Quectel EC25-AUX Hardware Design page 27

USB_VBUS 71
USB_DP 69
USB_DM 70
(U)SIM Interface
Pin Name Pin No.
USIM_GND 10
USIM_
13
PRESENCE
USIM_VDD 14
USIM_DATA 15
USIM_CLK 16
EC25_Hardware_Design
USB power supply,
PI used for USB
detection
USB differential data
IO
bus (+)
USB differential data
IO
bus (-)
I/O Description
Specified ground for
(U)SIM card
(U)SIM card
DI
insertion detection
Power supply for
PO
(U)SIM card
Data signal of
IO
(U)SIM card
Clock signal of
DO
(U)SIM card
LTE Standard Module Series
EC25 Hardware Design
Vmax=5.25V
Vmin=3.0V
Vnorm=5.0V
Compliant with USB
2.0 standard
specification.
Compliant with USB
2.0 standard
specification.
DC Characteristics
V min=-0.3V
IL
V max=0.6V
IL
V min=1.2V
IH
V max=2.0V
IH
For 1.8V(U)SIM:
Vmax=1.9V
Vmin=1.7V
For 3.0V(U)SIM:
Vmax=3.05V
Vmin=2.7V
I max=50mA
O
For 1.8V (U)SIM:
V max=0.6V
IL
V min=1.2V
IH
V max=0.45V
OL
V min=1.35V
OH
For 3.0V (U)SIM:
V max=1.0V
IL
V min=1.95V
IH
V max=0.45V
OL
V min=2.55V
OH
For 1.8V (U)SIM:
V max=0.45V
OL
V min=1.35V
OH
Typical: 5.0V
If unused, keep it
open.
Require differential
impedance of 90Ω.
If unused, keep it
open.
Require differential
impedance of 90Ω.
If unused, keep it
open.
Comment
1.8V power domain.
If unused, keep it
open.
Either 1.8V or 3.0V is
supported by the
module automatically.
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