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RAK3272-SiP Breakout Board Datasheet

Overview​

Description​

The RAK3272-SiP and RAK3272LP-SiP Breakout Boards were designed to allow easy access to the RAK3172-SiP/RAK3172LP-SiP module pins to simplify development and testing. The two SiP module variants use different RF output paths to optimize current consumption depending on the application. RAK3172-SiP uses RFO_HP while RAK3172LP-SiP uses the RFO_LP on the STM32WL SoC transceiver.

The microcontroller GPIO pins are accessible via 2.54 mm headers. The breakout board itself has a RAK3172-SiP or RAK3172LP-SiP (based on STM32WLE5JC) as its core. The STM32WLE5JC is part of the STM32WLE5x family. This core is based on an Arm® Cortex®‐M4 core running at 48 MHz, and a sub-GHz radio based on Semtech SX126x.

The board complies with Class A, B, & C of LoRaWAN 1.0.3 specifications and also features LoRa Point-to-Point (P2P) communication mode, which helps you in implementing your own customized long-range LoRa network quickly. It is also RUI3 compatible which allows you to create custom firmware using RUI3 APIs.

Features​

  • 32-bit Arm® Cortex®‐M4 48 MHz MCU and sub-GHz Semtech SX126x radio
  • Chipset STM32WLE5JC (single-core)
  • Two variants available
    • RAK3272-SiP (uses RFO_HP)
    • RAK3272LP-SiP (uses RFO_LP)
  • I/O ports: UART/I2C/GPIO/SPI
  • 32 MHz TXCO and 32 kHz xtal
  • RUI3 API compatible
  • Custom firmware using Arduino via RUI3 API
  • Easy to use AT Command set via UART interface
  • Serial Wire Debug (SWD) interface
  • LoRaWAN 1.0.3 specification compliant
  • Supported bands: IN865, EU868, AU915, US915, KR920, RU864, and AS923
  • Supply voltage: 1.8 V ~ 3.6 V
  • Temperature range: -40° C ~ 85° C
  • Size: 25.4 mm x 41.8 mm

Specifications​

Overview​

The top view of the RAK3272-SiP and RAK3272LP-SiP Breakout Board are shown in Figure 1.

Figure 6818: RAK3272-SiP and RAK3272LP-SiP Breakout Board top view

The bottom view of the RAK3272-SiP Breakout Board is shown in Figure 2.

Figure 6819: RAK3272-SiP Breakout Board bottom view

Hardware​

The hardware specification is categorized into five (5) parts. It discusses the interfacing, pinouts, and their corresponding functions and diagrams. It also covers the RF, electrical and mechanical parameters, including the tabular data of the functionalities and standard values of the RAK3272-SiP Breakout Board.

Interface​

SWD Programming Interface​

When programming via an ST-Link tool, it is required to have all of the following four pins connected to your ST-Link tool:

  • 3V3
  • SWDIO
  • SWCLK
  • GND

For more information refer to the Upload firmware using ST-Link section.

UART Interface​

This board has two UART interfaces:

  • UART2 (default interface for firmware uploading and AT Commands)
  • UART1
RF Interface​

J2 is the RP-SMA antenna connector.

warning

Before powering the RAK3272-SiP Breakout Board, you should install the LoRa antenna first. Not doing so might damage the board.

Make sure to use a LoRa antenna with RP-SMA male connector that is compatible with the chosen LoRa frequency.

Figure 6820: LoRa antenna with RP-SMA male connector

Pin Definition​

Figure 6821: RAK3272-SiP Breakout Board J3 and J4 header

The Pin 1 of the header is highlighted in a blue rectangle.

Figure 6822: RAK3272-SiP Breakout Board J5 to J8 header
Pin on RAK3272-SiP Connection on UART-USB Adapter​
Pin on RAK3272-SiPConnection on UART-USB adapter
PA2RX
PA3TX
3V33.3 V
GNDGround

The tables below show the header definitions of the RAK3272-SiP Breakout Board:

