User's Manual

Wi-Fi&Bluetooth Module Series
FC41D_Hardware_Design
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transmit
MAIN_RXD
19
DI
Main UART
receive
DBG_TXD
26
DO
Debug UART
transmit
DBG_RXD
25
DI
Debug UART
receive
SPI Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
SPI_MISO
13
DIO
SPI master-in
salve-out
3.3 V power domain
SPI_MOSI
14
DIO
SPI master-out
slave-in
SPI_CLK
17
DIO
SPI clock
SPI_CS
18
DIO
SPI chip
selection
I2C Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
I2C_SCL
4
OD
I2C serial clock
3.3 V power domain
I2C_SDA
5
OD
I2C serial data
WAKEUP Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
WAKEUP_IN
7
DI
Wake up the
module from
deep sleep
3.3 V power domain
WAKEUP_
OUT*
8
DO
Wake up output
Indication Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
NET_STATUS
12
DO
Indicate the
module's network
activity status
3.3 V power domain
Output high level
when Wi-Fi is
connected in STA
mode;
Can be reused as