Quectel EC21-AU

LTE Standard Module Series
EC21_Series_Hardware_Design
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/ 118
VDD_SDIO 34 PO
SD card SDIO pull-
up power
I
O
max = 50 mA
Configurable power
supply.
1.8/2.85 V power
domain.
Cannot be used for SD
card power supply.
If unused, keep it
open.
SGMII Interface
Pin Name Pin No. I/O Description
DC
Characteristics
Comment
EPHY_RST_N 119 DO Ethernet PHY reset
1.8 V:
V
OL
max = 0.45 V
V
OH
min = 1.4 V
2.85 V:
V
OL
max = 0.35 V
V
OH
min = 2.14 V
1.8/2.85 V power
domain.
If unused, keep it
open.
EPHY_INT_N 120 DI
Ethernet PHY
interrupt
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.
SGMII_MDATA 121 DIO SGMII MDIO data
1.8 V
：
V
IL
max = 0.58 V
V
IH
min = 1.27 V
V
OL
max = 0.45 V
V
OH
min = 1.4 V
2.85 V
：
V
IL
max = 0.71 V
V
IH
min = 1.78 V
V
OL
max = 0.35 V
V
OH
min = 2.14 V
1.8/2.85 V power
domain.
If unused, keep it
open.
SGMII_MCLK 122 DO SGMII MDIO clock
1.8 V:
V
OL
max = 0.45 V
V
OH
min = 1.4 V
2.85 V:
V
OL
max = 0.35 V
V
OH
min = 2.14 V
1.8/2.85 V power
domain.
If unused, keep it
open.
SGMII_TX_M 123 AO SGMII transmit (-) Connect it with a