Quectel LTE-A Series Hardware Design page 46

The following figure shows a reference design for a (U)SIM interface with an 8-pin (U)SIM card connector.
USIM_VDD
USIM_RST
Module
USIM_CLK
USIM_DET
USIM_DATA
Figure 18: Reference Circuit of a (U)SIM Interface with an 8-Pin (U)SIM Card Connector
If (U)SIM card detection function is not needed, please keep USIM_DET pins unconnected. A reference
circuit for a (U)SIM interface with a 6-pin (U)SIM card connector is illustrated by the following figure.
USIM_VDD
USIM_RST
Module
USIM_CLK
USIM_DATA
Figure 19: Reference Circuit of a (U)SIM Interface with a 6-Pin (U)SIM Card Connector
EG18_Hardware_Design
VDD_EXT USIM_VDD
51K
15K
22R
22R
22R
NM
USIM_VDD
15K
22R
22R
22R
NM
NM
100nF
NM NM
GND
100nF
(U)SIM Card Connector
NM
GND
LTE-A Module Series
EG18 Hardware Design
(U)SIM Card Connector
VCC GND
RST VPP
IO
CLK
CD1 CD2
VCC GND
RST VPP
CLK IO
45 / 104
GND