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Module
GND
USIM_VDD
USIM_RST
USIM_CLK
USIM_PRESENCE
USIM_DATA
Figure 4: Reference Circuit of (U)SIM Interface with an 8-pin (U)SIM Card Connector
If (U)SIM card detection function is not needed, please keep USIM_PRESENCE unconnected. A
reference circuit for (U)SIM interface with a 6-pin (U)SIM card connector is illustrated in the following
figure.
Module
GND
USIM_VDD
USIM_RST
USIM_CLK
USIM_DATA
Figure 5: Reference Circuit of (U)SIM Interface with a 6-pin (U)SIM Card Connector
In order to enhance the reliability and availability of the (U)SIM card in customers' applications, please
follow the criteria below in (U)SIM circuit design:
Keep placement of (U)SIM card connector to the module as close as possible. Keep the trace length
as less than 200mm as possible.
Keep (U)SIM card signals away from RF and power supply traces.
EG21-G_Mini_PCIe_Hardware_Design
USIM_VDD
0R
0R
0R
33pF
USIM_VDD
15K
0R
0R
0R
33pF 33pF 33pF
GND
EG21-G Mini PCIe Hardware Design
15K
33pF 33pF
GND
GND
(U)SIM Card Connector
VCC
RST
CLK
GND
LTE Standard Module Series
100nF
(U)SIM Card Connector
VCC
GND
RST
VPP
IO
CLK
GND
100nF
GND
VPP
IO
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