User's Manual

UMTS/HSPA Module Series
UC20 Hardware Design
UC20_Hardware_Design Confidential / Released 20 / 84
VDD_EXT
7
PO
Provide 1.8V for
external circuit.
Vnorm = 1.8V
I
O
max = 20mA
Power supply for
external GPIO’s pull up
circuits.
VDD_2V85
34
PO
Provide 2.85V for
external circuit.
Vnorm = 2.85V
I
O
max = 100mA
Power supply for
external GNSS LNA,
active antenna and
other circuits.
GND
8,9,19,36,
46,48,50~
54,56,72,
85~112
Ground.
Turn On/Off
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
PWRKEY
21
DI
Turn on/off the
module.
R
PU
≈ 200kΩ
V
IH
max = 2.1V
V
IH
min = 1.3V
V
IL
max = 500mV
Pull-up to 1.8V
internally.
RESET_N
20
DI
Reset the module.
R
PU
≈ 200kΩ
V
IH
max = 2.1V
V
IH
min = 1.3V
V
IL
max = 500mV
Pull-up to 1.8V
internally.
Active low.
Status Indication
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
STATUS
61
OD
Indicate the module
operating status.
Require external
pull-up.
NET_MODE
5
DO
Indicate the module
network registration
mode.
V
OH
min = 1.35V
V
OL
max = 0.45V
1.8V power domain.
NET_
STATUS
6
DO
Indicate the module
network activity
status.
V
OH
min = 1.35V
V
OL
max = 0.45V
1.8V power domain.
SLEEP_IND
3
DO
Indicate the sleep
status.
V
OH
min = 1.35V
V
OL
max = 0.45V
1.8V power domain.
USB Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment