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RAK811 WisDuo LPWAN Module Datasheet

Overview​

Description​

The RAK811 is a Low-Power Long-Range LoRa Technology Transceiver module that provides an easy-to-use, small size, and low-power solution for long-range wireless data applications.

This module complies with Class A & C of LoRaWAN 1.0.2 specifications that can easily connect to different LoRaWAN server platforms like TheThingsNetwork (TTN), Chirpstack, Actility, etc. It also supports LoRa Point-to-Point (P2P) communication mode, which helps you in implementing your own customized long-range LoRa network quickly.

The RAK811 module is integrated with Semtech’s SX1276 and STM32. You can configure the mode and operation of the module using AT commands via a UART interface. Also, it offers low-power features, which are very suitable for battery-powered applications.

Features​

  • Based on Semtech SX1276
  • LoRaWAN 1.0.2 specification compliant
  • Supported bands: EU433, CN470, IN865, EU868, AU915, US915, KR920, and AS923
  • LoRaWAN Activation by OTAA/ABP
  • LoRa Point-to-Point (P2P) communication
  • Easy to use AT Command Set via UART interface with configurable baud rate
  • Maximum output power 100 mW (20 dBm), adjustable from 5~20 dBm
  • High sensitivity at -148 dBm, enabling extremely long-range connectivity
  • Long-range - greater than 15 km with optimized antenna
  • Low power consumption: 11 μA on standby
  • Ultra-Low Power Consumption of 11.9 μA (down to 1.11 μA @ 2.1 V) in sleep mode
  • Multi-channel, dual data buffer (256 bytes each)
  • LoRa/FSK/GFSK/OOK modulation, bidirectional two-way communication
  • Long battery life for battery-powered applications
  • LoRa technology is capable of demodulating 20 dB below noise level which significantly improves immunity to interference when combined with integrated forward error
  • Operating temperature: -30° C ~ 85° C (industrial grade)
  • Storage temperature: -40° C ~ 85° C (non-condensing)

Specifications​

This section covers the hardware and software specifications of RAK811. All discussion presents both versions: RAK811(L) and RAK811(H). Also, it includes the block diagram and the updated firmware link of the RAK811 WisDuo module.

Overview​

Block Diagram​

Figure 8360: RAK811 System Block Diagram

Hardware​

The hardware specification is categorized into six parts. It discusses the pinouts of the module and its corresponding functions and diagrams. It also covers the RF, electrical, environmental, and mechanical parameters that include the tabular data of the functionalities and standard values of the RAK811 Module.

Interfaces​

ModuleInterfaces
RAK811UART1, UART3, GPIOs, ADC

Pin Definition​

The RAK811 supports two different frequency variations: Low Radio Frequency and High Radio Frequency.

warning

When using RF_OUT pin for antenna and not the IPEX connector variant, there are design considerations to make sure optimum RF performance.

  • RF trace must be away from interference (switching node of DC-DC supply, high current/voltage pulses from controllers of inductive load like motor, signal generators, etc.)
  • RF trace must have 50 Ohms impedance. It is advisable to use an impedance simulation software tool to achieve this requirement.
  • If using an external antenna connector, make it close to the RF_OUT pin.
  • Ground plane optimization is critical on certain antenna types like monopole.
  • GND trace used for RF path return must be directly connected to the GND plane and not be treated as thermal relief.
  • It is recommended for the RF trace to be routed in a curve and not in a sharp 90 degrees.

In addition, with a commitment to making IoT easy, RAK offers a dedicated service for Antenna RF Design which includes PCB design, tuning, matching, and RF testing.

1. Low Radio Frequency Version (RAK811(L))​

Low radio frequency hardware supports bandwidth in the regions of EU433 and CN470. For more information, refer to the RF Characteristics.

Low RF Version Pin Outline​
Figure 8361: Board Pinout for RAK811 Low RF
Low RF Version Pin Definition​
Pin No.NameTypeDescription
1GNDGround connections
2PB12/ADCI/OGPIO and ADC
3PB14/ADCI/OGPIO and ADC
4PB15/ADCI/OGPIO and ADC
5PB13/ADCI/OGPIO and ADC
6PA9/UART1_TXOUART1 Interface (AT Commands and FW Update)
7PA10/UART1_RXIUART1 Interface (AT Commands and FW Update)
8PA12I/OGPIO only
9PA11I/OGPIO only
10PA13I/OSWD debug pin (SWDIO)
11VCCPMain power voltage source input
12GNDGround connections
13PA14I/OSWD debug pin (SWCLK)
14PA15I/OGPIO only
15PA3I/OGPIO and ADC
16PB5I/OGPIO only
17BOOT0IBoot0 mode enable pin - high active
18PB6/I2C1_SCLI/OGPIO and I2C (SCL)
19PB7/I2C1_SDAI/OGPIO and I2C (SDA)
20PA2/ADCI/OGPIO and ADC
21GNDGround connections
22PA1/ADCI/OGPIO and ADC
23PA0/ADCI/OGPIO and ADC
24RSTIReset trigger input - low active
25PB10/UART3_TXI/OUART3 Interface (AT Commands)
26PB11/UART3_RXI/OUART3 Interface (AT Commands)
27BOOT1IBoot1 mode enable pin
28GNDGround connections
29GNDGround connections
30GNDGround connections
31GNDGround connections
32GNDGround connections
33RF_OUTI/ORF I/O port
34GNDGround connections
LoRa Transceiver IC Connection to RAK811(L) Internal STM32​
LoRa IC PinSTM32 GPIO
SX_D0PB4
SX_D1PB1
SX_D2PB9
SX_D3PH0
SX_D4PC13
SPI_SCLKPA5
SPI_MISOPA6
SPI_MOSIPA7
SPI_NSSPB0
SX_NRESETPA8
SX_GPIO0PH1
SX_RF_LFPB8
SX_RF_RXPB3
SX_RF_PAPA4
RF Switch Control Logic Table​
SX_RF_LFSX_RF_RXSX_RF_PACondition
010RX mode
001TX mode
2. High Radio Frequency Version (RAK811(H))​

High radio frequency hardware supports the regions of EU868, US915, AU915, KR920, AS923, and IN865. For more information, refer to the RF Characteristics.

