Quectel UC20

UMTS/HSPA Module Series
UC20 Hardware Design
UC20_Hardware_Design Confidential / Released 18 / 82
3.3. Pin Description
The following tables show the UC20’s pin definition.
Table 3: IO Parameters Definition
Type
Description
IO
Bidirectional input/output
DI
Digital input
DO
Digital output
PI
Power input
PO
Power output
AI
Analog input
AO
Analog output
OD
Open drain
Table 4: Pin Description
Power Supply
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
VBAT_BB
59,60
PI
Power supply for
module baseband
part.
Vmax = 4.3V
Vmin = 3.3V
Vnorm = 3.8V
It must be able to
provide sufficient
current up to 0.8A.
VBAT_RF
57,58
PI
Power supply for
module RF part.
Vmax = 4.3V
Vmin = 3.3V
Vnorm = 3.8V
It must be able to
provide sufficient
current in a transmitting
burst which typically
rises to 2.0A.
VRTC
18
IO
Power supply for
internal RTC circuit.
V
O
max = 3.25V
when VBAT ≥ 3.3V.
V
I
= 1.5V~3.25V at
I
IN
= 3uA when
VBAT is not applied.
If unused, keep it open.
VDD_EXT
7
PO
Provide 1.8V for
Vnorm = 1.8V
Power supply for
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