Specifications

AC65/AC75 Hardware Interface Description
3.9 SIM Interface
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AC65_AC75_HD_v01.002 Page 50 of 117 2006-10-30
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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 applica-
tion 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 AC65/AC75 and is part of the Siemens reference equipment submitted
for type approval. See Chapter 9 for Molex ordering numbers.
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 the SIM card during operation.
3.9.1 Installation Advice
The total cable length between the board-to-board connector pins on AC65/AC75 and the pins 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 CCGND line to shield the CCIO line from the CCCLK
line.
To meet EMC requirements it is strongly recommended to add several capacitors as shown in Figure 47. Take
care to place the capacitors close to the SIM card holder.
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 47.
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 oper-
ation.
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 AC65/AC75.