The RFM22B is a low-cost ISM FSK transceiver module which offers communication at 915MHz ISM and adjustable output power of up to +20 dBm. The wide operating voltage range of 1.8–3.6 V and low current consumption makes the RFM22B an ideal solution for battery powered applications.

Communication with the RFM22B is achieved via a standard 4-wire SPI interface. Three configurable general purpose I/Os are also available, the use of which can be tailored towards the needs of your project. A host of other features are also available including an 8-bit ADC, temperature sensor, RX and TX FIFOs, and low-battery detection. See the datasheet below for a complete description of every register and command.

The module comes in a 16-pin, 16 x 16mm, SMD package, with pins spaced by 2mm. Look for a breakout board coming soon!

Note: These modules are 915MHz and Rev3.0.

Features:
  - Frequency Range: 915MHz ISM
  - Sensitivity = -121 dBm
  - Output power range: +20 dBm Max
  - 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)
  - Power-on-reset (POR)
  - Antenna diversity and TR switch control
  - Configurable packet handler
  - Preamble detector
  - TX and RX 64 byte FIFOs
  - 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
  - Dimensions: 16 x 16mm (0.63 x 0.63 in)