Product Info

- 11 -
5
GPIO04
Debug_UART_TX
PWM4
6
GPIO05
UART1_RTS
7
GPIO06
UART1_RXD
8
EN
Enable pin
9
GPIO08
SPI_M_CLK
10
GPIO09
UART1_CTS
11
GPIO10
SPI_M_MISO
12
GPIO12
SPI_M_MOSI
13
GPIO13
SPI_M_CS
14
GPIO07
UART1_TXD
15
GPIO00
PWM0
ADC
16
GPIO20
ADC
17
GPIO21
I2C_SCL
Debug_UART_RX
ADC
18
GPIO22
I2C_SDA
Debug_UART_TX
ADC
19
VDD33
Power
supply 3.3V
20
GND
Ground
Note：
1. By default, uart1 (pin7, PIN14) is used for general transparent transmission, UART0 (pin4, pin5)
is used for debug information output and firmware upgrade, and the serial port output level is
described by DC characteristics.
2. En is the module hardware reset, the low level is valid, and the module will be restarted after
reset to retain the original configuration information. The EN has been pulled up in the module
itself.
3. Reset button and LED indicator control pin need to be selected and designed according to the
actual firmware.
4. The ADC is a 10 bit ADC with an input voltage range of 0 ~ 1V.