Neoway WM620 - Figure 3-14 Recommended ESD Diode Array; Figure 3-15 Reference of SIM Card Socket

WM620 Hardware User Guide
Copyright © Neoway Technology Co., Ltd
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Figure 3-14 Recommended ESD diode array
If 6-pin SIM card sockets are used, MCP-C713(H2.8) is recommended. Figure 3-15 shows its
encapsulation.
Figure 3-15 Reference of SIM card socket
The pins of USIM card socket:
Pin 1 USIM_CLK
Pin 2 USIM_ DATA
Pin 3 USIM_RST
Pin 4 USIM_VPP
Pin 5 USIM_VCC
Pin 6 GND
USIM signals are sensitive to RF interference. Therefore, it is recommended to add high-performance
ESD components if required.
The PCB design should meet the following requirements:
 Avoid bifurcation at PCB trace of SIM_CLK.
 Ensure as short PCB traces of USIM_DATA and USIM CLK as possible and surround the traces
with GND copper.
 RF traces or RF connector should be far away from the USIM card and USIM card traces.
L1
GND
L2
L3
L4
1
2
3
4
5
USIM_RST
USIM_CLK
USIM_DATA
USIM_VCC