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Integra M2106+
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This document is the sole and exclusive property of Wavecom. Not to be distributed or divulged without prior written
agreement.
WA_DE_PTS_003-001
April, 2007
3.14.2
External SIM Card Interface
The external SIM interface is available through the General Purpose Connector in order to use a stand-alone
SIM card holder. This interface is 3V / 1V8, but
5 V SIMs can be driven by using an external level shifter.
See the application schematics in section 6.3.
Each SIM line must not exceed a length of 10 cm on the application PCB.
Although an internal ESD protection inside the Integra M2106+, there is a certain distance between the
internal ESD protection circuitry and the external SIM card holder. This distance gives the electrostatic effect
to other digital signals around.
Wavecom recommends adding Transient Voltage Suppressor diodes (ESD diode) on the external SIM
signals, which are placed near to the external SIM socket. TVS diodes with low capacitance (less than
10 pF) are used on SIMCLK and SIMDATA to avoid any disturbance of the rising and falling edges.
Pin description
Signal
Pin #
I/O
Reset state
I/O type
Description
SIM_CLK 45 O Output
low 2V9/1V8
SIM Clock
SIM_RST 46 O Output
low 2V9/1V8
SIM Reset
SIM_DATA 49 I/O Output
low 2V9/1V8
SIM Data
SIM_VCC 47 O
--
2V9/1V8
Supply
SIM Power Supply
SIM_PRES 48 I
High
Z
2V8
CMOS
SIM Card Detect
GPO0 50
O
Output
high 2V8
3X
SIM 3 V or 5 V