Specifications

WM_PRJ_Q2400_PTS_002 - 002
24th January 2003
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2.9 SIM interface
2.9.1 General Description
5 signals exist :
•
SIMVCC : SIM power supply.
•
SIMRST : reset.
•
SIMCLK : clock.
•
SIMDATA : I/O port.
•
SIMPRES : SIM card detect.
The SIM interface controls a 3V SIM (and a 5V SIM through an external SIM
driver). This interface is fully compliant with GSM 11.11 recommendations
concerning SIM functions.
It is recommended to add Transient Voltage Suppressor diodes on the signal
connected to the SIM socket in order to prevent any ElectroStatic Discharge.
TVS diodes with low capacitance (less than 10pF) have to be connected on
SIMCLK and SIMDATA to avoid any disturbance of the rising and falling edge.
These types of diodes are mandatory for the Full Type Approval. They shall be
placed as close as possible to the SIM socket.
The following references can be used : DALC208SC6 from ST Microelectronics.
Pin description
Signal Pin number I/O I/O type Description
SIMCLK 3 O 2X SIM Clock
SIMRST 5 O 2X SIM Reset
SIMDATA 7 I/O CMOS / 3X SIM Data
SIMVCC 9 O SIM Power Supply
SIMPRES 50 I CMOS SIM Card Detect