Quectel UC20 Hardware Design page 21

USB_DP
USB_DM
USIM Interface
Pin Name
USIM_GND
USIM_VDD
USIM_DATA
USIM_CLK
USIM_RST
UC20_Hardware_Design
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USB differential data
69 IO
bus.
USB differential data
70 IO
bus.
Pin No. I/O Description
Specified ground for
10
USIM card.
Power supply for
14 PO
USIM card.
Data signal of USIM
15 IO
card.
Clock signal of USIM
16 DO
card.
Reset signal of
17 DO
USIM card.
Compliant with USB
2.0 standard
specification.
Compliant with USB
2.0 standard
specification.
DC Characteristics
For 1.8V USIM:
Vmax = 1.9V
Vmin = 1.7V
For 3.0V USIM:
Vmax = 3.05V
Vmin = 2.7V
I max = 50mA
O
For 1.8V USIM:
V max = 0.6V
IL
V min = 1.2V
IH
V max = 0.45V
OL
V min = 1.35V
OH
For 3.0V USIM:
V max = 1.0V
IL
V min = 1.95V
IH
V max = 0.45V
OL
V min = 2.55V
OH
For 1.8V USIM:
V max = 0.45V
OL
V min = 1.35V
OH
For 3.0V USIM:
V max = 0.45V
OL
V min = 2.55V
OH
For 1.8V USIM:
V max = 0.45V
OL
V min = 1.35V
OH
For 3.0V USIM:
V max = 0.45V
OL
Confidential / Released
UMTS/HSPA Module Series
UC20 Hardware Design
Require differential
impedance of 90Ω.
Require differential
impedance of 90Ω.
Comment
Either 1.8V or 3V is
supported by the
module automatically.
Pull-up to USIM_VDD
with 15k resistor
internally.
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