Quectel EG91 Series Hardware Design page 26

USB_DP 9
USB_DM 10
(U)SIM Interfaces
Pin Name Pin No.
USIM_GND 47
USIM1_VDD 43
USIM1_DATA 45
USIM1_CLK 46
EG91_Hardware_Design
USB differential
IO
data bus (+)
USB differential
IO
data bus (-)
I/O Description
Specified ground
for (U)SIM card
Power supply for
PO
(U)SIMcard
Data signal of
IO
(U)SIMcard
Clock signal of
DO
(U)SIMcard
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EG91 Hardware Design
Compliant with USB
2.0 standard
specification.
Compliant with USB
2.0 standard
specification.
DC Characteristics
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
For 3.0V (U)SIM:
V max=0.45V
OL
V min=2.55V
OH
LTE Module Series
Require differential
impedance of 90Ω.
Require differential
impedance of 90Ω.
Comment
Connect to ground of
(U)SIM card
connector.
Either 1.8V or 3.0V is
supported by the
module automatically.