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RAK11721 Breakout Board Datasheet

Overview​

Description​

RAK11721 Breakout Board is specifically designed to allow easy access to the pins on the board to simplify development and testing. The breakout board footprint allows the RAK11720 stamp module pins to be accessible via 2.54 mm headers.

The board itself has the RAK11720 at its core, integrating an Ambiq Apollo3 Blue AMA3B1KK-KBR-B0 SoC MCU chip and a Semtech SX1262 LoRa transceiver. It has an ultra-low power consumption of 2.37 µA in sleep mode.

This module complies with Class A, B, and C of LoRaWAN 1.0.3 specifications. It also supports LoRa Point-to-Point (P2P) communication mode, which helps you implement your own customized LoRa network quickly.

Features​

  • Based on RAK11720
  • Custom firmware using Arduino via RUI3 API
  • I/O ports: UART/I2C/GPIO/SPI
  • Serial Wire Debug (SWD) interface
  • Module size: 25.4 mm x 32.3 mm
  • Supply Voltage: 1.8 V ~ 3.6 V
  • Temperature Range: -40° C ~ 85° C

Specifications​

Overview​

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 electrical and mechanical parameters of the board, including the tabular data of the functionalities and standard values.

Interface​

SWD Programming Interface​

When programming via a RAKDAP1 or other ARM debugging tool, it is required to have the following four pins connected.

  • 3V3
  • SWDIO
  • SWCLK
  • GND
UART Interface​

This board has two UART interfaces:

  • UART0 (allows AT Commands and FW Update)
  • UART1 (can allow AT commands if configured via RUI3 Serial Port Mode)
I2C and SPI Interface​

Only one I2C and SPI interface of RAK11721:

  • I2C
  • SPI

Pin Definition​

The tables below show the pin definition of the RAK11721 Breakout Board:

J5 Pin Definitions​
Pin No.NameDescriptionAPOLLO3_BLUE Pin
1SPI_MOSIGPIO and SPI (MOSI) GPGP7
2SPI_MISOGPIO and SPI (MISO)GP6
3SPI_CLKGPIO and SPI (CLK)GP5
4SPI_CSGPIO and SPI (NSS)GP1
5UART0_RXUART0 Interface (AT Commands and FW Update)GP40
6UART0_TXUART0 Interface (AT Commands and FW Update)GP39
7GNDGround-
8BOOT0Boot0 mode enable pin - high activeGP41
93V3Power Supply-
J4 Pin Definitions​
Pin No.NameDescriptionAPOLLO3_BLUE Pin
1I2C_SDAI2C interfaceGP25
2I2C_SCLI2C interfaceGP27
3RSTMCU Reset-
4GNDGround-
5SWDIOSWD debug pin (SWDIO)GP21
6SWCLKSWD debug pin (SWCLK)GP20
7UART1_TXUART1 InterfaceGP42
8UART1_RXUART1 InterfaceGP43
93V3Power Supply-

RF Characteristics​

The RAK11721 breakout board supports the LoRaWAN bands shown in the table below. When buying a RAK11721 board, pay attention to the correct module, RAK11721 (L) or RAK11721 (H) for your region, where L is for low-frequency regions. Take note that no suffix means high-frequency.

ModuleRegionFrequency
RAK11721 (L)EuropeEU433
ChinaCN470
RAK11721 (H)EuropeEU868
North AmericaUS915
AustraliaAU915
KoreaKR920
AsiaAS923-1/2/3/4
IndiaIN865
RussiaRU864

Electrical Characteristics​

Power Consumption​
FeatureConditionTypicalUnit
Operating CurrentLoRa TX Mode87 @ 20 dBm, 868 MHzmA
BLE TX Mode12.7 @ 4.0 dBmmA
Sleep CurrentWith Ch34020uA
Operating Voltage​
FeatureMinimumTypicalMaximumUnit
VCC1.83.33.6V
Schematic Diagram​
Figure 6041: RAK11721 Schematic Diagram

Mechanical Characteristics​

Figure 6042: RAK11721 Mechanical Dimensions

Firmware​

Download the latest firmware of the RAK11721 Breakout Board provided below. RAK11721 (L) and RAK11721 (H) use the same firmware, and it will automatically detect the variant of the module being used.

ModelNoteSource
RAK11721 (.bin via UART)(default baudrate = 115200)Download
RAK11721 (.bin via BLE)Download
RAK11721 (.hex)Download