J3 Pin Definitions​
PinNameDescriptionRAK3272-SiP Pin
1I2C2_SDAI2C2 interfacePA11
2I2C2_SCLI2C2 interfacePA12
3RSTMCU ResetRST
4GNDGround-
5SWDIOPA13/SWD debug pin (SWDIO)PA13
6SWCLKPA14/SWD debug pin (SWCLK)PA14
7UART2_TXUART2/LPUART1 Interface (AT Commands and FW Update)PA2
8UART2_RXUART2/LPUART1 Interface (AT Commands and FW Update)PA3
93V3Power Supply-
J4 Pin Definitions​
PinNameDescriptionRAK3272-SiP Pin
1SPI1_MOSIGPIO or SPI1 (MOSI)PA7
2SPI1_MISOGPIO or SPI1 (MISO)PA6
3SPI1_CLKGPIO or SPI1 (CLK)PA5
4SPI1_NSSGPIO or SPI1 (NSS)PA4
5UART1_RXUART1 InterfacePB7
6UART1_TXUART1 InterfacePB6
7GNDGround-
8BOOT0BOOT0 mode enable pin - active high-
93V3Power Supply-
J5 Pin Definitions​
PinNameDescriptionRAK3272-SiP Pin
1PC6MCU pin PC6PC6
2PC5MCU pin PC5PC5
3PC4MCU pin PC4PC4
4PC3MCU pin PC3PC3
5PC2MCU pin PC2PC2
6PC1MCU pin PC1PC1
7PC0MCU pin PC0PC0
8PB9MCU pin PB9PB9
9PB8MCU pin PB8PB8
J6 Pin Definitions​
PinNameDescriptionRAK3272-SiP Pin
1PB11MCU pin PB11PB11
2PB10MCU pin PB10PB10
3PA9MCU pin PA9PA9
4PB1MCU pin PB1PB1
5PB2GPIO or PIN_A2PB2
6PB12MCU pin PB12PB12
7PB13MCU pin PB13PB13
8PB14MCU pin PB14PB14
9PA10GPIO or PIN_A3PA10
J7 Pin Definitions​
PinNameDescriptionRAK3272-SiP Pin
13V3Power Supply-
2PC13MCU pin PC13PC13
3PA15GPIO or PIN_A4PA15
4PB15MCU pin PB15PB15
5PA8MCU pin PA8PA8
J8 Pin Definitions​
PinNameDescriptionRAK3272-SiP Pin
13V3Power Supply-
2PB3GPIO or PIN_A0PB3
3PB4GPIO or PIN_A1PB4
4PB5MCU pin PB5PB5
5GNDGround-

RF Characteristics​

The RAK3272-SiP Breakout Board supports the LoRaWAN bands 863 MHz to 930 MHz

Operating Frequencies​
ModuleRegionFrequency
RAK3272-SiPEuropeEU868
North AmericaUS915
AustraliaAU915
KoreaKR920
AsiaAS923-1/2/3/4
IndiaIN865
RussiaRU864

Electrical Characteristics​

RAK3272-SiP Power Supply Scheme​

The RAK3272-SiP Breakout Board can use two different power supply regulators: LDO or DCDC (SMPS) - Switch Mode Power Supply.

The use of DCDC is optional but improves the power efficiency. If you want to disable the DCDC mode, then you need to remove the L1 inductor, as shown in Figure 6.

Figure 6823: RAK3272-SiP Breakout Board DCDC inductor
Absolute Maximum Ratings​
ParameterMinimumTypicalMaximumUnit
VDD and GPIO-0.3 V3.9Volts (V)
Operating Voltage​
ParameterMinimumTypicalMaximumUnit
VCC1.83.6Volts (V)
VDDA (ADC or COMP used)1.713.6Volts (V)
VDDA (VREFBUF used)2.43.6Volts (V)
VDDA (ADC, COMP or VREFBUF not used)03.6Volts (V)
VBAT1.553.6Volts (V)
VDDSMPS1.83.6Volts (V)
VDDRF1.83.6Volts (V)
VDDPA1.83.6Volts (V)
VREF+2.0VDDAVolts (V)
VREF+ (VDDA < 2V)VDDAVDDAVolts (V)
Operating Current​
RAK3272-SiP (uses RFO_HP RF output)​
ParameterConditionCurrent Consumption (Typical)
TX mode20 dBm87 mA
RX mode-6.14 mA
Sleep mode-1.69 uA
RAK3272LP-SiP (uses RFO_LP RF output)​
ParameterConditionCurrent Consumption (Typical)
TX mode14 dBm39.1 mA
12 dBm33 mA
10 dBm28 mA
8 dBm25 mA
RX mode-9.69 mA
Sleep mode-2.1 uA
Schematic Diagram​
Figure 6824: RAK3272-SiP schematic diagram

Mechanical Characteristics​

Figure 8 shows RAK3272-SiP Breakout Board dimensions.

Figure 6825: RAK3272-SiP Breakout Board mechanical dimensions

Software​

Upload Firmware Using RAK DFU​

The bin file contains the application code only, and you need the RAK DFU Tool to upload this file to the RAK3272-SiP Breakout Board via UART2.

RAK3272-SiP Breakout Board uses UART2 serial pins to upload the latest firmware. Refer to the Connect to the RAK3272-SiP Breakout Board section.

Upload Firmware Using ST-Link​

The hex file contains both the bootloader and the application code.

You need to use STM32CubeProgrammer and ST-Link tool to upload the hex file. Use the diagram shown in Figure 9 to connect the ST-Link.

Figure 6826: RAK3272-SiP Breakout Board ST-Link connection

Firmware/OS​

Download the latest RAK3272-SiP and RAK3272LP-SiP Breakout Board firmware provided below.

ModelVersionSource
RAK3272-SiP (.bin)RUI3 (App only)Download
RAK3272-SiP (.hex)RUI3 (Bootloader and App)Download
RAK3272LP-SiP (.bin)RUI3 (App only)Download
RAK3272LP-SiP (.hex)RUI3 (Bootloader and App)Download