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Chengdu Ebyte Electronic Technology Co.,Ltd.
3.2 Pin definition
Pin number
1
2
3
4
5
6
7
8
UART_CTS
9
UART_RTS
10
11
12
13
14
15
16
17
18
19
20
UART_RX
21
22
SWD_DATA
23
SWD_CLK
24
25
SPI_MISO
26
27
SPI_MOSI
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Pin name
Pin direction
-
GND
VCC
-
SETB
-
DIO1
Input/output
BUSY
Input/output
I2C_SDA
Input/output
Input/output
I2C_SCL
Input/output
Input/output
GND
-
ON
-
GND
-
GND
-
GND
-
GND
-
XRES
Input
ADC_IN
Input
THE
Input/output
SILK
Input/output
Input/output
UART_TX
Input/output
Input/output
Input/output
GND
-
Input/output
SPI_NSS
Input/output
Input/output
Pin usage
Ground wire, connected to the power reference
ground
Power supply, range 2.5V~3.7V (recommend to add
ceramic filter capacitor)
Low-power wake-up pin
NC（reserved pin）
NC（reserved pin）
NC（reserved pin）
NC（reserved pin）
NC（reserved pin）
NC（reserved pin）
Ground wire, connected to the power reference
ground
Antenna interface, stamp hole (50 ohm characteristic
impedance)
Ground wire, connected to the power reference
ground
Ground wire, connected to the power reference
ground
Ground wire, connected to the power reference
ground
Ground wire, connected to the power reference
ground
External reset pin
NC（reserved pin）
NC（reserved pin）
NC（reserved pin）
UART RX pin
UART TX pin
SWD Data pin
SWD Clock pin
Ground wire, connected to the power reference
ground
SPI MISO test point is internally connected and
cannot be used as an external SPI
SPI NSS test point is internally connected and cannot
be used as an external SPI
SPI MOSI test point is internally connected and
cannot be used as an external SPI
E78-868LN22S(6601)User manual
4
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