Quectel EC21 Series, Hardware Design

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LTE Module Series
EC21 Hardware Design
EC21_Hardware_Design Confidential / Released 18 / 94
3.2. Pin Assignment
The following figure shows the pin assignment of EC21 module.
3
4
3
3
5
3
6
2
0
2
1
2
2
2
3
2
4
2
5
2
6
2
7
2
8
2
9
3
0
3
1
3
2
3
3
1
4
5
6
7
2
WAKEUP_IN
1)
AP_READY
RESERVED
W_DISABLE#
NET_MODE
1)
NET_STATUS
VDD_EXT
GND
GND
DBG_RXD
DBG_TXD
USIM_PRESENCE
USIM_VDD
USIM_DATA
USIM_CLK
USIM_RST
RESERVED
8
9
10
11
12
13
14
15
16
17
18
1
9
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
7
2
7
1
7
0
6
9
6
8
6
7
6
6
6
5
6
4
6
3
6
2
6
1
6
0
5
9
5
8
5
7
5
6
5
5
USIM_GND
G
N
D
R
E
S
E
T
_
N
P
W
R
K
E
Y
2
)
G
N
D
R
E
S
E
R
V
E
D
P
C
M
_
IN
※
P
C
M
_
O
U
T
※
P
C
M
_
S
Y
N
C
※
P
C
M
_
C
L
K
※
R
E
S
E
R
V
E
D
R
E
S
E
R
V
E
D
R
E
S
E
R
V
E
D
R
E
S
E
R
V
E
D
R
E
S
E
R
V
E
D
R
E
S
E
R
V
E
D
A
N
T
_
D
IV
G
N
D
G
N
D
U
S
B
_
V
B
U
S
U
S
B
_
D
M
U
S
B
_
D
P
R
X
D
T
X
D
D
T
R
R
T
S
C
T
S
D
C
D
R
I
S
T
A
T
U
S
V
B
A
T
_
B
B
V
B
A
T
_
B
B
V
B
A
T
_
R
F
V
B
A
T
_
R
F
G
N
D
R
E
S
E
R
V
E
D
GND
GND
ANT_MAIN
GND
ANT_GNSS
GND
ADC1
RESERVED
I2C_SDA
I2C_SCL
BT_CTS
ADC0
GND
GND
GND
73
74
75
76
77
78
79
80
81
82
83
84
100
101
102
106
107
111
112
103
104 109
105 110
89 94 98
88
93 97
86 91 96
85 90 95 99
87 92
108
11
3
R
E
S
E
R
V
E
D
R
E
S
E
R
V
E
D
117
126
125
124
123
122
121
120
119
118
127
128
11
5
U
S
B
_
B
O
O
T
R
E
S
E
R
V
E
D
11
6
139
140
138
137
136
135
134
133
132
131
130
129
11
4
R
E
S
E
R
V
E
D
Power Pins
BT_RXD
BT_TXD
BT_RTS
Signal Pins RESERVED Pins GND Pins
RESERVED
RESERVED
141
142
RESERVED
RESERVED
143
144
SGMII Pins
WLAN Pins Bluetooth Pins
Figure 2: Pin Assignment (Top View)
1.
1)
means that these pins cannot be pulled up before startup.
2.
2)
PWRKEY output voltage is 0.8V because of the diode drop in the Qualcomm chipset.
3. Pads 119~126 are SGMII function pins.
4. Pads 37~40, 118, 127 and 129~139 are wireless connectivity interfaces, among which pads 127 and
129~138 are WLAN function pins, and others are Bluetooth (BT) function pins. BT function is under
development.
5. Pads 24~27 are multiplexing pins used for audio design on EC21 module and BT function on FC20
NOTES
Quectel
Confidential