U)Sim Interfaces - Quectel LTE-A Series Hardware Design

3.8. (U)SIM Interfaces

EG18 provides two (U)SIM interfaces. The circuitry of (U)SIM interfaces meets ETSI and IMT-2000
requirements. Both 1.8V and 3.0V (U)SIM cards are supported. Dual SIM Single Standby function is
supported and (U)SIM card switching is enabled by AT+QUIMSLOT command. For more details about
this command, please refer to document [3].
Table 10: Pin Definition of the (U)SIM Interfaces
Pin Name Pin No.
USIM1_DET 25
USIM1_VDD 26
USIM1_CLK 27
USIM1_RST 28
USIM1_DATA 29
USIM2_VDD 74
USIM2_DATA 77
USIM2_DET 78
USIM2_RST 79
USIM2_CLK 80
EG18 supports (U)SIM card hot-plug via USIM_DET pins. The function supports low level and high level
detections, and is disabled by default. Please refer to document [3] for more details about AT+QSIMDET
command.
EG18_Hardware_Design
I/O Description
DI (U)SIM1 card insertion detection
PO Power supply for (U)SIM1 card
DO Clock signal of (U)SIM1 card
DO Reset signal of (U)SIM1 card
IO Data signal of (U)SIM1 card
PO Power supply for (U)SIM2 card
IO Data signal of (U)SIM2 card
DI (U)SIM2 card insertion detection
DO Reset signal of (U)SIM2 card
DO Clock signal of (U)SIM2 card
LTE-A Module Series
EG18 Hardware Design
Comment
Either 1.8V or 3.0V is supported
by the module automatically.
Either 1.8V or 3.0V is supported
by the module automatically.
If (U)SIM2 interface is unused,
keep it open.
If (U)SIM2 interface is unused,
keep it open.
If (U)SIM2 interface is unused,
keep it open.
If (U)SIM2 interface is unused,
keep it open.
If (U)SIM2 interface is unused,
keep it open.
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