Specifications

WM_PRJ_Q2400_PTS_001 - 003
6th November 2002
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Note
:
When not used SIMPRES has to be tied to VCC.
When used, a low to high transition means that the SIM card is inserted and a
high to low transition means that the SIM card is removed.
2.8.2 SIM socket connection
SIM socket pin description
Signal Pin number Description
VCC 1 SIMVCC
RST 2 SIMRST
CLK 3 SIMCLK
CC4 4 VCC module
GND 5 GROUND
VPP 6 Not connected
I/O 7 SIMDATA
CC8 8
SIMPRES with 100k
Ω
pull
down resistor
SIMVCC 1
SIMRST 2
SIMCLK 3
SIMDATA 7
SIMPRES 8
VCC
RST
CLK
CC4
GND
VPP
I / O
CC8
GND
VCC 4
5
GND
100 k
Ω
C
Figure 2 : SIM socket
The capacitor placed on the Sim Vcc must not exceed 470nF.
2.8.3 SIM 3/5V management
The WISMO Quik Q2403 Series module is designed to interface with 3V SIMs
only
2
.
Nevertheless, it is possible to manage 3V and 5V SIMs using an external level
shifter (see application notes in appendix). In this case, depending on the type
of SIM detected, the module firmware triggers the GPO0 output signal (pin
#26) in order to properly set the external SIM driver level (3V or 5V).
2
Most of the GSM operators have been providing 3V SIMs since 1998.