High RF Version Pin Outline​
Figure 8362: Board Pinout for RAK811 High RF
High RF Version Pin Definition​
Pin No.NameTypeDescription
1GNDGround connections
2PB12/ADCI/OGPIO and ADC
3PB14/ADCI/OGPIO and ADC
4PB15/ADCI/OGPIO and ADC
5PA8I/OGPIO only
6PA9/UART1_TXOUART1 Interface (AT Commands and FW Update)
7PA10/UART1_RXIUART1 Interface (AT Commands and FW Update)
8PA12I/OGPIO only
9PB4I/OGPIO only
10PA13I/OSWD debug pin (SWDIO)
11VCCPMain power voltage source input
12GNDGround connections
13PA14I/OSWD debug pin (SWCLK)
14PA15I/OGPIO only
15PB3I/OGPIO only
16PB5I/OGPIO only
17BOOT0IBoot mode GPIO enable pin - high active
18PB8/I2C1_SCLI/OGPIO and I2C (SCL)
19PB9/I2C1_SDAI/OGPIO and I2C (SDA)
20PA2/ADCI/OGPIO and ADC
21GNDGround connections
22PA1/ADCI/OGPIO and ADC
23PA0/ADCI/OGPIO and ADC
24RSTIReset trigger input - low active
25PB10/UART3_TXI/OUART3 Interface (AT Commands)
26PB11/UART3_RXI/OUART3 Interface (AT Commands)
27PB2IBoot1 mode enable pin
28GNDGround connections
29GNDGround connections
30GNDGround connections
31GNDGround connections
32GNDGround connections
33RF_OUTI/ORF I/O port
34GNDGround connections
LoRa Transceiver IC Connection to RAK811(HF) Internal STM32​
LoRa IC PinSTM32 GPIO
SX_D0PA11
SX_D1PB1
SX_D2PA3
SX_D3PH0
SX_D4PC13
SPI_SCLKPA5
SPI_MISOPA6
SPI_MOSIPA7
SPI_NSSPB0
SX_NRESETPB13
SX_GPIO0PH1
SX_RF_HFPB7
SX_RF_RXPB6
SX_RF_PAPA4
RF Switch Control Logic Table​
SX_RF_HFSX_RF_RXSX_RF_PACondition
010RX mode
001TX mode

RF Characteristics​

Operating Frequencies​
ModuleRegionFrequency
RAK811(L)EuropeEU433
ChinaCN470
RAK811(H)EuropeEU868
North AmericaUS915
AustraliaAU915
KoreaKR920
AsiaAS923
IndiaIN865
FeatureConditionMinimumTypicalMaximumUnit
TransmitTX Power1420dBm
RX SensitivityRSSI-130dBm
SNR-15dB

Electrical Characteristics​

Schematic Diagram​

RAK811 supports two UARTs: UART1 (pin6-TX1, pin7-RX1) and UART3 (pin25-TX3, pin26-RX3). UART1 is used for upgrading firmware, so it is recommended that UART3 be used when connecting with external MCU.

Low Radio Frequency​
Figure 8363: RAK811 Low Frequency Schematic Diagram
Figure 8364: RAK811 Low Frequency Schematic Diagram
High Radio Frequency​
Figure 8365: RAK811 High Frequency Schematic Diagram
Figure 8366: RAK811 High Frequency Schematic Diagram
Reference Design​
Figure 8367: Reference Design
Operating Voltage​
FeatureMinimumTypicalMaximumUnit
VCC2.13.33.45Volts (V)
Operating Current​
FeatureConditionMinimumTypicalMaximumUnit
Operating CurrentTX Power30 (@ 14 dBm)mA
RX Mode5.5mA
Sleep Current​
FeatureConditionMinimum (2.1V)Typical (3.3V)MaximumUnit
Current ConsumptionEU8688.3711.9μA
US9151.1111.8μA
CN4701.653.07μA

Mechanical Characteristics​

Module Dimensions​
Figure 8368: RAK811 Physical Dimension
Layout Recommendation​
Figure 8369: RAK811 Layout

Environmental Characteristics​

Operating Temperature​
FeatureMinimumTypicalMaximumUnit
Operating Temperature-302585°C
Storage Temperature​
FeatureMinimumTypicalMaximumUnit
Storage Temperature-4085°C
Reflow Profile​

Referred to IPC/JEDEC standard:

  • MSL Rating : Class 3
  • Peak Temperature : < 250° C
  • Number of Times : ≤ 2 times
Figure 8370: Reflow Profile for RAK811

Software​

Download the latest firmware of the RAK811 WisDuo LPWAN Module — both in low and high frequency — provided in the table below.

NOTE

The bin file contains the application code only, and you need the RAK DFU Tool to upload this file to the module.

The hex file contains both the bootloader and the application code. You need to use STM32CubeProgrammer to upload this.

Firmware / OS​

ModelVersionSource
RAK811(L)V3.0.0.14.LDownload
RAK811(H)V3.0.0.14.HDownload

Certification​

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