January 2001/ version 1.4
WMOi3 Integrated Modem
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4.1.11 SIM interface
The external SIM interface is available through the 50-pin connector in order to
use a stand-alone SIM card holder. This interface is 3V only on the engineeringThis interface is 3V only on the engineering
samples. 5V SIMs can be driven with production unit using an external levelsamples. 5V SIMs can be driven with production unit using an external level
shifter.shifter.
SIM line must not exceed 15 cm. see also “General guidelines” chapter 8
5 signals are available:
SIMVCC: SIM power supply.
SIMRST: reset.
SIMCLK: clock.
SIMDATA: I/O port.
SIMPRES1 SIM card detect. This signal is connected to the external SIM connector
on pin 8. Pin 4 of SIM connector must be pulled down to GND with 1 KΩ.
This interface is fully compliant with GSM 11.11 recommendations concerning
the SIM functionality.
Transient Voltage Suppressor diodes are internally added on the signals connected
to the SIM socket in order to prevent any Electro-Static Discharge. TVS diodes
with low capacitance (less than 10pF) are connected on SIMCLK and SIMDATA to
avoid any disturbance of the rising and falling edge.
Table 22 : SIM interface pin description
Signal Pin number I/O I/O type* Description
SIMCLK 45 O 2X SIM Clock
SIMRST 46 O 2X SIM Reset
SIMDATA 49 I/O CMOS / 3X SIM Data
SIMVCC 47 O SIM Power Supply
SIMPRES1 48 I CMOS SIM Card Detect
GPO0** 50 O 2X SIM 3V or 5V
*See Table 3 “operating conditions” in subdivision 4.1.1The 50-pin
connector description
** for production units
See application schematics in annex for 3V/5V SIM management
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