DSB45 Development Support Box
Confidential / Released
s
DSB45_HD_V05
Page 15 of 50
01.02.2008
2.6
SIM card interface X507
The DSB45 has an integrated SIM card interface (X503). An appropriate SIM card is required
to operate the GSM module. MC55i supports 3V and 1.8V SIMs, all other modules listed in
Chapter 1.1 support only 3V SIMs.
The SIM card holder placed on the DSB45 PCB is from Molex. To open the SIM card holder
press the yellow pin.
In parallel to the SIM card holder X503, the test points X501 are connected.
In parallel to the recognition switch (holder pins 7 and 8) there is a simple switch
CCIN_CONT (X507) connected. It is switched off during normal operation.
Note: In order to ensure compliance with EMC and SIM specifications, it is recommended
that the total cable length between the GSM module and the SIM card holder does not
exceed 200mm.
Table 4: Pin assignment – Molex SIM card holder X503 and test points X501
Pin no
holder
Pin no
test points
Designation
I/O
Function
1
1
CCVCC
O
Supply voltage for SIM card, generated by the
GSM module.
2
2
CCRST
O
Chip card reset, prompted by the GSM module.
3
3
CCCLK
O
Chip card clock
4 4,5,7 CCGND
-
Individual
ground
line
for the SIM card to improve
EMC
5 -
CCVPP
-
Not
connected
6
6
CCIO
I/O
Serial data line, bi-directional
7
-
CCDET2
Connects to CCIN input of the GSM module for
recognition of SIM in the holder. If the SIM card is
removed during operation, signals to the card are
immediately shut down in the recommended way
in order to prevent damage to the card.
8
8
CCDET1
-
Connects to CCVCC or 2.9V on the PCB, see
Figure 3 (depends on switch CCIN_VOLT X504)
Note: MC55i must only be operated with X504 set
to CCVCC (factory default of DSB45).
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 6: Pin numbers of Molex SIM card holder on DSB45
Support Box
4
5
1
2
7
8
3
6
