Fibocom L831-EAU-01 - M.2 Pin Definition

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L831-EAU-01 Hardware User Manual Page
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Note:
Pin “Notch” represents the gap of the gold fingers.
3.1.2 Pin Definition
The pin definition is as follows:
Pin
Pin Name
I/O
Reset
Value
Pin Description
Type
1
CONFIG_3
O
L
Connected to internal GND
2
+3.3V
PI
Module main power input
Power Supply
3
GND
GND
Power Supply
4
+3.3V
PI
Module main power input
Power Supply
5
GND
GND
Power Supply
6
FULL_CARD_POWER_OFF#
I
WWAN M.2 Power on/off control
signal
CMOS 1.8V
7
USB D+
I/O
USB 2.0 D+ signal
0.3---3V
8
W_DISABLE#
I
PU
WWAN M.2 RF Disable signal
3.3V/1.8V
9
USB D-
I/O
USB 2.0 D- signal
0.3---3V
10
LED#1
O
OD
System status LED, drain output
CMOS 3.3V
11
GND
GND
Power Supply
12
Notch
Notch
13
Notch
Notch
14
Notch
Notch
15
Notch
Notch
16
Notch
Notch
17
Notch
Notch
18
Notch
Notch
19
Notch
Notch
20
I2S_CLK
O
PD
I2S serial clock（Reserved）
CMOS 1.8V
21
CONFIG_0
O
Not connected