Fibocom L831-EAU-01 - Clock Interface; Config Interface; Other Interfaces

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L831-EAU-01 Hardware User Manual Page
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3.8 Clock Interface
L831-EAU module has reserved 26MHz clock output while it currently does not support such clock output.
Pin
Pin Name
I/O
Reset Value
Pin Description
Type
46
SYSCLK
O
26M clock output
（
Reserved
）
1.8V
3.9 Config Interface
The L831-EAU module provides four config pins for the configuration as the WWAN-SSIC-0 type M.2
module:
Pin
Pin Name
I/O
Reset Value
Pin Description
Type
1
CONFIG_3
O
L
Internally connected to GND
21
CONFIG_0
O
NC
69
CONFIG_1
O
L
Internally connected to GND
75
CONFIG_2
O
L
Internally connected to GND
The M.2 module configuration as the following table:
Config_0
(pin21)
Config_1
(pin69)
Config_2
(pin75)
Config_3
(pin1)
Module Type and Main
Host Interface
Port
Configuration
NC
GND
GND
GND
WWAN-SSIC
0
Please refer to “PCI Express M.2 Specification Rev0.9-3”.
3.10 Other Interfaces
The ANT Tunable interface of the module is connected to an external open-line switch, so as to connect to
antennas with different impedances and configure with different frequencies, L831-EAU currently does
not support this function.
The COEX interface of the module is designed to avoid mutual interference between WLAN/BT/GNSS
during simultaneous operation, L831-EAU currently does not support this function.
For USB Super-speed Inter-Chip (SSIC) interface of the module, L831-EAU currently does not support
this function, and Floating is recommended.
For I2S interface of the module, L831-EAU currently does not support this function, and Floating is
recommended.