Wi-Fi&Bluetooth Module Series
FCM561D-P_Hardware_Design
15 /
61
GND
1, 3, 5, 8, 17, 22, 36, 42
–48, 50, 51, 58, 74–85
Control Signal
Pin Name
Pin No.
I/O
Description
DC
Characteristics
Comment
CHIP_EN
4
DI
Enable the module VBAT
Hardware enable.
Internally pulled up to 3.3 V.
Active high.
UART1
Pin Name
Pin No.
I/O
Description
DC
Characteristics
Comment
UART1_TXD
38
DO
UART1 transmit
VBAT
UART1_RXD
37
DI
UART1 receive
USB Interface
Pin Name
Pin No.
I/O
Description
DC
Characteristics
Comment
USB_DP
6
AIO
USB 2.0
differential data (+)
USB 2.0 compliant.
Requires 85
–100 Ω
differential impedance;
recommended to be 90 Ω.
Test point must be
reserved.
USB_DM
7
AIO
USB 2.0
differential data (-)
RTC
Pin Name
Pin No.
I/O
Description
DC
Characteristics
Comment
XTAL32K
49
DI
32.768 kHz clock
input
RTC input.
If unused, keep it open.
GPIO Interfaces
Pin Name
Pin No.
I/O
Description
DC
Characteristics
Comment
GPIO0
40
DIO
General-purpose
input/output
VBAT
Interrupt wakeup.
GPIO1
39
DIO
General-purpose
input/output
GPIO2
21
DIO
General-purpose
input/output
GPIO3
20
DIO
General-purpose
input/output
