MC45 Hardware Interface Description
P R E L I M I N A R Y
MC45_HD_01_V00.02a Page 53 of 90 12.08.2002
3.7 SIM interface
The baseband processor has an integrated SIM interface compatible with the ISO 7816-3 IC
Card standard. This is wired to the host interface (board-to-board connector) in order to be
adapted to an external SIM card holder. Six pins on the board-to-board connector are
reserved for the SIM interface. Further to the five wire SIM interface according to GSM
11.11, the CCIN pin has been added. The CCIN pin serves to detect mechanically whether
or not a card is present in the card holder.
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 Deutschland GmbH,
which has been tested to operate with MC45 and is part of the Siemens reference setup for
type approval (Molex ordering number 91228-0001).
It is recommended that the total cable length between the board-to-board connector pins on
MC45 and the pins of the card holder does not exceed 200 mm in order to meet the
specifications of 3GPP TS 51.010-1 and to satisfy the requirements of EMC compliance.
Note: Before removing the SIM card or inserting a new one be sure that the GSM engine
has been powered down as described in Chapter 3.3.3.1. Otherwise, you run the risk
of causing damage to the card, or losing data stored on the card.
Table 13: Signals of the SIM interface (board-to-board connector)
Signal name Description
CCCLK Chipcard clock, various clock rates can be set in the baseband processor.
CCVCC SIM supply voltage from PSU-ASIC
CCIO Serial data line, input and output.
CCRST Chipcard reset, provided by baseband processor.
CCIN Input on the baseband processor for detecting the SIM card in the holder; if the SIM
card is removed during operation the SIM interface shuts down immediately. This
function is implemented to prevent destruction of the SIM card. Nevertheless,
inserting or removing the SIM card during operation should be avoided (see Note
above).
IMPORTANT: 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 MC45.
CCGND Separate ground connection for SIM card to improve EMC.
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