LTE-A Module Series
EM12-G Hardware Design
EM12-G_Hardware_Design 29 / 62
Table 8: Pin Definition of (U)SIM Interfaces
EM12-G supports (U)SIM card hot-plug via the USIM_DET pin, which is a level trigger pin. The
USIM_DET is normally short-circuited to ground when (U)SIM card is not inserted. When the (U)SIM card
is inserted, the USIM_DET will change from low to high level. The rising edge will indicate insertion of the
(U)SIM card. When the (U)SIM card is removed, the USIM_DET will change from high to low level. This
falling edge will indicate the absence of the (U)SIM card.
The following figure shows a reference design of (U)SIM interface with normally short-circuited (U)SIM
card connector.
Pin Name
Pin No.
I/O
Description
Comment
USIM1_VDD
36
PO
Power supply for (U)SIM1
card
Either 1.8V or 3.0V is supported
by the module automatically.
USIM1_DATA
34
IO
Data signal of (U)SIM1 card
USIM1_CLK
32
DO
Clock signal of (U)SIM1 card
USIM1_RESET
30
DO
Reset signal of (U)SIM1 card
USIM1_DET
66
DI
(U)SIM1 card insertion
detection.
Active high.
Pulled up internally.
When (U)SIM1 card is present, it
is at high level.
When (U)SIM1 card is absent, it is
at low level.
USIM2_VDD
48
PO
Power supply for (U)SIM2
card
Either 1.8V or 3.0V is supported
by the module automatically.
USIM2_DATA
42
IO
Data signal of (U)SIM2 card
USIM2_CLK
44
DO
Clock signal of (U)SIM2 card
USIM2_RESET
46
DO
Reset signal of (U)SIM2 card
USIM2_DET
40
DI
(U)SIM2 card insertion
detection.
Active high.
Pulled up internally.
When (U)SIM2 card is present, it
is at high level.
When (U)SIM2 card is absent, it is
at low level.
