Product Info

Smart LTE Module Series
SC20 Hardware Design
SC20_Hardware_Design 25 / 130
3.3. Pin Description
The following tables show the SC20’s pin definition.
Table 7: I/O Parameters Definition
The following tables show the SC20’s pin definition and electrical characteristics.
Table 8: Pin Description
Type
Description
IO
Bidirectional
DI
Digital input
DO
Digital output
PI
Power input
PO
Power output
AI
Analog input
AO
Analog output
OD
Open drain
Power Supply
Pin Name
Pin No.
I/O
Description
DC
Characteristics
Comment
VBAT_BB
1, 2
PI
Power supply for
module’s
baseband part.
Vmax=4.2V
Vmin=3.5V
Vnorm=3.8V
It must be able to
provide sufficient
current up to 3.0A.
It is suggested to use
a zener diode for
voltage stabilization.
VBAT_RF
145, 146
PI
Power supply for
module’s RF part.
Vmax=4.2V
Vmin=3.5V
Vnorm=3.8V
VRTC
126
PI/PO
Power supply for
internal RTC
circuit.
V
O
max=3.2V
V
I
=2.0V~3.25V
If unused, keep this
pin open.
LDO5_1V8
111
PO
1.8V output power
supply
Vnorm=1.8V
I
O
max=20mA
Power supply for
external GPIO’s pull
up circuits and level