Quectel UC20

UMTS/HSPA Module Series
UC20 Hardware Design
UC20_Hardware_Design Confidential / Released 22 / 84
USIM_RST
17
DO
Reset signal of
USIM card.
For 1.8V USIM:
V
OL
max = 0.22V
V
OH
min = 1.44V
For 3.0V USIM:
V
OL
max = 0.36V
V
OH
min = 2.4V
USIM_PRE
SENCE
13
DI
USIM card insertion
detection.
V
IL
min = -0.3V
V
IL
max = 0.6V
V
IH
min = 1.2V
V
IH
max = 2.0V
1.8V power domain.
ADC Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
ADC0
45
AI
General purpose
analog to digital
converter.
Voltage range:
0.2V to 2.1V
ADC1
44
AI
General purpose
analog to digital
converter.
Voltage range:
0.2V to 4.2V
Main UART Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
RI
62
DO
Ring indicator.
V
OL
max = 0.45V
V
OH
min = 1.35V
1.8V power domain.
DCD
63
DO
Data carrier
detection.
V
OL
max = 0.45V
V
OH
min = 1.35V
1.8V power domain.
CTS
64
DO
Clear to send.
V
OL
max = 0.45V
V
OH
min = 1.35V
1.8V power domain.
RTS
65
DI
Request to send.
V
IL
min = -0.3V
V
IL
max = 0.6V
V
IH
min = 1.2V
V
IH
max = 2.0V
1.8V power domain.
DTR
66
DI
Data terminal ready.
V
IL
min = -0.3V
V
IL
max = 0.6V
V
IH
min = 1.2V
V
IH
max = 2.0V
1.8V power domain.
Pull-up by default.
TXD
67
DO
Transmit data.
V
OL
max = 0.45V
V
OH
min = 1.35V
1.8V power domain.