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Reference Guide
3.2.1.1.
SIM Socket Pin Description
Refer to the following table for the pin description of the SIM socket.
Table 18.
SIM Socket Pin Description
Pin #
Signal
1
SIMVCC
2
SIMRST
3
SIMCLK
7
SIMDATA
8
SIMPRES
*
SIM-IO pull up is about 10KΩ.
**
SIMPRES pull low is about 100KΩ.
3.2.2.
RF Interface
The USR3500 has three RF interfaces. Refer to the following table for the list of
available RF interfaces.
Table 19.
Available RF Interfaces
Main RF Interface
ü
The main antenna connector allows the transmission of radio frequency (RF) signals
from the device to an external customer supplied antenna. This interface is an SMA
type connector and its nominal impedance is 50Ω.
Figure 22.
Main RF Connector
The secondary RF interface is used in USR3500 for 3G diversity antenna connection.
It is an SMA type connector and its nominal impedance is 50Ω.
I/O
I/O Type
O
2V9 / 1V8
O
2V9 / 1V8
O
2V9 / 1V8
I/O
2V9 / 1V8
I
1V8
Secondary RF
Interface
ü
Rev 1.0
Reset State
Description
SIM Power Supply
O
SIM RESET
O
SIM Clock
Pull up*
SIM DATA
Pull low**
SIM Card Detect
GPS RF Interface
ü
Interfaces
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