Quectel UC20

UMTS/HSPA Module Series
UC20 Hardware Design
UC20_Hardware_Design Confidential / Released 21 / 82
V
OH
min = 2.55V
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.
If unused, keep it
open.
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
If unused, keep it
open.
ADC1
44
AI
General purpose
analog to digital
converter.
Voltage range:
0.2V to 4.2V
If unused, keep it
open.
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.
If unused, keep it
open.
DCD
63
DO
Data carrier
detection.
V
OL
max = 0.45V
V
OH
min = 1.35V
1.8V power domain.
If unused, keep it
open.
CTS
64
DO
Clear to send.
V
OL
max = 0.45V
V
OH
min = 1.35V
1.8V power domain.
If unused, keep it
open.
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.
If unused, keep it
open.
DTR
66
DI
Data terminal ready,
sleep mode control.
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.
Low level wakes up
the module. If
unused, keep it open.
TXD
67
DO
Transmit data.
V
OL
max = 0.45V
V
OH
min = 1.35V
1.8V power domain.
If unused, keep it
open.
RXD
68
DI
Receive data.
V
IL
min = -0.3V
V
IL
max = 0.6V
V
IH
min = 1.2V
1.8V power domain.
If unused, keep it
open.
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