Quectel EC21 Series User Manual

LTE Standard Module Series
EC21_Series_Hardware_Design
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VBAT_RF 57, 58 PI
Power supply for
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 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.
When used with FC20
series/FC21 modules,
it also defaults to
supply power to the
VIO pin of FC20
series/FC21 modules.
If unused, keep it
open.
GND 8, 9, 19, 22, 36, 46, 48, 50–54, 56, 72, 85–112
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
baseband chipset.
RESET_N 20 DI Reset 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 Interface
Pin Name Pin No. I/O Description
DC
Characteristics
Comment
STATUS 61 OD
Indicate the
module's operation
status
The driving 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.
Cannot be pulled up
before startup.
If unused, keep it
open.

Quectel EC21 Series Specifications

General

Brand	Quectel
Model	EC21 Series
Category	Control Unit
Language	English