SYSTEM CONNECTOR INTERFACE
42
LZT 123 8020 R1A
Note!
The distance between the SIM card holder and the radio device
can be up to 25cm.
This SIM interface allows the use of 3 V and 5 V SIM cards. By
default it works on 3 V levels but will automatically switch to 5 V,
if a 5 V SIM card is fitted.
SIM voltage levels, as shown in the following table, are
dependent on the type of SIM card detected by the radio
device.
Signal Parameter
Mode
Min.
Typ.
Max.
Unit
3 V
2.7
3.0
3.3
V
SIMVCC
SIM supply voltage
5 V
4.5
5.0
5.5
V
3 V
2.1
3.0
V
SIMDAT
High Level Input voltage
(V
IH
)
5 V
3.5
5.0
V
3 V
0
0.9
V
SIMDAT
Low Level Input voltage
(V
IL
)
5 V
0
1.5
V
3 V
2.7
3.0
V
SIMDAT
High Level Output
voltage (V
OH
)
5 V
4.7
5.0
V
3 V
0
0.2
V
SIMDAT
Low Level Output
voltage (V
OL
)
5 V
0
0.2
V
3 V
2.4
3.0
V
SIMCLK
SIMRST
High Level Output
voltage (V
OH
)
5 V
4.4
5.0
V
3 V
0
0.35
V
SIMCLK
SIMRST
Low Level Output
voltage (V
OL
)
5 V
0
0.3
V
5.10.1
SIM Detection - SIMPRESENCE
SIMPRESENCE is used to determine whether a SIM card has
been inserted into or removed from the SIM card holder. You
should normally wire it to the “card inserted switch” of the SIM
card holder, but different implementations are possible.
When left open, an internal pull-up resistor maintains the signal
high and means “SIM card missing” to the radio device. When
pulled low the radio device assumes a SIM card is inserted.
SIMPRESENCE is a Digital 2.75V CMOS input with the
following electrical characteristics.
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