RFM31B FSK receiver

RFM31B FSK receiver

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Other pin/package combinations may be available.

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HopeRF's RFM31B are highly integrated, low cost,433/868/915MHZ wireless ISM receiver module.The low receive sensitivity (ĘC121dBm) ensures extended range and improved link performance. Built-in antenna diversity and support for frequency hopping can be used to further extend range and enhance performance. Additional system features such as an automatic wake-up timer, low battery detector, 64 byte RX FIFO, automatic packet handling, and preamble detection reduce overall current consumption and allow the use of a lower-cost system MCU. An integrated temperature sensor, general purpose ADC, power-on-reset (POR), and GPIOs further reduce overall system cost and size. The RFM31B's digital receive architecture features a high-performance ADC and DSP based modem which performs demodulation, filtering, and packet handling for increased flexibility and performance. An easy-to-use calculator is provided to quickly configure the radio settings, simplifying customer's system design and reducing time to market.



  • Frequency Range
  • Sensitivity = –121 dBm
  • Low Power Consumption: 18.5 mA
  • Data Rate = 0.123 to 256 kbps
  • FSK, GFSK, and OOK modulation
  • Power Supply = 1.8 to 3.6 V
  • Ultra low power shutdown mode
  • Digital RSSI
  • Wake-up timer
  • Auto-frequency calibration (AFC)
  • Clear channel
  • Programmable assessment RX BW 2.6–620 kHz
  • Programmable packet handler
  • Programmable GPIOs
  • Embedded antenna diversity algorithm
  • Configurable packet handler
  • Preamble detector
  • RX 64 byte FIFO
  • Low battery detector
  • Temperature sensor and 8-bit ADC
  • –40 to +85 °C temperature range
  • Integrated voltage regulators
  • Frequency hopping capability
  • On-chip crystal tuning
  • Low BOM
  • Power-on-reset (POR)


  • Remote control
  • Home security & alarm
  • Telemetry
  • Personal data logging
  • Toy control
  • Tire pressure monitoring
  • Wireless PC peripherals
  • Remote meter reading
  • Remote keyless entry
  • Home automation
  • Industrial control
  • Sensor networks
  • Health monitors
  • Tag readers


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