User's Manual

LTE Module Series
EC25Hardware Design
EC25_Hardware_DesignConfidential / Released 20 / 90
bursttransmission.
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
8,9,19,22,3
6,46,48,50
~54,56,72,
85~112
Ground
Turn on/off
Pin Name Pin No. I/O Description DC Characteristics Comment
PWRKEY 21 DI
Turnon/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
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.
Require external
pull-up. 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
USB_DP 69 IO
USB differential data
bus
Compliant with USB
2.0 standard
specification.
Require differential
impedance of 90ohm.