User Manual

3.2 The definition of pin
Pin
number
Name
Type
Description
1
GND
Power
System GND
2
GPIO33
O
This IO function is high output at module
wake up and IO low during hibernation.
For 9V battery power supply cases,
for low power consumption. Power is
supplied by LDO when the module is
dormant and by DCDC when the
module wakes up.
External LED, usually high, put low when
lighting.
3
GPIO37
I
1. For the external MCU to wake up
LoRa module. (Usually high level,
when the module needs to wake up,
the MCU output 1ms pulse (low level
effective) to the module. All mode
pull down low levels above 2S
recovery port rate default);
2. For the external MCU tells Lora is
ready to receive AT instructions;
4
GPIO32
O
1. To wake up external MCU.
2. Use to tell the Mcu,Lora module
has been awakened to accept AT
instructions; Lower wireless data,
finish sending, and hibernation
5
GPTIM0_CH1
SPI0_CS
GPIO01
IO
PWM output
SPI chip selection
IO
6
GPTIM0_CH0
SPI0_CLK
GPIO00
IO
PWM output
SPI clock
IO
7
GPTIM0_CH3
SPI0_RX
GPIO03
IO
PWM output
SPI input
IO
8
BOOT
GPTIM0_CH2
SPI0_TX
GPIO02
IO
Choose BOOT（internal pull-down）。
PWM output
SPI output
IO
9
SWD
GPIO06
IO
Simulator debugging SWD（pull-up）
IO