LTE Standard Module Series
EG915U_Series_Hardware_Design 19 / 81
USIM2_DATA
86
DIO
(U)SIM2 card data
1.8 V (U)SIM
：
V
IL
max = 0.6 V
V
IH
min = 1.26 V
V
OL
max = 0.45 V
V
OH
min = 1.35 V
3.0 V (U)SIM
：
V
IL
max = 1.0 V
V
IH
min = 1.95 V
V
OL
max = 0.45 V
V
OH
min = 2.55 V
USIM2_CLK
84
DO
(U)SIM2 card clock
1.8 V (U)SIM
：
V
OL
max = 0.45 V
V
OH
min = 1.35 V
3.0 V (U)SIM
：
V
OL
max = 0.45 V
V
OH
min = 2.55 V
USIM2_RST
85
DO
(U)SIM2 card reset
1.8 V (U)SIM
：
V
OL
max = 0.45 V
V
OH
min = 1.35 V
3.0 V (U)SIM
：
V
OL
max = 0.45 V
V
OH
min = 2.55 V
USIM2_DET
83
DI
(U)SIM2 card hot-plug
detect
V
IL
min = -0.3 V
V
IL
max = 0.6 V
V
IH
min = 1.26 V
V
IH
max = 2.0 V
1.8 V power
domain. If
unused, keep it
open
Main UART Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics Comment
MAIN_CTS
36
DO
DTE clear to send signal
to DCE (connect to
DTE’s CTS)
V
OL
max = 0.45 V
V
OH
min = 1.35 V
1.8 V power
domain.
If unused, keep it
open.
MAIN_DTR&
MAIN_DCD&
MAIN_RI will
have a period of
time when the
module is
powered on.
MAIN_RTS
37
DI
DTE request to send
signal to DCE (connect
to DT
E’s RTS)
V
IL
min = -0.3 V
V
IL
max = 0.6 V
V
IH
min = 1.26 V
V
IH
max = 2.0 V
MAIN_RXD
34
DI
Main UART receive
V
IL
min = -0.3 V
V
IL
max = 0.6 V
V
IH
min = 1.26 V
V
IH
max = 2.0 V
