EBYTE E28-2G4M12SX SX1281 LoRa Wireless Module User Manual

1. Introducción

The EBYTE E28-2G4M12SX is a 2.4GHz wireless module designed for long-distance communication with ultra-low power consumption. This SMD module integrates the SX1281 RF chip, offering multiple physical layers and modulation methods including LoRa, FLRC, and GFSK. It is suitable for a wide range of applications such as smart home systems, security, tracking, and wireless distance measuring. This manual provides essential information for the proper setup, operation, and maintenance of the module.

2. Producto terminadoview

The E28-2G4M12SX module is a compact SMD component featuring a built-in PCB antenna and an IPEX antenna connector for external antenna options. It utilizes a high-precision 52MHz crystal for stable performance.

Figure 2.1: EBYTE E28-2G4M12SX LoRa Wireless Module. This image shows the top view of the E28-2G4M12SX module, highlighting its compact size (22mm x 19mm) and the EBYTE branding.

2.1 Características principales

• Microprocesador de radiofrecuencia: Based on Semtech SX1281, supporting LoRa, FLRC, and GFSK modulation.
• Frecuencia: Banda de 2.4 GHz.
• Distancia de comunicación: Up to 3km (tested).
• Potencia de transmisión: Maximum 18mW, software multi-level adjustable.
• Velocidad de datos: Supports air data rates from 0.476kbps to 2Mbps.
• BLE Compatibility: Compatible with Bluetooth Low Energy protocol.
• Función de rango: Integrated Time-of-Flight (ToF) for distance measurement with accuracy as high as 1m.
• Fuente de alimentación: 1.8V to 3.6V (optimal performance above 3.3V).
• Temperatura de funcionamiento: Industrial grade standard design, -40°C to 85°C.
• Opciones de antena: IPEX and PCB antenna.
• Primero en entrar: Large capacity 256-Byte data buffer.

Figure 2.2: E28 Module Practical Functions. This diagram illustrates the key functionalities of the E28 module, including BLE protocol compatibility, multiple modulation modes (GFSK, FLRC, LoRa), ranging engine, and high-speed LoRa capabilities.

Figure 2.3: SX1280 2.4G LoRa Spread Spectrum. This image highlights the SX1280 chip solution, emphasizing its various physical layers and modulation methods (LoRa, FLRC, GFSK) for increased transmission distance and high-speed IoT performance. It also includes a note about the SPI hardware module.

3. Especificaciones

3.1 Internal Components and Quality

The E28-2G4M12SX module is built with high-quality components to ensure reliable performance. It features an original Semtech SX1280 chip solution, an industrial-grade high-precision low-temperature crystal oscillator, and carefully selected high-line brand capacitive and inductive devices. The design also incorporates impedance matching for optimal signal integrity.

Figure 3.1: Internal Components and Quality Features. This image displays the internal components of the module, highlighting the original Semtech SX1280 chip, industrial-grade crystal oscillator, impedance matching, and high-quality capacitive and inductive devices.

4. Pin Definitions and Circuit Diagram

The E28-2G4M12SX module communicates via an SPI interface. Proper connection to a Microcontroller Unit (MCU) is crucial for its operation. Below is a typical circuit diagram illustrating the pin connections.

Figure 4.1: E28-2G4M12SX Circuit Diagram. This diagram shows the typical wiring connections between the E28-2G4M12S module (U2) and an STM32L476 microcontroller (U1), detailing the SPI, GPIO, and power supply pins.

4.1 Descripciones de pines

• CCV: Power supply input (1.8V-3.6V).
• TIERRA: Conexión a tierra.
• MOSI: Master Out Slave In (SPI data output from MCU, input to module).
• MISO: Master In Slave Out (SPI data input to MCU, output from module).
• SCK: Serial Clock (SPI clock signal).
• Sistema de Seguridad Nacional: Slave Select (SPI chip select, active low).
• DIOx: Digital I/O pins, configurable for various functions (e.g., interrupt, busy status).
• NRESET: Reset pin (active low).

5. Configuración y programación

The E28-2G4M12SX is a pure RF transceiver module. It requires an external MCU to drive it and configure its registers via the SPI interface. Users must perform secondary development based on their specific application requirements.

