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3.3. Pin Description
The following tables show the SC20-WL's pin definition.
Table 3: I/O Parameters Definition
Type
IO
DI
DO
PI
PO
AI
AO
OD
The following tables show the SC20-WL's pin definition and electrical characteristics.
Table 4: Pin Description
Power Supply
Pin Name
Pin No.
VBAT_BB
1, 2
VRTC
126
LDO5_1V8
111
SC20-WL_Hardware_Design
Description
Bidirectional
Digital input
Digital output
Power input
Power output
Analog input
Analog output
Open drain
I/O
Description
Power supply for
PI
module's baseband
part
PI/
Power supply for
PO
internal RTC circuit
1.8V output power
PO
supply
Smart Wi-Fi Module Series
SC20-WL Hardware Design
DC
Comment
Characteristics
It must be able to
provide sufficient
Vmax=4.2V
current up to 3.0A.
Vmin=3.5V
It is suggested to
Vnorm=3.8V
use a zener diode
for voltage
stabilization.
V
max=3.2V
O
If unused, keep this
V
=2.0V~3.25V
I
pin open.
I
max=200uA
IN
Vnorm=1.8V
Power supply for
external GPIO's
I
max=20mA
O
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