RAK3272-SiP Breakout Board Datasheet
Overview
Description
The RAK3272-SiP and RAK3272LP-SiP Breakout Boards were designed to allow easy access to theRAK3172-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's GPIO pins are accessible through 2.54 mm headers. The breakout board is powered by either the RAK3172-SiP or the RAK3172LP-SiP, both of which are based on the STM32WLE5JC. The STM32WLE5JC belongs to the STM32WLE5x family. It features an Arm® Cortex®-M4 core operating at 48 MHz and includes a sub-GHz radio based on the 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 TCXO 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.
The bottom view of the RAK3272-SiP Breakout Board is shown in Figure 2.
Hardware
The hardware specifications are divided into five sections, detailing interfacing, pinouts, and their corresponding functions with diagrams. They also include RF, electrical, and mechanical parameters, along with tabular data outlining 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.
Before powering the RAK3272-SiP Breakout Board, you should install the LoRa antenna first. Not doing so might damage the board.
Ensure that you use a LoRa antenna with an RP-SMA male connector that is compatible with the selected LoRa frequency.
Pin Definition
The Pin 1 of the header is highlighted in a blue rectangle.
Pin on RAK3272-SiP Connection on UART-USB Adapter
| Pin on RAK3272-SiP | Connection on UART-USB adapter |
|---|---|
| PA2 | RX |
| PA3 | TX |
| 3V3 | 3.3 V |
| GND | Ground |
The tables below show the header definitions of the RAK3272-SiP Breakout Board:
J3 Pin Definitions
| Pin | Name | Description | RAK3272-SiP Pin |
|---|---|---|---|
| 1 | I2C2_SDA | I2C2 interface | PA11 |
| 2 | I2C2_SCL | I2C2 interface | PA12 |
| 3 | RST | MCU Reset | RST |
| 4 | GND | Ground | - |
| 5 | SWDIO | PA13/SWD debug pin (SWDIO) | PA13 |
| 6 | SWCLK | PA14/SWD debug pin (SWCLK) | PA14 |
| 7 | UART2_TX | UART2/LPUART1 Interface (AT Commands and FW Update) | PA2 |
| 8 | UART2_RX | UART2/LPUART1 Interface (AT Commands and FW Update) | PA3 |
| 9 | 3V3 | Power Supply | - |
J4 Pin Definitions
| Pin | Name | Description | RAK3272-SiP Pin |
|---|---|---|---|
| 1 | SPI1_MOSI | GPIO or SPI1 (MOSI) | PA7 |
| 2 | SPI1_MISO | GPIO or SPI1 (MISO) | PA6 |
| 3 | SPI1_CLK | GPIO or SPI1 (CLK) | PA5 |
| 4 | SPI1_NSS | GPIO or SPI1 (NSS) | PA4 |
| 5 | UART1_RX | UART1 Interface | PB7 |
| 6 | UART1_TX | UART1 Interface | PB6 |
| 7 | GND | Ground | - |
| 8 | BOOT0 | BOOT0 mode enable pin - active high | - |
| 9 | 3V3 | Power Supply | - |
J5 Pin Definitions
| Pin | Name | Description | RAK3272-SiP Pin |
|---|---|---|---|
| 1 | PC6 | MCU pin PC6 | PC6 |
| 2 | PC5 | MCU pin PC5 | PC5 |
| 3 | PC4 | MCU pin PC4 | PC4 |
| 4 | PC3 | MCU pin PC3 | PC3 |
| 5 | PC2 | MCU pin PC2 | PC2 |
| 6 | PC1 | MCU pin PC1 | PC1 |
| 7 | PC0 | MCU pin PC0 | PC0 |
| 8 | PB9 | MCU pin PB9 | PB9 |
| 9 | PB8 | MCU pin PB8 | PB8 |
J6 Pin Definitions
| Pin | Name | Description | RAK3272-SiP Pin |
