EES3 Hardware Interface Description
3.9 SIM Interface
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EES3_HD_v01.100b
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2009-08-12
Confidential / Released
3.9
SIM Interface
The baseband processor has an integrated SIM interface compatible with the ISO 7816 IC
Card standard. This is wired to the host interface in order to be connected to an external SIM
card holder. Six pads on the SMT application interface are reserved for the SIM interface.
The SIM interface supports 3V and 1.8V SIM cards. Please refer to
ifications of the SIM interface lines depending on whether a 3V or 1.8V SIM card is used.
The CCIN signal serves to detect whether a tray (with SIM card) is present in the card holder.
Using the CCIN line is mandatory for compliance with the GSM 11.11 recommendation if the
mechanical design of the host application allows the user to remove the SIM card during oper-
ation. To take advantage of this feature, an appropriate SIM card detect switch is required on
the card holder. For example, this is true for the model supplied by Molex, which has been test-
ed to operate with EES3 and is part of the Cinterion Wireless Modules reference equipment
submitted for type approval. See
for Molex ordering numbers.
The total cable length between the SMT application interface pads on EES3 and the connector
of the external SIM card holder must not exceed 100mm in order to meet the specifications of
3GPP TS 51.010-1 and to satisfy the requirements of EMC compliance.
To avoid possible cross-talk from the CCCLK signal to the CCIO signal be careful that both
lines are not placed closely next to each other. A useful approach is using the GND line to
shield the CCIO line from the CCCLK line.
Note: No guarantee can be given, nor any liability accepted, if loss of data is encountered after
removing the SIM card during operation. Also, no guarantee can be given for properly initializ-
ing any SIM card that the user inserts after having removed a SIM card during operation. In this
case, the application must restart EES3.
Table 14:
Signals of the SIM interface (SMT application interface)
Signal
Description
CCGND Separate ground connection for SIM card to improve EMC.
A design example for grounding the SIM interface is shown in
CCCLK
Chipcard clock, various clock rates can be set in the baseband processor.
CCVCC SIM supply voltage.
CCIO
Serial data line, input and output.
CCRST
Chipcard reset, provided by baseband processor.
CCIN
Input on the baseband processor for detecting a SIM card tray in the holder. If the SIM is
removed during operation the SIM interface is shut down immediately to prevent destruction
of the SIM. The CCIN line is active low.
The CCIN signal is mandatory for applications that allow the user to remove the SIM card
during operation.
The CCIN signal is solely intended for use with a SIM card. It must not be used for any other
purposes. Failure to comply with this requirement may invalidate the type approval of EES3.
