RAK2245 WisLink-LoRa Stamp Edition Datasheet
Overview
Description
The RAK2245 Stamp WisLink LPWAN Concentrator is a complete and cost efficient gateway solution base on Semtech SX1301 fully utilizing the LoRa System. This LPWAN Concentrator module supports eight channels and is available for all LoRaWAN international standard bands.
The Stamp form factor feature enables easy integration into the system's main board, providing LoRaWAN functionality. This ultra compact module measures just 60mm x 30mm x 14.9mm, believed to be the world’s smallest gateway module which has a built-in GPS chip. It comes with a mounted heat-sink that improves the thermal heat dissipation and overall performance of the device.
Overall, this gateway module is the most economical way to create different solutions like smart grids, intelligent farms and other IoT applications. It is also ideal for manufacturing small series that can expand into more applications.
Features
- Compatible with Stamp Edition specifications with mounted heat-sink
- SX1301 base band processor, emulates 49 x LoRa demodulators 10 parallel demodulation paths, support 8 uplinks channel, 1 downlink channel
- 2 x SX125X TX/RX front-ends high/ low frequency
- Supports 5 V power supply, integrated level conversion circuit
- TX power up to 27 dBm, RX sensitivity down to - 139 dBm @ SF12, BW 125 kHz
- Supports the LoRaWAN 1.0.2 protocol
- Supports global license-free frequency band (EU433, CN470, IN865, EU868, US915, AU915, KR920, and AS923)
- Supports SPI interface
- Integrated the Ublox MAX-7Q GPS Module
Specifications
Overview
The overview shows the top and back view of the RAK2245 Stamp Edition board. It also presents the block diagram that discusses how the board works.
Board Overview
The RAK2245 WisLink-LoRa Stamp Edition, as shown in Figure 1 below, has outer dimensions of 30.00 x 60.00 x 14.90 mm (nominal value) which includes the 9.50 mm heat sink.
Block Diagram
Hardware
The hardware is categorized into five (5) parts. It discusses the interfacing, pinouts and its corresponding functions and diagrams. It also covers the parameters and standard values of the board in terms of electrical and environmental.
Interfaces
The SX1301 digital baseband chip contains 10 programmable reception paths. These paths have different levels of programmability and have a variety of cases. It is important to understand the differences between those demodulation paths to make the best possible use of the system.
Power Supply
RAK2245 WisLink-LoRa Stamp Edition is powered through 5 V. It integrates the IOREF for Level Translator, which can communicate with 3.3 V, 1.8 V and other different voltage interfaces.
SPI Interface
The pin connector provides an SPI connection which allows direct access to the SX1301 SPI interface. This gives the target system the possibility to use existing SPI interfaces to communicate with the module.
Reset SX1301 via Pin A13 after turning on your RAK2245 WisLink-LoRa Stamp Edition.
UART and I²C
UART and I²C connections are also included on the pin connector. These connections allow direct access to the GPS module. The 1PPS is connected internally to SX1301.
Digital IOs
There are two digital IO PINs, which give the user an interface to reset the GPS module or set it into standby mode.
LEDs
3 x Green LED for indicating the status of PWR, TX, RX.
Antenna RF Interface
The modules have two RF interfaces for LoRa and GPS antennas over the standard UFL connectors (Hirose U. FL-R-SMT). It has a characteristic impedance of 50 Ω and supports both Tx and Rx via RF ports, providing the antenna interface.
Pin Definition
The pinout diagram for the RAK2245 WisLink-LoRa Stamp Edition is shown in Figure 3.
The pin connector of RAK2245 WisLink-LoRa Stamp Edition is located at the bottom side. Refer to the table below for the description and numbering of each pins.
| Pin | Name | Type | Description |
|---|---|---|---|
| A1 | GND | GND | GND |
| A2 | GND | GND | GND |
| A3 | +5V | POWER | +5 V Supply Voltage |
| A4 | IOREF | POWER | Supply Voltage for Level Translator |
| A5 | RESET_GPS | Input | GPS Module reset PIN |
| A6 | STANDBY_GPS | Input | GPS Module standby PIN |
| A7 | UART_TXD | UART | It should be connected to Main Board's UART_RXD, and this pin is connected to GPS Module's UART_TXD internally. |
| A8 | SPI_MOSI | SPI | It should be connected to Main Board's SPI_MOSI, and this pin has been connected to SX1301's SPI_MOSI internally. |
| A9 | SPI_CS | SPI | It should be connected to Main Board's SPI_CS, and this pin has been connected to SX1301's SPI_CS internally. |
| A10 | SPI_MISO | SPI | It should be connected to Main Board's SPI_MISO, and this pin has been connected to SX1301's SPI_MISO internally. |
| A11 | SPI_CLK | SPI | It should be connected to Main Board's SPI_CLK, and this pin has been connected to SX1301's SPI_CLK internally. |
| A12 | UART_RXD | UART | It should be connected to Main Board's UART_TXD, and this pin is connected to GPS Module's UART_RXD internally. |
| A13 | RST_BTN_N | RST | SX1301 RESET |
| A14 | GND | GND | GND |
| A15 | GND | GND | GND |
| B1 | GND | GND | GND |
| B2 | GND | GND | GND |
| B3 | SDA_GPS | I2C | GPS Module I2C SDA |
| B4 | SCL_GPS | I2C | GPS Module I2C SCL |
| B5 | GND | GND | GND |
| G1 | GND | GND | GND |
| G2 | GND | GND | GND |
| G3 | GND | GND | GND |
| G4 | GND | GND | GND |
| G5 | GND | GND | GND |
| G6 | GND | GND | GND |
| G7 | GND | GND | GND |
| G8 | GND | GND | GND |
RF Characteristics
Operating Frequencies
The board supports the following LoRaWAN frequency channels shown in the table below. The frequency parameter is easy to configure as you go through the device configuration setup.
