Pin Assignment - Quectel EC21 Series Hardware Design

3.2. Pin Assignment

The following figure shows the pin assignment of EC21 series module.
1
WAKEUP_IN
2
AP_READY
3
RESERVED
W_DISABLE# 4
5
NET_MODE
6
NET_ST ATUS
VDD_EXT 7
141
RESERVED
142
RESERVED
8
GND
9
GND
10
USIM_GND
11
DBG_RXD
DBG_TXD 12
13
USIM_PRESENCE
14
USIM_VDD
USIM_DATA 15
16
USIM_CLK
17
USIM_RST
18
RESERVED
NOTE
1. WAKEUP_IN, NET_MODE, WLAN_EN, COEX_UART_RX, COEX_UART_TX, USB_BOOT and
BT_CTS cannot be pulled up before startup.
2. PWRKEY output voltage is 0.8 V because of the diode drop in the baseband chipset.
3. Digital audio (PCM) is only supported on Data + Voice version.
4. Pins 37–40, 118, 127 and 129–139 are used for WLAN & Bluetooth application interfaces, among
which pins 118, 127 and 129–138 are WLAN function pins, and the rest of pins are Bluetooth
EC21_Series_Hardware_Design
117
129
108
103
130 118
119
131
132
120
104
109
133
121
134 122
105
110
135 123
136 124
111 106
137 125
138 126
139 127
112 107
140 128
Power Pins Signal Pins
GND Pins Bluetooth Pins
Figure 2: Pin Assignment (Top View)
99 95 90
100 91
96
82 76 73
79
83 80 74
77
92
84
81 78 75
97 93
101
98 94
102
WLAN Pins
SGMII Pins
LTE Standard Module Series
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
RESERVED Pins
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