Motorola AT Commands G24-L Información técnica descargar pdf (Pagina 50)

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

1 2 ... 45 46 47 48 49 50 51 52 53 54 55 ... 105 106

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Motorola AT Commands G24-L Información técnica Pagina 50