Service Guide

LTE Standard Module Series
EG915U_Series_Hardware_Design 19 / 90
VDD_EXT
29
PO
Provides 1.8 V for
external circuit
Vnom = 1.8 V
I
O
max = 50 mA
Power supply for
external GPIO’s
pull-up circuits.
Used with a
2.2 μF bypass
capacitor.
If unused, keep it
open.
Power On/Off
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
PWRKEY
15
DI
Turns on/off the module
V
IL
max = 0.5 V
VBAT power
domain.
RESET_N
17
DI
Resets the module
VBAT power
domain.
Active low.
If unused, keep it
open.
Indication Interfaces
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
STATUS
20
DO
Indicates the module’s
operation status
V
OH
min = 1.35 V
V
OL
max = 0.45 V
1.8 V power
domain.
If unused, keep it
open
NET_STATUS
21
DO
Indicates 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
8
AI
USB connection detect
Vmax = 5.25 V
Vmin = 3.5 V
Vnom = 5.0 V
If unused, keep it
open.
USB_DP
9
AIO
USB differential data (+)
USB 2.0
compliant.
Requires
differential
impedance of
90 Ω.
If unused, keep
them open.
USB_DM
10
AIO
USB differential data (-)