Application Interfaces; Pin Assignment - Quectel LTE Standard Module Series Hardware Design

3

Application Interfaces

The physical connections and signal levels of EG21-G Mini PCIe comply with PCI Express Mini Card
Electromechanical Specification. This chapter mainly describes the definition and application of the
following interfaces/pins of EG21-G Mini PCIe:

Power supply

(U)SIM interface

USB interface

UART interface

PCM and I2C interfaces

Control and indication signals

3.1. Pin Assignment

The following figure shows the pin assignment of EG21-G Mini PCIe module. The top side contains
EG21-G module and antenna connectors.
Pin Name
WAKE#
RESERVED
RESERVED
RESERVED
GND
UART_RX
UART_TX
GND
RI
RESERVED
GND
UART_CTS
UART_RTS
GND
GND
DTR
RESERVED
GND
GND
VCC_3V3
VCC_3V3
GND
PCM_CLK
PCM_DOUT
PCM_DIN
PCM_SYNC
EG21-G_Mini_PCIe_Hardware_Design
Pin No.
1
3
5
7
9 PIN1
11
13
15
17
TOP
19
21
23
25
27
29
PIN51
31
33
35
37
39
41
43
45
47
49
51
Figure 2: Pin Assignment
LTE Standard Module Series
EG21-G Mini PCIe Hardware Design
Pin No.
2
4
6
8
10
PIN2
12
14
16
18
BOT
20
22
24
26
28
30
PIN52
32
34
36
38
40
42
44
USIM_PRESENCE
46
48
50
52
Pin Name
VCC_3V3
GND
NC
USIM_VDD
USIM_DATA
USIM_CLK
USIM_RST
RESERVED
GND
W_DISABLE#
PERST#
RESERVED
GND
NC
I2C_SCL
I2C_SDA
GND
USB_DM
USB_DP
GND
LED_WWAN#
RESERVED
NC
GND
VCC_3V3
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