UMTS/HSPA Module Series
UC20 Hardware Design
UC20_Hardware_Design Confidential / Released 21 / 84
USB_VBUS
71
PI
USB detection.
Vmax = 5.25V
Vmin = 3.0V
Vnorm = 5.0V
USB_DP
69
IO
USB differential data
bus.
Compliant with USB
2.0 standard
specification.
Require differential
impedance of 90Ω.
USB_DM
70
IO
USB differential data
bus.
Compliant with USB
2.0 standard
specification.
Require differential
impedance of 90Ω.
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 = 1.98V
Vmin = 1.62V
For 3.0V USIM:
Vmax = 3.3V
Vmin = 2.7V
I
O
max = 50mA
Either 1.8V or 3V is
supported by the
module automatically.
USIM_DATA 15
IO
Data signal of USIM
card.
For 1.8V USIM:
V
IL
max = 0.27V
V
IH
min = 1.26V
V
IH
max = 1.8V
V
OL
max = 0.27V
V
OH
min = 1.26V
For 3.0V USIM:
V
IL
max = 0.45V
V
IH
min = 2.1V
V
IH
max = 3.0V
V
OL
max = 0.45V
V
OH
min = 2.1V
Pull-up to USIM_VDD
with 15k resistor
internally.
USIM_CLK
16
DO
Clock signal of USIM
card.
For 1.8V USIM:
V
OL
max = 0.36V
V
OH
min = 1.26V
For 3.0V USIM:
V
OL
max = 0.5V
V
OH
min = 2.1V
