SX1278 wireless module features and pin functions

**Introduction to SX1278** The SX1278 is a low-IF transceiver designed for half-duplex communication. It begins by amplifying the incoming RF signal through a low-noise amplifier (LNA), which is connected in a single-ended configuration. The signal is then converted into a differential form to enhance the second harmonic performance before being down-converted to an intermediate frequency (IF) in-phase and quadrature (I&Q) signals. These signals are then digitized via an ADC, and further processing, including demodulation, takes place in the digital domain. The digital state machine also manages key functions such as Automatic Frequency Correction (AFC), Received Signal Strength Indication (RSSI), and Automatic Gain Control (AGC). The device features a frequency synthesizer that provides local oscillator signals for both the receiver and transmitter. One synthesizer covers the UHF low band, while the other supports the high band above 860 MHz. The SX1278 includes three distinct RF power amplifiers, each connected to different output pins: RFO_LF, RFO_HF, and PA_BOOST. These support low-frequency bands at 169 MHz and 433 MHz, as well as high-frequency bands from 868 MHz to 915 MHz. The chip has two timing references: an internal RC oscillator and a 32 MHz crystal. All critical parameters of the RF front-end and the digital state machine can be configured through an SPI interface. The configuration registers of the SX1278 are accessible via this same SPI connection, offering flexible control over the module’s operation. **SX1278 Features** The SX1278 operates on a 3.3V power supply and uses a 32 MHz crystal for accurate timing. It supports low-band frequencies of 169 MHz and 433 MHz, as well as high-band frequencies between 868 MHz and 915 MHz. The module offers a bandwidth of 125 kHz, with a spreading factor of 12, and an error correction rate of 4/6. It can handle packet lengths up to 64 bytes, with a programmable sequence length of up to 12 symbols (or 8 if configured). The SPI communication clock runs at 10 MHz, and the pin change time is in the nanosecond range. A higher spreading factor increases transmission time, making it ideal for long-range applications. When the bandwidth is below 62.5 kHz, a TCXO is recommended as the reference clock source. In sleep mode, the FSK modem can be switched to LoRa mode using the RegOpMode register. **SX1278 Block Diagram**
SX1278 wireless module features and pin functions
**SX1278 Package Identifier**
SX1278 wireless module features and pin functions
**SX1278 Working Conditions**
SX1278 wireless module features and pin functions
**SX1278 Wireless Module Features** - LoRaâ„¢ modulation - Maximum link budget of 168 dBm - +20 dBm and 100 mW RF output - High-efficiency power amplifier up to +14 dBm - Programmable bit rate up to 300 kbps - High sensitivity down to -148 dBm - Low receive current of 9.9 mA, 200 nA in register mode - Fully integrated FSK, GFSK, MSK, LoRaâ„¢, and OOK modulation - Built-in bit synchronizer for clock recovery - Preamble detection - 127 dBm dynamic range signal strength indicator - Automatic RF detection and ultra-fast CAD for automatic frequency control - CRC check up to 256 bytes - Built-in temperature sensor and low-voltage indicator **SX1278 Pin and Pin Description**

Introduction to SX1278
Introduction to SX1278

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