RFM42B FSK transmitter

RFM42B FSK transmitter

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HopeRF's RFM42B are highly integrated, low cost,433/868/915MHZ wireless ISM transmitters module. The RFM42B offers advanced radio features including adjustable power output levels of +1 to +20dBm,Power adjustments are made in 3dB steps,The RFM42B's high level of integration offers reduced BOM cost while implifying the overall system design. The RFM42Bs Industry leading +20dBm output power ensures extended range and improved link performance. Additional system features such as an automatic wake-up timer, low battery detector, 64 byte TX FIFO, and automatic packet handling reduce overall current consumption and allow the use of lower-cost system MCUs. An integrated temperature sensor, general purpose ADC, power-on-reset (POR), and GPIOs further reduce overall system cost and size. The direct digital transmit modulation and automatic PA power ramping ensure precise transmit modulation and reduced spectral spreading ensuring compliance with global regulations including FCC,ETSI regulations. 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: 433/868/915MHz ISM bands
  • Output Power Range: +1 to +20dBm (RFM42B)
  • Low Power Consumption:30 mA @ +13 dBm
  • 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
  • Wake-up timer
  • Integrated 32 kHz RC or 32 kHz XTAL
  • Integrated voltage regulators
  • Configurable packet handler
  • TX 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 cost
  • Power-on-reset (POR)


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


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