Product Info

LTE Standard Module Series
EC25 Series Hardware Design
EC25_Series_Hardware_Design 29 / 134
open.
USB_DM
70
IO
USB differential data
bus (-)
USB 2.0 Compliant.
Require differential
impedance of 90 Ω.
If unused, keep it
open.
(U)SIM Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
USIM_GND
10
Specified ground for
(U)SIM card
USIM_
PRESENCE
13
DI
(U)SIM card
insertion detection
V
IL
min = -0.3 V
V
IL
max = 0.6 V
V
IH
min = 1.2 V
V
IH
max = 2.0 V
1.8 V power domain.
If unused, keep it
open.
USIM_VDD
14
PO
Power supply for
(U)SIM card
I
O
max = 50 mA
For 1.8 V(U)SIM:
Vmax = 1.9 V
Vmin = 1.7 V
For 3.0 V(U)SIM:
Vmax = 3.05 V
Vmin = 2.7 V
Either 1.8 V or 3.0 V
is supported by the
module automatically.
USIM_DATA
15
IO
Data signal of
(U)SIM card
For 1.8 V (U)SIM:
V
IL
max = 0.6 V
V
IH
min = 1.2 V
V
OL
max = 0.45 V
V
OH
min = 1.35 V
For 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
USIM_CLK
16
DO
Clock signal of
(U)SIM card
For 1.8 V (U)SIM:
V
OL
max = 0.45 V
V
OH
min = 1.35 V
For 3.0 V (U)SIM:
V
OL
max = 0.45 V
V
OH
min = 2.55 V