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FIBOCOM NL668-LA Series Hardware Guide
Page 15 of 61
Pin No.
Pin Name
I/O Level
Description
11
DBG_RXD
I
V
IL
min=-0.3V
V
IL
max=0.6V
V
IH
min=1.2V
V
IH
max=2.0V
Debug serial port receive data
12
DBG_TXD
O
V
OL
max=0.45V
V
OH
min=1.35V
Debug serial port transmit data
13
USIM_PRESENCE
I
V
IL
min=-0.3V
V
IL
max=0.6V
V
IH
min=1.2V
V
IH
max=2.0V
(U)SIM card hot plug detection
14
USIM_VDD
PO
For 1.8V (U)SIM:
Vmax=1.9V
Vmin=1.7V
For 3.0V (U)SIM:
Vmax=3.05V
Vmin=2.7V
I
O
max=50mA
(U)SIM power, identify 1.8V or 3V (U)SIM
card automatically
15
USIM_DATA
IO
For 1.8V (U)SIM:
V
IL
max=0.6V
V
IH
min=1.2V
V
OL
max=0.45V
V
OH
min=1.35V
For 3.0V (U)SIM:
V
IL
max=1.0V
V
IH
min=1.95V
V
OL
max=0.45V
V
OH
min=2.55V
(U)SIM data signal
16
USIM_CLK
O
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 clock signal
17
USIM_RST
O
For 1.8V (U)SIM:
V
OL
max=0.45V
V
OH
min=1.35V
For 3.0V (U)SIM:
(U)SIM reset signal
