Specifications

6
The table below shows the pin definition of the RAK4270 LoRa Module.
Pin Name I/O Description Alternate functions
1
UART2_RX I
This UART port is used
as an AT command port
(STM32L071KBU6 PA3)
USART1_RX,
I2C1_SDA
2
UART2_TX O
This UART port is used
as an AT command port
(STM32L071KBU6 PA2)
MCO, USART1_TX,
I2C1_SCL, I2C3_SMBA
3
UART2_DE I/O
GPIO (STM32L071KBU6
PA1)
SPI1_MOSI,EVENTOUT,
USART1_RTS_DE,
COMP2_OUT
4
UART1_TX I/O
This UART port can be
used as an AT
command port and an
upgrade port
(STM32L071KBU6 PA9)
TIM21_CH1,TIM2_CH3,
USART2_TX,LPUART1_TX,
COMP2_OUT,COMP2_INM,
ADC_IN2
5
UART1_RX I/O
This UART port can be
used as an AT command
port and an upgrade port
(STM32L071KBU6 PA10)
TIM21_CH2,TIM2_CH4,
USART2_RX,LPUART1_RX,
COMP2_INP,ADC_IN3
6
UART1_DE I/O
General GPIO or
UART(Reserved)
(STM32L071KBU6 PA12)
EVENTOUT,TIM2_CH2,USART2_RT
S_DE,
TIM21_ETR,
USART4_RX,COMP1_INP,
ADC_IN1
7
SWDIO I/O
Programming
(STM32L071KBU6 PA13)
SWDIO, LPUART1_RX
8
SWCLK I/O
Programming
(STM32L071KBU6 PA14)
SWCLK, USART2_TX,
LPUART1_TX
9
I2C_SCL I/O
I2C interface
(STM32L071KBU6 PB6)
USART1_TX,I2C1_SCL,
LPTIM1_ETR,COMP2_INP
10
I2C_SDA I/O
I2C interface
(STM32L071KBU6 PB7)
USART1_RX,I2C1_SDA,
LPTIM1_IN2,USART4_CTS,
COMP2_INP,VREF_PVD_IN
11
GND - Ground -
12
RF I/O
RF port (reserved), default RF
out by IPEX
-
13
GND - Ground -
14
GND - Ground
-
15
ANT_SW I/O PA11 leave it un-connect on mainboard
16
PB4 I/O STM32L071KBU6 PB4
USART1_CTS,SPI1_MISO,
TIM3_CH1,I2C3_SDA