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3.8.2 SIM Design Guidelines
The SIM interface and signals design is extremely important for proper operation of module 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.
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 module 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_DATA), 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 recommended part no of ESD isAVR-M1005C270MAAB (TDK) We also
recommended the ESD component should layout with SIM hold closely.
3.9 Audio Interface
The module audio interface supports two channel audio devices and operating modes. The audio
interface's operating modes, active devices, amplification levels and speech processing algorithms are
fully controlled by the host application, through advanced programming options and a versatile AT
commands set.
G510 Hardware User Manual
Figure 3- 10 SIM card reference design
Page 27 of 42
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