Motorola Mobility LLC T56KT1 User Manual

 illustrates a typical external SIM interface connection to G30. This connection type is 

implemented on the G30 Developer Board, using an FCI SIM tray, PN 7111S1615A05.

The SIM interface and signals design is extremely important for proper operation of G30 and the 
SIM card. There are several design guidelines that must be followed to achieve a robust and 
stable design that meets the required standards and regulations.

Using the SIM detection signal, SIM_PD_N, is mandatory in case the SIM card is accessible 
to the user and may be removed during G30 operation. To avoid any damage to the SIM or 
G30, the SIM interface signals must be deactivated before the SIM card contacts are 
mechanically removed from the SIM tray contacts. Therefore, the SIM_PD_N detection 
signal must be disabled before the SIM is removed from its tray.

The SIM should be located, and its signals should be routed, away from any possible EMI 
sources, such as the RF antenna and digital switching signals.

The SIM interface signals length should not exceed 100 mm between the G30 interface 
connector and the SIM tray. This is to meet with EMC regulations and improve signal 
integrity.

To avoid crosstalk between the SIM clock and data signals (SIM_CLK and SIM_DIO), it is 
recommended to rout them separately on the application board, and preferably isolated by a 
surrounding ground plane.

The SIM card signals should be protected from ESD using very low capacitance protective 
elements (zener diodes, etc.).

The G30 interface does not support SIM programming through the VPP signal. This signal 
should not be connected to G30.