MC55i Terminal Hardware Interface Description
3.8 SIM Interface
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MC55i_Terminal_HD_v01.201a Page 29 of 47 2010-04-16
Confidential / Released
3.8 SIM Interface
The SIM interface is intended for 1.8V and 3V SIM cards in accordance with GSM 11.12 Phase
2. The card holder is a five wire interface according to GSM 11.11. A sixth pin has been added
to detect whether or not a SIM card is inserted.
Figure 8: SIM interface
All signals of the SIM interface are protected from electrostatic discharge with spark gaps to
GND and clamp diodes to 1.8V resp. 2.9V and GND.
Removing and inserting the SIM card during operation requires the software to be reinitialized.
Therefore, after reinserting the SIM card it is necessary to restart MC55i Terminal.
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 the MC55i Terminal.
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