Figure 9: Example Of 1.8 V / 3 V Sim Interface Implementation - Wavecom WISMO Quik Q2406 Customer Design Manuallines

2.2.6.2 SIM 1.8 V / 3 V management
It is possible to manage 1.8 V and 3 V SIM cards using an external level shifter
device (see Figure below).
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 (1.8 V or 3 V).
As for 3 V SIM, it is recommended to add Transient Voltage Suppressors on the
signals connected to the SIM socket (refer to Figure 9).
Typical implementation:
SIM_CLK
SIM_RST
SIM_DATA
VCC
GPO0
WISMO
SIM_VCC
Q2400
SIM_PRES
M0
0V
0V
DVCC
DVCC
DVCC

Figure 9: Example of 1.8 V / 3 V SIM interface implementation

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This document is the sole and exclusive property of WAVECOM. Not to be
distributed or divulged without prior written agreement.
VCC
2.8 V
LEVEL SHIFTER
1
CIN
2
RIN
3
DATA
4
DDRV
5
DVCC
6
M2
7
M1
8
M0
LTC1555L-1.8
Truth
DVCC = 2.8 V
table:
M1 M2 Operating Mode
0V 0V or DVCC Shutdown (VCC = 0V)
DVCC 0V or DVCC VCC = VIN
0V
0V
VCC = 3 V
0V DVCC
VCC = 1.8 V
DVCC 0V or DVCC VCC = 5 V
All rights reserved
WM_PRJ_Q2400_PTS_005 -007
VCC
2.8 V
1 Ω
to
4.7 Ω
16
CLK
15
RST
14
I/O
13
VCC
12
VIN
11
C1+
10
C1-
9
GND
18th January 2006
SIM
Socket
3
CLK
2
RST
7
I/O
1
VCC = 1.8 V or 3 V
IVCC = 10 mA
6
VPP
4 CC4
8 CC8
5
GND
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