| Region | Frequency (MHz) |
|---|---|
| Europe | EU433, EU868 |
| China | CN470 |
| North America | US915 |
| Asia | AS923 |
| Australia | AU915 |
| Korea | KR920 |
| India | IN865 |
Transmitter RF
The RAK2245 WisLink-LoRa Stamp Edition has an excellent transmitter performance. It is highly recommended to use an optimized configuration for the power level configuration, which is part of the HAL. This results in a mean RF output power level and current consumption.
| PA Control | DAC Control | MIX Control | DIG Gain | Normal RF Power Level (dBm) |
|---|---|---|---|---|
| 0 | 3 | 8 | 0 | -6 |
| 0 | 3 | 10 | 0 | -3 |
| 0 | 3 | 14 | 0 | 0 |
| 1 | 3 | 9 | 3 | 4 |
| 1 | 3 | 8 | 0 | 8 |
| 1 | 3 | 9 | 0 | 10 |
| 1 | 3 | 11 | 0 | 12 |
| 1 | 3 | 12 | 0 | 14 |
| 1 | 3 | 13 | 0 | 16 |
| 2 | 3 | 12 | 0 | 17 |
| 2 | 3 | 13 | 0 | 19 |
| 2 | 3 | 14 | 0 | 20 |
| 3 | 3 | 10 | 0 | 0 |
| 3 | 3 | 11 | 0 | 0 |
| 3 | 3 | 12 | 0 | 25 |
| 3 | 3 | 13 | 0 | 26 |
| 3 | 3 | 14 | 0 | 27 |
- At T=25° C, Vdd = 5 V (Typical) if nothing else stated
| Parameter | Condition | Min | Typical | Max |
|---|---|---|---|---|
| Frequency Range | - | 863 MHz | 870 MHz | |
| Modulation Techniques | FSK/LoRa | - | - | |
| TX Frequency Variation vs Temperature | Power Level Setting: 20 | -3 kHz | +3 kHz | |
| TX Power Variation vs. Temperature | - | -5 dBm | +5 dBm | |
| TX Power Variation | - | -1.5 dBm | +1.5 dBm |
Receiver RF
We recommended that you use optimized RSSI calibration values which are part of HAL v3.1. For both Radio 1 and 2, the RSSI-offset should be set to -169. The following table shows typical sensitivity level of RAK2245 WisLink-LoRa Stamp Edition -LPWAN Gateway Concentrator Module.
| Signal Bandwidth (kHz) | Spreading Factor | Sensitivity (dBm) |
|---|---|---|
| 125 | 12 | -139 |
| 125 | 7 | -126 |
| 250 | 12 | -136 |
| 250 | 7 | -123 |
| 500 | 12 | -134 |
| 500 | 7 | -120 |
Electrical Characteristics
The following are the electrical characteristics of RAK2245 WisLink-LoRa Stamp Edition. Contact RAK Support if you need other details for your project.
Absolute Maximum Rating
The values and range given below are all in accordance with the Absolute Maximum Rating System (IEC 134).
| Parameter | Description | Min | Typical | Max |
|---|---|---|---|---|
| Supply Voltage (VDD) | Input DC Voltage | -0.3 V | 5.0 V | 5.5 V |
| Operating Temperature | Temperature Range | -40° C | - | +85° C |
| RF Input Power | - | - | - | -15 dBm |
Stress exceeding of one or more of the limiting values listed under "Absolute Maximum Ratings" may cause permanent damage to the radio module.
Maximum ESD
The table below shows the maximum ESD.
| Parameter | Max | Remarks |
|---|---|---|
| ESD sensitivity for all pins except ANT | 1000 V | Human Body Model according to JESD22-A 114 |
| ESD sensitivity for ANT | 1000 V | Human Body Model according to JESD22-A 114 |
| ESD immunity for ANT | 4000 V | Contact Discharge according to IEC 61000-4-2 |
| 8000 V | Air Discharge according to IEC 61000-4-2 |
The module is an Electrostatic Sensitive Device and requires special precautions when handling.
Power Consumption
| Mode | Condition | Typical |
|---|---|---|
| Active-Mode (TX) | TX Enabled and RX Disabled | 336 mA |
| Active-Mode (RX) | TX Disabled and RX Enabled | 360 mA |
Environmental Requirements
Operating Conditions
The table below shows the operation temperature range.
| Parameter | Min | Typical | Max | Remarks |
|---|---|---|---|---|
| Normal Operating Temperature | -40° C | +25° C | +85° C | Normal operating temperature range (fully functional and meets 3GPP specifications) |
Mechanical Characteristics
Firmware
Download the latest firmware of RAK2245 Stamp in the table provided below.
| Model | Source |
|---|---|
| RAK2245 Stamp | Download |
Certification
CE Certification
FCC Certification
RoHS Certification
