Product Info

LTE Standard Module Series
EC25 Series Hardware Design
EC25_Series_Hardware_Design 28 / 134
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
= 0.8 V
The output voltage is
0.8 V because of the
diode drop in the
Qualcomm chipset.
RESET_N
20
DI
Reset signal of the
module
V
IH
max = 2.1 V
V
IH
min = 1.3 V
V
IL
max = 0.5 V
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
0.9 mA.
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 = 1.35 V
V
OL
max = 0.45 V
1.8 V 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 = 1.35 V
V
OL
max = 0.45 V
1.8 V 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 = 5.25 V
Vmin = 3.0 V
Vnorm = 5.0 V
Typical: 5.0 V.
If unused, keep it
open.
USB_DP
69
IO
USB differential data
bus (+)
USB 2.0 Compliant.
Require differential
impedance of 90 Ω.
If unused, keep it