Smart Wi-Fi Module Series
SC20-WL Hardware Design
SC20-WL_Hardware_Design
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3.3. Pin Description
The following tables show the SC20-WL
’s pin definition.
Table 3: I/O Parameters Definition
The following tables show the SC20-WL
’s pin definition and electrical characteristics.
Table 4: 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.
VRTC
126
PI/
PO
Power supply for
internal RTC circuit
V
O
max=3.2V
V
I
=2.0V~3.25V
I
IN
max=200uA
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
