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.

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)

Documents:

• Datasheet
• Example Code (ATmega328)

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