Wi-Fi&BT Module Series
FC21 Hardware Design
FC21_Hardware_Design 15 / 52
3.3. Pin Description
The following tables show the pin definition of FC21 module.
Table 3: I/O Parameters Definition
Table 4: Pin Description of FC21 Module
Type
Description
DI
Digital input
DO
Digital output
IO
Bidirectional
PI
Power input
Power Supply
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
VDD_3V3
21
PI
Main power supply
for module
Vmax=3.46V
Vmin=3.14V
Vnorm=3.3V
It must be provided
with sufficient current
up to 0.6A.
VIO
11
PI
Power supply for
module’s I/O pins
Vmax=3.46V
Vmin=1.71V
Vnorm=1.8V
It is suggested to be
powered by
EC2x&EG2x-G
module.
GND
1, 12, 20,
28, 29,
31, 36,
38~40,
43~45,
48~52
Ground
Wi-Fi Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
WAKE_ON_
WIRELESS
32
OD
Wi-Fi wake up the
host
V
OL
max=0.18V
V
OH
min=1.62V
1.8V power domain.
Active low.
Require external
pull-up to 1.8V.
If unused, keep this