Lora Module SPI controllable

Lora Module SPI controllable

RC-SM1276-868 based on Semtech SX1276


It’s a SX1276 LoRa module with SPI interface. CE certified.

The RC-SM1276-868 module is designed based on SX1276. The SX1276 incorporates the LoRaTM spread spectrum modem which is capable of achieving significantly longer range than existing systems based on FSK or OOK modulation. At maximum data rates of LoRaTM the sensitivity is 8dB better than FSK, but using a low cost bill of materials with a 20ppm XTAL LoRaTM can improve receiver sensitivity by more than 20dB compared to FSK. LoRaTM also provides significant advances in selectivity and blocking performance, further improving communication reliability. For maximum flexibility the user may decide on the spread spectrum modulation bandwidth (BW), spreading factor (SF) and error correction rate (CR). Another benefit of the spread modulation is that each spreading factor is orthogonal - thus multiple transmitted signals can occupy the same channel without interfering. This also permits simple coexistence with existing FSK based systems. Standard GFSK, FSK, OOK, and GMSK modulation is also provided to allow compatibility with existing systems or standards such as wireless MBUS and IEEE 802.15.4g.


  • LoRaTM Modem
  • 168 dB maximum link budget
  • +20 dBm - 100 mW constant RF output vs. V supply Ÿ +14 dBm high efficiency PA
  • Programmable bit rate up to 300 kbps
  • High sensitivity: down to -148 dBm
  • Bullet-proof front end: IIP3 = -11 dBm
  • Excellent blocking immunity
  • Low RX current of 9.9 mA, 200 nA register retention
  • Fully integrated synthesizer with a resolution of 61 Hz
  • FSK, GFSK, MSK, GMSK, LoRaTMand OOK modulation
  • Built-in bit synchronizer for clock recovery
  • Preamble detection
  • 127 dB Dynamic Range RSSI
  • Automatic RF Sense and CAD with ultra-fast AFC
  • Packet engine up to 256 bytes with CRC
  • Built-in temperature sensor and low battery indicator


  • Automatic Measure Reading.
  • Home and Building Automation.
  • Wireless Security Systems.
  • Home and Building Automation

Block Diagram

Technical Characteristics MIN TYP MAX UNIT
Supply Voltage  1.8    3.7 Volt
 Supply Current RX mode LnaBoost OFF, band1    10.8    mA
 Supply Current RX mode LnaBoost ON, band1    11.5    mA
 Supply Current RX mode Bands 2&3    12.0    mA
 Supply Current  Sleep Mode    0.2  1.0  µA
 Supply Current Idle mode (RC Osc. enabled)    1.5    µA
 Supply Current  Standby Mode (Crystal enabled)    1.6    µA
 Supply Current  Transmit Mode RFOP=dBm    120     mA
 RF Power Output (for LORA modulation)        +19  dBm
 RF Sensitivity (for LORA modulation)    -130      dBm
Operating Temperature Range -40   +85 °C





Pads  Name  Description
 1  TX_EN  RF Swith Control : High in TX
 2  VDD  Power Supply 1.8 to 3.7Vdc
 3  GND  Ground
 4  GND  Ground
 5  NRESET  Reset Trigger Input
 6  DIO 0  Digital I/O
 7  DIO 1/DCLK  Digital I/O
 8  DIO 2/DATA  Digital I/O
 9  DIO 3  Digital I/O
 10  DIO 4  Digital I/O
 11  DIO 5  Digital I/O
 12  SCK  SPI Clock Input
 13  MISO  SPI Data Output
 14  MOSI  SPI Data Input
 15  NSS  SPI Chip Select Input
 16  RXTX/RF_MOD  RX/TX Switch Control : High in TX
 17  NC  Not connected
 18  RX_EN  RF Switch Control : High in RX





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