|---|---|---|---|
| 1 | PB11 | MCU pin PB11 | PB11 |
| 2 | PB10 | MCU pin PB10 | PB10 |
| 3 | PA9 | MCU pin PA9 | PA9 |
| 4 | PB1 | MCU pin PB1 | PB1 |
| 5 | PB2 | GPIO or PIN_A2 | PB2 |
| 6 | PB12 | MCU pin PB12 | PB12 |
| 7 | PB13 | MCU pin PB13 | PB13 |
| 8 | PB14 | MCU pin PB14 | PB14 |
| 9 | PA10 | GPIO or PIN_A3 | PA10 |
J7 Pin Definitions
| Pin | Name | Description | RAK3272-SiP Pin |
|---|---|---|---|
| 1 | 3V3 | Power Supply | - |
| 2 | PC13 | MCU pin PC13 | PC13 |
| 3 | PA15 | GPIO or PIN_A4 | PA15 |
| 4 | PB15 | MCU pin PB15 | PB15 |
| 5 | PA8 | MCU pin PA8 | PA8 |
J8 Pin Definitions
| Pin | Name | Description | RAK3272-SiP Pin |
|---|---|---|---|
| 1 | 3V3 | Power Supply | - |
| 2 | PB3 | GPIO or PIN_A0 | PB3 |
| 3 | PB4 | GPIO or PIN_A1 | PB4 |
| 4 | PB5 | MCU pin PB5 | PB5 |
| 5 | GND | Ground | - |
RF Characteristics
The RAK3272-SiP Breakout Board supports the LoRaWAN bands 863 MHz to 930 MHz
Operating Frequencies
| Module | Region | Frequency |
|---|---|---|
| RAK3272-SiP | Europe | EU868 |
| North America | US915 | |
| Australia | AU915 | |
| Korea | KR920 | |
| Asia | AS923-1/2/3/4 | |
| India | IN865 | |
| Russia | RU864 |
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.
Absolute Maximum Ratings
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| VDD and GPIO | -0.3 V | 3.9 | Volts (V) |
Operating Voltage
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| VCC | 1.8 | 3.6 | Volts (V) | |
| VDDA (ADC or COMP used) | 1.71 | 3.6 | Volts (V) | |
| VDDA (VREFBUF used) | 2.4 | 3.6 | Volts (V) | |
| VDDA (ADC, COMP or VREFBUF not used) | 0 | 3.6 | Volts (V) | |
| VBAT | 1.55 | 3.6 | Volts (V) | |
| VDDSMPS | 1.8 | 3.6 | Volts (V) | |
| VDDRF | 1.8 | 3.6 | Volts (V) | |
| VDDPA | 1.8 | 3.6 | Volts (V) | |
| VREF+ | 2.0 | VDDA | Volts (V) | |
| VREF+ (VDDA < 2V) | VDDA | VDDA | Volts (V) |
Operating Current
RAK3272-SiP (uses RFO_HP RF output)
| Parameter | Condition | Current Consumption (Typical) |
|---|---|---|
| TX mode | 20 dBm | 87 mA |
| RX mode | - | 6.14 mA |
| Sleep mode | - | 1.69 uA |
RAK3272LP-SiP (uses RFO_LP RF output)
| Parameter | Condition | Current Consumption (Typical) |
|---|---|---|
| TX mode | 14 dBm | 39.1 mA |
| 12 dBm | 33 mA | |
| 10 dBm | 28 mA | |
| 8 dBm | 25 mA | |
| RX mode | - | 9.69 mA |
| Sleep mode | - | 2.1 uA |
Schematic Diagram
Mechanical Characteristics
Figure 8 illustrates the dimensions of the RAK3272-SiP Breakout Board.
Software
Upload Firmware Using RAK DFU
The bin file contains only the application code and requires the RAK DFU Tool for uploading to the RAK3272-SiP Breakout Board through UART2.
The 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 the STM32CubeProgrammer and the ST-Link tool to upload the hex file. Use the diagram shown in Figure 9 to connect the ST-Link.
Firmware/OS
Download the latest RAK3272-SiP and RAK3272LP-SiP Breakout Board firmware provided below.
| Model | Version | Source |
|---|---|---|
| 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 |
