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SIM7600E_SIM7600E-H-PCIE_Hardware_Design_V1.00 21 2017-11-23
Module
100nF
SIM Socket
VCC
GND
RST
VPP
CLK I/O
GND
USIM_VDD
USIM_RST
USIM_CLK
USIM_DATA
NM
PRESENCE
USIM_DET
22ohm
22ohm
22ohm
22ohm
Figure 11: USIM interface reference circuit with detection function
If the USIM card detection function is not used, user can keep the USIM_DET pin open. The reference circuit
of 6-pin USIM card holder is illustrated in the following figure.
Module
100nF
SIM Socket
VCC
GND
RST
VPP
CLK I
/O
USIM_VDD
USIM_RST
USIM_CLK
USIM_DATA
NM
USIM_DET
22ohm
22ohm
22ohm
Figure 12: USIM interface reference circuit
Note: USIM_DATA has been pulled up with a 10KΩ resistor to USIM_VDD in module. A 100nF capacitor
on USIM_VDD is used to reduce interference.
Note: USIM_CLK is very important signal; customer must make sure the rise time and fall time of
USIM_CLK less than 40ns!