Quectel EC21-AU User Manual

LTE Standard Module Series
EC21_Series_Hardware_Design
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Pin Name Pin No. I/O Description
DC
Characteristics
Comment
SDC2_DATA3 28 DIO
SD card SDIO data
bit 3
1.8 V signaling:
V
OL
max = 0.45 V
V
OH
min = 1.4 V
V
IL
min = -0.3 V
V
IL
max = 0.58 V
V
IH
min = 1.27 V
V
IH
max = 2.0 V
3.0 V signaling:
V
OL
max = 0.38 V
V
OH
min = 2.01 V
V
IL
min = -0.3 V
V
IL
max = 0.76 V
V
IH
min = 1.72 V
V
IH
max = 3.34 V
SDIO signal level can
be selected according
to the signal level
supported by SD card,
see SD 3.0 protocol
for more details.
If unused, keep them
open.
SDC2_DATA2 29 DIO
SD card SDIO data
bit 2
SDC2_DATA1 30 DIO
SD card SDIO data
bit 1
SDC2_DATA0 31 DIO
SD card SDIO data
bit 0
SDC2_CLK 32 DO SD card SDIO clock
1.8 V signaling:
V
OL
max = 0.45 V
V
OH
min = 1.4 V
3.0 V signaling:
V
OL
max = 0.38 V
V
OH
min = 2.01 V
SDIO signal level can
be selected according
to the signal level
supported by SD card,
see SD 3.0 protocol
for more details.
If unused, keep it
open.
SDC2_CMD 33 DIO
SD card SDIO
command
1.8 V signaling:
V
OL
max = 0.45 V
V
OH
min = 1.4 V
V
IL
min = -0.3 V
V
IL
max = 0.58 V
V
IH
min = 1.27 V
V
IH
max = 2.0 V
3.0 V signaling:
V
OL
max = 0.38 V
V
OH
min = 2.01 V
V
IL
min = -0.3 V
V
IL
max = 0.76 V
V
IH
min = 1.72 V
V
IH
max = 3.34 V
SDIO signal level can
be selected according
to the signal level
supported by SD card,
see SD 3.0 protocol
for more details.
If unused, keep it
open.
SD_INS_DET 23 DI
SD card insertion
detect
V
IL
min = -0.3 V
V
IL
max = 0.6 V
V
IH
min = 1.2 V
V
IH
max = 2.0 V
1.8 V power domain.
If unused, keep it
open.

Quectel EC21-AU Specifications

General

Brand	Quectel
Model	EC21-AU
Category	Control Unit
Language	English