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FIBOCOM NL668-EAU-MiniPCIe-10 Hardware User Manual
Page 18 of 56
Pin Pin Name
I/O
Level
Description
Vmin=3.3V
Vnorm=3.8V
40
GND
G
-
Ground
41
VBAT
PI
Vmax=4.3V
Vmin=3.3V
Vnorm=3.8V
Module power supply
42
NET_MODE
O
OC
Indicator signal
43
GND
G
-
Ground
44
USIM_PRESENCE
I
1.8V
(U)SIM hot plug detection
45
PCM_CLK
IO
VOLmax=0.45V
VOHmin=1.35V
VILmin=-0.3V
VILmax=0.6V
VIHmin=1.2V
V
IH
max=2.0V
PCM clock signal
46
DBG_UART_TX
O
V
OL
max=0.45V
V
OH
min=1.35V
DEBUG serial port transmission
47
PCM_OUT
O
V
OL
max=0.45V
V
OH
min=1.35V
PCM data transmission
48
NC
-
-
Reserved
49
PCM_IN
I
V
IL
min=-0.3V
V
IL
max=0.6V
V
IH
min=1.2V
V
IH
max=2.0V
PCM data reception
50
GND
G
-
Ground
51
PCM_SYNC
O
V
OL
max=0.45V
V
OH
min=1.35V
V
IL
min=-0.3V
V
IL
max=0.6V
V
IH
min=1.2V
V
IH
max=2.0V
PCM synchronization signal
52
VBAT
PI
Vmax=4.3V
Vmin=3.3V
Vnorm=3.8V
Module power supply
Table 3-1 Pin Definition
Note:
Keep the unused pins floating.
3.2 Power
The power interfaces of module are shown in the following table.
Pin Name
I/O
Pin
Description
VBAT
I
2,24,39,41,52
Module power supply, 3.3V ~ 4.3V,
