Chengdu Ebyte Electronic Technology Co.,Ltd.
Copyright ©2012–2021
,
Chengdu Ebyte Electronic Technology Co.,Ltd.
4
3.2 Pin definition
Pin number
Pin name
Pin direction
Pin usage
1
GND
-
Ground wire, connected to the power reference
ground
2
VCC
-
Power supply, range 2.5V~3.7V (recommend to add
ceramic filter capacitor)
3
SETB
-
Low-power wake-up pin
4
DIO1
Input/output
NC
(
reserved pin
)
5
BUSY
Input/output
NC
(
reserved pin
)
6
I2C_SDA
Input/output
NC
(
reserved pin
)
7
I2C_SCL
Input/output
NC
(
reserved pin
)
8
UART_CTS
Input/output
NC
(
reserved pin
)
9
UART_RTS
Input/output
NC
(
reserved pin
)
10
GND
-
Ground wire, connected to the power reference
ground
11
ON
-
Antenna interface, stamp hole (50 ohm characteristic
impedance)
12
GND
-
Ground wire, connected to the power reference
ground
13
GND
-
Ground wire, connected to the power reference
ground
14
GND
-
Ground wire, connected to the power reference
ground
15
GND
-
Ground wire, connected to the power reference
ground
16
XRES
Input
External reset pin
17
ADC_IN
Input
NC
(
reserved pin
)
18
THE
Input/output
NC
(
reserved pin
)
19
SILK
Input/output
NC
(
reserved pin
)
20
UART_RX
Input/output
UART RX pin
21
UART_TX
Input/output
UART TX pin
22
SWD_DATA
Input/output
SWD Data pin
23
SWD_CLK
Input/output
SWD Clock pin
24
GND
-
Ground wire, connected to the power reference
ground
25
SPI_MISO
Input/output
SPI MISO test point is internally connected and
cannot be used as an external SPI
26
SPI_NSS
Input/output
SPI NSS test point is internally connected and cannot
be used as an external SPI
27
SPI_MOSI
Input/output
SPI MOSI test point is internally connected and
cannot be used as an external SPI