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FIBOCOM FG621-LA Series Hardware Guide
Page 14 of 57
3.2 Pin Function
The pin function description of FG621-LA series module is shown in the following table:
Table 3-1 Pin function description
Pin#
Pin Name
I/O
Level
Description
1
RESET_N
DI
V
IL
min=-0.3V
V
IL
max=0.5V
V
IH
max=VBAT_BB
Module reset signal,
active low, no need pull
up externally
2
PWRKEY
DI
V
IL
min=-0.3V
V
IL
max=0.5V
V
IH
max=VBAT_BB
Module power-on/off
signal, active low, no
need pull up externally
3
BT_EN*
DO
V
OL
max=0.45V
V
OH
min=1.35V
BT function enabling pin,
Reserved
5
WLAN_PWR_EN
*
DO
V
OH
min=1.35V
V
OL
max=0.45V
WLAN power supply
enabling, Reserved
24
USIM_GND
G
-
(U)SIM ground signal,
directly connected to the
main ground
25
USIM_DET
DI
V
IL
min=-0.3V
V
IL
max=0.6V
V
IH
min=1.2V
V
IH
max=2.0V
Detect (U)SIM for
hot-swap
26
USIM_VDD
PO
For 1.8V (U)SIM:
Vmax=1.9V
Vmin=1.7V
For 3.0V (U)SIM:
Vmax=2.95V
Vmin=2.75V
I
O
max=50mA
(U)SIM power supply,
the module automatically
identifies 1.8V or 3.0V
(U)SIM
27
USIM_CLK
DO
V
OL
max=0.45V
V
OH
min=1.35V
V
IL
min=-0.3V
V
IL
max=0.5V
V
IH
min=1.3V
V
IH
max=2.0V
(U)SIM clock signal line
28
USIM_RST
DO
For 1.8V (U)SIM:
V
OL
max=0.45V
V
OH
min=1.35V
For 3.0V (U)SIM:
V
OL
max=0.45V
V
OH
min=2.55V
(U)SIM reset signal line
29
USIM_DATA
DIO
For 1.8V (U)SIM:
V
IL
max=0.5V
V
IH
min=1.3V
V
OL
max=0.45V
(U)SIM data signal line
