pin No. I/O Description DC Characteristics Comment
STATUS 61 OD
Indicate the module
operating status
The drive current
should be less than
0.9mA.
An external pull-up
resistor is required. If
unused, keep it open.
NET_MODE 5 DO
Indicate the module
network registration
mode
V
OH
min=1.35V
V
OL
max=0.45V
1.8V power domain.
Cannot be pulled up
before startup.
If unused, keep it
open.
NET_
STATUS
6 DO
Indicate the module
network activity
status
V
OH
min=1.35V
V
OL
max=0.45V
1.8V power domain.
If unused, keep it
open.
USB Interface
Pin Name Pin No. I/O Description DC Characteristics Comment
USB_VBUS 71 PI USB detection
Vmax=5.25V
Vmin=3.0V
Vnorm=5.0V
Typical: 5.0V
If unused, keep it
open.