Service Guide

LTE Standard Module Series
EG91_Series_Hardware_Design
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Table 4: Pin Description
Power Supply
Pin Name
Pin
No.
I/O Description
DC
Characteristics
Comment
VBAT_BB 32, 33 PI
Power supply for the
module’s baseband
part
Vmax = 4.3 V
Vmin = 3.3 V
Vnom = 3.8 V
It must be provided with
sufficient current up to
0.8 A.
VBAT_RF 52, 53 PI
Power supply for the
module’s RF part
Vmax = 4.3 V
Vmin = 3.3 V
Vnom = 3.8 V
It must be provided with
sufficient current up to
1.8 A in a burst
transmission.
VDD_EXT 29 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.
If unused, keep it open.
GND 3, 31, 48, 50, 54, 55, 58, 59, 61, 62, 67–74, 79–82, 89–91, 100–106
Power-on/off
Pin Name
Pin
No.
I/O Description
DC
Characteristics
Comment
PWRKEY 15 DI
Turn on/off the
module
V
IH
= 0.8 V
The output voltage is
0.8 V because of the
diode drop in the
baseband chipset.
RESET_N 17 DI Reset the module
V
IH
max = 2.1 V
V
IH
min = 1.3 V
V
IL
max = 0.5 V
Require pull-up resistor
to 1.8 V 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 = 1.35 V
V
OL
max = 0.45 V
1.8 V power domain.
If unused, keep it open.
NETLIGHT 21 DO
Indicate the
module’s network
activity status
USB Interface
Pin Name
Pin
No.
I/O Description
DC
Characteristics
Comment