Quectel LTE-A Module Series Hardware Design page 36

Normally Open (U)SIM Card Connector:
⚫
When the (U)SIM is absent, CD is open to SW and USIM_DET is at low level.
⚫
When the (U)SIM is inserted, CD is short-circuited to SW and USIM_DET is at high level.
If (U)SIM card detection function is not needed, keep USIM_DET unconnected. The following figure
shows a reference circuit for a (U)SIM card interface with a 6-pin (U)SIM card connector.
USIM_VDD
USIM_RST
Module
USIM_CLK
USIM_DATA
Figure 19: Reference Circuit of a 6-Pin (U)SIM1 Card Connector
EM120R-GL&EM160R-GL provide two (U)SIM interfaces. (U)SIM1 interface is used for external (U)SIM
card only, and (U)SIM2 interface is used for external (U)SIM card or internal eSIM card.
It should be noted that, when (U)SIM2 interface is used for an external (U)SIM card, the reference circuits
are the same as those of (U)SIM1 interface. When (U)SIM2 interface is used for the internal eSIM card,
pins 40, 42, 44, 46 and 48 of the module must be kept open.
EM120R-GL&EM160R-GL_Hardware_Design
EM120R-GL&EM160R-GL Hardware Design
USIM_VDD GND
15K
100 nF
(U)SIM Card Connector
22R
22R
22R
33 pF 33 pF 33 pF
GND GND
LTE-A Module Series
VCC GND
RST VPP
CLK IO
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