Users Manual

LTE Standard Module Series
EC25 Hardware Design
EC25_Hardware_Design
26
/ 130
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.
If unused, keep it open.
GND
8, 9, 19,
22, 36, 46,
48, 50~54,
56, 72,
85~112
Ground
Power-on/off
Pin Name Pin No. I/O Description DC Characteristics Comment
PWRKEY 21 DI
Turn on/off the
module
V
H
=0.8V
The output voltage is
0.8V because of the
diode drop in the
Qualcomm chipset.
RESET_N 20 DI
Reset signal of 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’s network
registration mode
V
OH
min=1.35V
V
OL
max=0.45V
1.8V power domain.
It cannot be pulled up
before startup.
If unused, keep it
open.
NET_
STATUS
6 DO
Indicate the
module’s 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 connection
detection
Vmax=5.25V
Vmin=3.0V
Vnorm=5.0V
Typical: 5.0V.
If unused, keep it
open.