5.1 Pasos de configuración inicial

1. Conexión de energía: Connect VCC to a stable power supply within the 1.8V to 3.6V range and GND to the system ground. Ensure the power supply can provide sufficient current.
2. Interfaz SPI: Connect the MOSI, MISO, SCK, and NSS pins of the module to the corresponding SPI pins on your MCU.
3. Conexiones GPIO: Connect the DIOx pins and NRESET to appropriate GPIOs on your MCU for control and status monitoring.
4. Antena: Connect an appropriate 2.4GHz antenna to the IPEX connector, or utilize the integrated PCB antenna.

5.2 Programming Guidelines

• Comunicación SPI: Implement SPI communication routines on your MCU to read from and write to the SX1281's internal registers.
• Configuración del registro: Configure the SX1281 registers for desired modulation mode (LoRa, FLRC, GFSK), frequency, spreading factor, bandwidth, coding rate, and transmission power.
• Manejo de paquetes: Develop routines for sending and receiving data packets, including CRC checks and addressing if required.
• Función de rango: For Time-of-Flight ranging, refer to the SX1281 datasheet for specific register settings and calculation methods.
• Protocolo BLE: If using BLE, ensure your MCU firmware implements the necessary BLE stack and protocols.

6. Operating Modes and Modulation

The SX1281 chip supports various modulation methods, allowing flexibility for different application requirements.

• Modo LoRa: Offers long-range communication with high interference immunity, ideal for IoT applications where distance and reliability are critical.
• Modo FLRC: Provides high-speed data transmission with strong anti-interference performance, achieving up to 1.3 Mbps.
• Modo GFSK: Standard frequency shift keying, compatible with BLE protocol, suitable for shorter-range, higher-data-rate applications.

6.1 Ranging Function (Time-of-Flight)

The SX1281 integrates a Time-of-Flight (ToF) engine, enabling precise distance measurement. This feature is particularly useful for applications requiring location tracking or proximity sensing. The accuracy can be as high as 1 meter under optimal conditions.

7. Consumo de corriente

Understanding the module's current consumption is vital for power-sensitive applications. The E28-2G4M12SX is designed for ultra-low power operation.

Figure 7.1: Agilent 34410A Current Test Results. This graph illustrates the current consumption of the module in different states: Emission current (approx. 80.7956 mAdc), Receive current (approx. 13.3244 mAdc), and Sleep current (approx. 0.6009 µAdc).

• Corriente de emisión: Approximately 80.7956 mAdc during transmission.
• Recibir corriente: Approximately 13.3244 mAdc during reception.
• Corriente de sueño: Approximately 0.6009 µAdc in low-power sleep mode.

8. Escenarios de aplicación

The versatility of the E28-2G4M12SX module makes it suitable for a broad range of wireless applications.

Figure 8.1: EBYTE Wireless Product Application Scenarios. This image displays various applications for EBYTE wireless products, including Industrial Manufacturing, Smart Home, Smart Farm, and Hotel Solutions.

• Hogar inteligente: Home security alarm systems, remote keyless entry, smart sensors, building automation.
• Aplicaciones industriales: Wireless industrial-grade remote control, short-distance replacement of signal cables, data acquisition.
• Granja inteligente: Accurate monitoring of environmental details, statistical management, and risk detection.
• Tracking and Locating: Asset tracking, wireless distance measuring, wearable electronics, smart bracelets.
• Manejo de la salud: Health care products, advanced meter reading architecture (AMI).

9. Mantenimiento

To ensure the longevity and optimal performance of your E28-2G4M12SX module, follow these maintenance guidelines:

• Condiciones ambientales: Operate the module within the specified temperature and humidity ranges. Avoid extreme conditions.
• Fuente de alimentación: Use a stable and clean power supply. Voltage fluctuations can affect performance and module lifespan.
• Manejo físico: Handle the module with care to prevent physical damage to pins or components. Use anti-static precautions during handling and installation.
• Limpieza: If necessary, gently clean the module with a soft, dry, anti-static brush. Avoid liquids or harsh chemicals.
• Actualizaciones de firmware: Keep your MCU firmware updated with the latest drivers and configurations for the SX1281 chip, as provided by EBYTE or Semtech, to benefit from performance improvements and bug fixes.

10. Solución de problemas

This section addresses common issues you might encounter with the E28-2G4M12SX module.

11. Garantía y soporte

EBYTE provides technical support and warranty services for its products. For detailed warranty information, technical assistance, or further inquiries, please contact EBYTE directly or visit their official websitio.

Oficial Websitio: http://www.cdebyte.com/

When seeking support, please provide your module model (E28-2G4M12SX) and a detailed description of the issue.