Sim Interface Schematic; Pin Assignment - Sim Card Holder; Figure 1: Connection Of The Sim Card Holder; Table 1 : Pin Assignment - Sim Card Holder - Siemens TC35 Application

3

SIM Interface Schematic

The following schematic is a sample configuration that illustrates how the SIM card holder of
the DSB35 Support Box connects to the TC35 GSM engine.
Note :
•
To ensure EMC compliance, only a maximum line length of 200 mm is permitted
between the GSM engine and the SIM card holder.
•
The switch (X1202) is only for developing if you need a simulating of an empty SIM card
holder.
4

Pin assignment - SIM card holder

Table 1 : Pin assignment - SIM card holder

Pin no. Designation
1 CCVCC
2 CCRST
3 CCCLK
4 CCGND
5 CCVPP
6 CCIO
7 CCDET1
8 CCDET2
GSM Engine TC35
TC35-AN-01-V00.04
Application Note

Figure 1: Connection of the SIM card holder

I/O Function
I Supply voltage for SIM card, generated by the GSM engine
I Chip card reset, prompted by the GSM engine
I Chip card clock
- Individual ground line for the SIM card to improve EMC
- Not connected
I/O Serial data line, bi-directional
- Connect to CCVCC (see Figure 1)
Connects to the CCIN input of the GSM engine. Serves to
recognise whether a SIM card is in the holder. Removing the
SIM card during operation will immediately stop further
transmission of signals to the card to protect the card from
damage.
Released
5/9
Application Note SIM Interface
Version 03.00