Quectel UC20 Manual page 22

USB_VBUS 71
USB_DP 69
USB_DM 70
USIM Interface
Pin Name Pin No.
USIM_GND 10
USIM_VDD 14
USIM_DATA 15
USIM_CLK 16
UC20_Hardware_Design
PI USB detection.
USB differential data
IO
bus.
USB differential data
IO
bus.
I/O Description
Specified ground for
USIM card.
Power supply for
PO
USIM card.
Data signal of USIM
IO
card.
Clock signal of USIM
DO
card.
Confidential / Released
UMTS/HSPA Module Series
UC20 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
For 1.8V USIM:
Vmax = 1.98V
Vmin = 1.62V
For 3.0V USIM:
Vmax = 3.3V
Vmin = 2.7V
I max = 50mA
O
For 1.8V USIM:
V max = 0.27V
IL
V min = 1.26V
IH
V max = 1.8V
IH
V max = 0.27V
OL
V min = 1.26V
OH
For 3.0V USIM:
V max = 0.45V
IL
V min = 2.1V
IH
V max = 3.0V
IH
V max = 0.45V
OL
V min = 2.1V
OH
For 1.8V USIM:
V max = 0.36V
OL
V min = 1.26V
OH
For 3.0V USIM:
V max = 0.5V
OL
V min = 2.1V
OH
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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