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 1.8â€“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 ISMSensitivity = -121 dBmOutput power range: +20 dBm MaxData Rate = 0.123 to 256 kbpsFSK, GFSK, and OOK modulationPower Supply = 1.8 to 3.6 VUltra low power shutdown modeDigital RSSIWake-up timerAuto-frequency calibration (AFC)Power-on-reset (POR)Antenna diversity and TR switch controlConfigurable packet handlerPreamble detectorTX and RX 64 byte FIFOsLow battery detectorTemperature sensor and 8-bit ADCâ€“40 to +85 Â°C temperature rangeIntegrated voltage regulatorsFrequency hopping capabilityOn-chip crystal tuningDimensions: 16 x 16mm (0.63 x 0.63 in)Documents:DatasheetExample Code (ATmega328)
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