Quectel EG91-EX - Page 25

LTE Standard Module Series
EG91 Series Hardware Design
EG91_Series_Hardware_Design 24 / 106
VBAT_RF 52, 53 PI
Power supply for
module’s RF part
Vmax=4.3V
Vmin=3.3V
Vnorm=3.8V
It must be provided with
sufficient current up to
1.8A in a burst
transmission.
VDD_EXT 29 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
3, 31, 48,
50, 54, 55,
58, 59, 61,
62, 67~74,
79~82,
89~91,
100~106
Ground
Power-on/off
Pin Name Pin No. I/O Description DC Characteristics Comment
PWRKEY 15 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 17 DI
Reset signal of the
module
V
IH
max=2.1V
V
IH
min=1.3V
V
IL
max=0.5V
Require pull-up
resistor to 1.8V
internally.
Active low.
If unused, keep it
open.
Status Indication
Pin Name Pin No. I/O Description DC Characteristics Comment
STATUS 20 DO
Indicate the
module’s operation
status
V
OH
min=1.35V
V
OL
max=0.45V
1.8V power domain.
If unused, keep it
open.
NETLIGHT 21 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 8 PI
USB connection
detection
Vmax=5.25V
Vmin=3.0V
Typical: 5.0V
If unused, keep it