Service Guide

LTE Standard Module Series
EC200U_Series_Hardware_Design 17 / 94
VDD_EXT
7
PO
Provide 1.8 V for
external circuit
Vnom = 1.8 V
I
O
max = 50 mA
Power supply for
external GPIO’s
pull-up circuits. Add
2.2 μF capacitor if
used.
If unused, keep it
open.
Turn on/off
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
PWRKEY
21
DI
Turn on/off the
module
V
IL
max = 0.5 V
VBAT power domain
RESET_N
20
DI
Reset the module
V
IL
max = 0.5 V
VBAT power domain.
If unused, keep it
open. Active low.
Status Indication
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
STATUS
61
DO
Indicate module’s
operating status
1.8 V power domain.
If unused, keep it
open.
NET_MODE
5
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.
NET_STATUS
6
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.
If unused, keep it
open.
USB Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
USB_VBUS
71
AI
Used for USB
detection
Vmax = 5.25 V
Vmin = 3.5 V
Vnom = 5.0 V
Typical: 5.0 V
If unused, keep it
open.
USB_DP
69
AIO
USB differential data
bus (+)
Require differential
impedance of 90 Ω.
USB 2.0 compliant. If
unused, keep it open.
USB_DM
70
AIO
USB differential data
bus (-)
Require differential
impedance of 90 Ω.
USB 2.0 compliant. If