LTE-A Module Series
EG18 Hardware Design
EG18_Hardware_Design 44 / 104
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
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.
Pin Name
Pin No.
I/O
Description
Comment
USIM1_DET
25
DI
(U)SIM1 card insertion detection
USIM1_VDD
26
PO
Power supply for (U)SIM1 card
Either 1.8V or 3.0V is supported
by the module automatically.
USIM1_CLK
27
DO
Clock signal of (U)SIM1 card
USIM1_RST
28
DO
Reset signal of (U)SIM1 card
USIM1_DATA
29
IO
Data signal of (U)SIM1 card
USIM2_VDD
74
PO
Power supply for (U)SIM2 card
Either 1.8V or 3.0V is supported
by the module automatically.
If (U)SIM2 interface is unused,
keep it open.
USIM2_DATA
77
IO
Data signal of (U)SIM2 card
If (U)SIM2 interface is unused,
keep it open.
USIM2_DET
78
DI
(U)SIM2 card insertion detection
If (U)SIM2 interface is unused,
keep it open.
USIM2_RST
79
DO
Reset signal of (U)SIM2 card
If (U)SIM2 interface is unused,
keep it open.
USIM2_CLK
80
DO
Clock signal of (U)SIM2 card
If (U)SIM2 interface is unused,
keep it open.
