Technical information

SIM Interface
24 G24-L Module Hardware Description November 15, 2008
SIM Connection
Figure 2-13 illustrates a typical SIM interface connection to G24-L. This connection type is
implemented on the G24-L Developer Board, using an FCI SIM tray, PN 7111S1615A05.
Figure 2-13: G24-L SIM Interface
Table 2-5 details the SIM interface signals.
SIM Design Guidelines
The SIM interface and signals design is important for proper operation of G24-L and the SIM
card. Below are several design guidelines that must be followed to achieve a robust and stable
design that meets the required standards and regulations.
• Two 100nF low ESR capacitors must be placed, in parallel, on the SIM_VCC signal line.
The capacitors should be located as near as possible to the SIM card tray contacts.
The capacitors value may slightly change depending on the application design.
• A 56Ω series resistor must be placed on the SIM_DIO signal line.
The resistor value may slightly change depending on the application design.
Table 2-5:
SIM Interface Signals
Pin # Signal Name Description
48 SIM_VCC 2.85V/1.80V Supply to the SIM
44 SIM_RST_N Active low SIM reset signal
52 SIM_DIO Serial input and output data
46 SIM_CLK Serial 3.25 MHz clock
50 SIM_PD_N Active low SIM card presence
detection