Pin Assignment - Quectel EC21 Series Hardware Design

3.2. Pin Assignment

The following figure shows the pin assignment of EC21 module.
1
WAKEUP_IN 1)
2
AP_READY
3
RESERVED
W_DISABLE# 4
1) 5
NET_MODE
6
NET_STATUS
7
VDD_EXT
141
RESERVED
142
RESERVED
8
GND
9
GND
10
USIM_GND
11
DBG_RXD
DBG_TXD 12
13
USIM_PRESENCE
14
USIM_VDD
15
USIM_DATA
16
USIM_CLK
17
USIM_RST
18
RESERVED
NOTES
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
EC21_Hardware_Design
129 117
108
103
130 118
131 119
132 120
109 104
133
121
134 122
110 105
135 123
136 124
111 106
137 125
138 126
139
127
107
112
140 128
GND Pins Signal Pins
WLAN Pins Power Pins
Figure 2: Pin Assignment (Top View)
99 95 90
100 96 91
82 79 76 73
83 80 77 74
92
84 81 78 75
97 93
101
98 94
102
RESERVED Pins
Bluetooth Pins
Confidential / Released
LTE Module Series
EC21 Hardware Design
54
GND
53 GND
52
GND
85
51
GND
50
GND
49
ANT_MAIN
86
48
GND
144
RESERVED
143
RESERVED
47
ANT_GNSS
87
46
GND
45
ADC0
44
ADC1
88
43
RESERVED
42
I2C_SDA
41
I2C_SCL
89
40
BT_CTS
39
BT_RXD
38
BT_TXD
37
BT_RTS
SGMII Pins
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