RIM 1802G, Integrator Manual

Page: 51 / 76

SIM interface pins
Integrator Guide 51
SIM interface pins
This section describes the purpose of each of the 6 lines that comprise the SIM interface to the RIM
1902G or RIM 1802G, with the off-board SIM card configuration. All SIM interface lines are 3V. The
RIM 1902G or RIM 1802G software polls the SIM card to confirm its presence.
The following diagram shows an example of how the SIM was incorporated onto the RIM Interface
and Test Board:
Note: The SIM interface pins only appear on models with off-board SIM cards.
Note: For proper operation, the SIM connector cable should be no more than 10 cm long.
The VPP line on the SIM card connector can be shorted with the VCC line to continue proper operation.
Pin Description
1 VCC.
This line supplies the SIM card with power. Verify that it leads to the VCC pin of the SIM card connector.
It might be necessary to filter noise on the line to prevent a fault from occurring. Refer to the following
diagram for an example.
2 Reset.
This is an output from the radio. Verify that it leads to the reset pin of the SIM card connector.
3 Clock.
This is an output from the radio. Verify that it leads to the clock pin of the SIM card connector.
4 Input/Output.
This is a two-way line between the SIM card connector and the RIM 1902G or RIM 1802G. Verify that it
leads to the I/O pin of the SIM card connector.
5 SIM Detect.
The active state of this line is high. This line should be asserted so that the radio modem can detect the
SIM card.
6 Ground.
This is an input to the radio. Short this line to the GND pin of the SIM card connector.