User's Manual

WM_PRJ_Q2400_PTS_002 - 004
March 5, 2004
Electrical Characteristics
Parameter Conditions Min Typ Max Unit
SIM_DATA V
IH
I
IH
= ± 20 µA
0.7xSIM_VCC V
SIM_DATA V
IL
I
IL
= 1 mA
0.3xSIM_VCC V
SIM_RST,
SIM_DATA
SIM_CLK V
OH
Source current =
20 µA
SIM_VCC – 0.1V V
SIM_RST,
SIM_DATA
SIM_CLK V
OL
Sink current =
-200 µA
0.1 V
SIM_VCC* Output
Voltage
I
SIMVCC
<= 6 mA
2.70 2.80 2.85 V
SIM_CLK
Rise/Fall Time
Loaded with 30 pF
50 ns
SIM_RST,
SIM_DATA
Rise/Fall Time
Loaded with 30 pF
1 µs
SIM_CLK
Frequency
Loaded with 30 pF
3.25 MHz
(*): given for a 3 V interface. An external SIM driver is needed to handle 5 V SIMs.
Note for SIM_PRES connection
:
• When not used SIM_PRES 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.
2.9.2 SIM 3/5V management
The WISMO Quik Q24x6 sub-series module is designed to interface with 3 V SIMs only
1
.
Nevertheless, it is possible to manage 3 V and 5 V SIM cards using an external level shifter (refer to
customer design guidelines [1]). 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).
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1
Most of the GSM operators have been providing 3 V SIMs since 1998.