User's Manual
Table Of Contents
- Contents
- Figures
- Tables
- Document History
- Introduction
- Product concept
- Application Interface
- Antenna interface
- Electrical, reliability and radio characteristics
- Mechanics
- Reference Approval
- List of parts and accessories
MC46 Hardware Interface Description
DRAFT
MC46_HD_V02.8xb Page 56 of 98 21.08.2003
3.11.1 Requirements for using the CCIN pin
SIM card is removed during operation. Therefore, the signal at the CCIN pin must go low
before the SIM card contacts are mechanically detached from the SIM interface contacts.
This shut-down procedure is particularly required to protect the SIM card as well as the SIM
interface of MC46 from damage.
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 MC46 and is
part of the Siemens reference equipment submitted for type approval. Molex ordering
number is 91228-0001, see also Chapter 8.
The module’s startup procedure involves a SIM card initialization performed within 1 second
after getting started. An important issue is whether the initialization procedure ends up with a
high or low level of the CCIN signal:
a) If, during startup of MC46, the CCIN signal on the SIM interface is high, then the status
of the SIM card holder can be recognized each time the card is inserted or ejected.
A low level of CCIN indicates that no SIM card tray is inserted into the holder. In this
case, the module keeps searching, at regular intervals, for the SIM card. Once the SIM
card tray with a SIM card is inserted, CCIN is taken high again.
b) If, during startup of MC46, the CCIN signal is low, the module will also attempt to
initialize the SIM card. In this case, the initialization will only be successful when the
card is present.
If the SIM card initialization has been done, but the card is no more operational or
removed, then the module will never search again for a SIM card and only emergency
calls can be made.
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 MC46.
It is strongly recommended to connect the contacts of the SIM card detect switch to the
CCIN input and to the CCVCC output of the module as illustrated in the sample diagram in
Figure 20.
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 a SIM card during operation. In this case, the application
must restart MC46.