User's Manual

LTE Module Series
EC25Hardware Design
EC25_Hardware_DesignConfidential / Released 21 / 90
USB_DM 70 IO
USB differential data
bus
Compliant with USB
2.0 standard
specification.
Require differential
impedance of 90ohm.
USIM Interface
Pin Name Pin No. I/O Description DC Characteristics Comment
USIM_GND 10
Specified ground for
USIM card
USIM_VDD 14 PO
Power supply for
USIM card
For 1.8V USIM:
Vmax=1.9V
Vmin=1.7V
For 3.0V USIM:
Vmax=3.05V
Vmin=2.7V
I
O
max=50mA
Either 1.8V or 3.0V is
supported by the
module automatically.
USIM_DATA 15 IO
Data signal of USIM
card
For 1.8V USIM:
V
IL
max=0.6V
V
IH
min=1.2V
V
OL
max=0.45V
V
OH
min=1.35V
For 3.0V USIM:
V
IL
max=1.0V
V
IH
min=1.95V
V
OL
max=0.45V
V
OH
min=2.55V
USIM_CLK 16 DO
Clock signal of USIM
card
For 1.8V USIM:
V
OL
max=0.45V
V
OH
min=1.35V
For 3.0V USIM:
V
OL
max=0.45V
V
OH
min=2.55V
USIM_RST 17 DO
Reset signal of
USIM card
For 1.8V USIM:
V
OL
max=0.45V
V
OH
min=1.35V
For 3.0V USIM:
V
OL
max=0.45V
V
OH
min=2.55V
USIM_
PRESENCE
13 DI
USIM card insertion
detection
V
IL
min=-0.3V
V
IL
max=0.6V
1.8V power domain.
If unused, keep it