Gemalto M2M GmbH MC56 User Manual

MC55/56 Hardware Interface Description 
Confidential / Preliminary 

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MC55/56_hd_v03.00 

Page 60 of 104 

16.08.2005 

The schematic below is a sample configuration that illustrates the Molex SIM card holder 
located on the DSB45 Support Box (evaluation kit used for type approval of the Siemens 
MC55/56 reference setup, see [5]). X503 is the designation used for the SIM card holder in 
[5].  
 

 

Figure 20: SIM card holder of DSB45 Support Box 

Table 16: Pin assignment of Molex SIM card holder on DSB45 Support Box 

1 

CCVCC 

I 

Supply voltage for SIM card, generated by the GSM engine 

2 

CCRST 

I 

Chip card reset, prompted by the GSM engine 

3 

CCCLK 

I 

Chip card clock 

4 

CCGND 

- 

Individual ground line for the SIM card to improve EMC 

5 

CCVPP 

- 

Not connected 

6 

CCIO 

I/O 

Serial data line, bi-directional 

7 

CCDET1 

- 

Connect to CCVCC  

8 

CCDET2 

 

Connects to the CCIN input of the GSM engine. Serves to 
recognize whether a SIM card is in the holder.  

 

Pins 1 through 8 (except for 5) are the minimum 
requirement according to the GSM Recommendations, 
where pins 7 and 8 are needed for SIM card tray 
detection through the CCIN pin.  
 
 
 
 

Figure 21: Pin numbers of Molex SIM card holder on DSB45 
Support Box 

 
Place the capacitors C1205 and C1206 (or instead one capacitor of 200nF) as close as 
possible to the pins 1 (CCVCC) and 4 (GND) of the card holder. Connect the capacitors to 
the pins via low resistance tracks.