Sim Interface; Table 12: Signals Of The Sim Interface (Board-To-Board Connector) - Siemens AC75 Hardware Interface Description

AC75 Hardware Interface Description
Strictly confidential / Preliminary
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 (board-to-board connector) in order to be
connected to an external SIM card holder. Six pins on the board-to-board connector are
reserved for the SIM interface.
The SIM interface supports 3V and 1.8V SIM cards. Please refer to Table 26 for electrical
specifications of the SIM interface lines depending on whether a 3V or 1.8V SIM card is
used.
The CCIN pin serves to detect whether a tray (with SIM card) is present in the card holder.
Using the CCIN pin 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
operation. 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 tested to operate with AC75 and is part of the Siemens reference equipment
submitted for type approval. See Chapter 8 for Molex ordering numbers.

Table 12: Signals of the SIM interface (board-to-board connector)

Signal Description
CCGND Separate ground connection for SIM card to improve EMC.
Be sure to use this ground line for the SIM interface rather than any other ground pin or
plane on the module. A design example for grounding the SIM interface is shown in
Figure 46.
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 pin is active low.
The CCIN pin is mandatory for applications that allow the user to remove the SIM card
during operation.
The CCIN pin 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
AC75.
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 initializing any SIM card that the user
inserts after having removed a SIM card during operation. In this case, the application
must restart AC75.
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