LZT 123 1836
59
5.11.6
SIM Card Interface
Pin
Name
Direction
Function
14 SIMVCC Output 1.8V
or 3.0V SIM card supply
15
SIMRST
Output
SIM card reset signal
16
SIMCLK
Output
SIM card clock signal
17
SIMDAT
In/Out
SIM card data
18
SIMDET
Input
SIM presence detection
This interface allows the user to communicate with the smart (SIM) card in the user
application. The GS64 offers alternative arrangements for accessing the SIM
depending on which variant of the GS64 is used. Both variants provide this interface
through the system connector, referred to as the
external or remote SIM interface to
distinguish it from the integrated SIM interface.
The maximum distance between the SIM card holder and the wireless modem is
70cm. SIM holders placed further than this distance may not meet the SIM interface
performance specification.
This SIM interface allows the use of 3 V and 1.8 V SIM cards. The module does not
support 5V SIM cards. The wireless modem automatically detects the SIM type,
switching the signal voltages accordingly. SIM voltage levels, as shown in the
following table, are dependent on the type of SIM card detected by the wireless
modem.
Signal Parameter
Mode
Min
Typ
Max
Unit
1.8V
1.71 1.8 1.89 V
SIM supply voltage
3.0V
2.75 2.9 3.05 V
Short circuit current
10
50
mA
Quiescent Supply Current
3.0V
20
µ
A
Output Capacitance
0.3
2
µ
F
SIMVCC
Output Capacitor ESR
0.01
1.0
Ω
1.8V
0.7xSIMVCC V
High level input voltage (V
IH
)
3.0V
0.7xSIMVCC V
1.8V 0.2xSIMVCC
V
Low level input voltage (V
IL
)
3.0V
0.4 V
1.8V 0.8xSIMVCC
V
High level output voltage (V
OH
)
3.0V 0.8xSIMVCC
V
1.8V
0.4
V
SIMDAT
Low level output voltage (V
OL
)
3.0V
0.4
V
