RFM22B-S2 SMD Wireless Transceiver - 915MHz

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 * 16 x 16mm (0.63 x 0.63 in)

**Documents:**

* [Datasheet](http://www.sparkfun.com/datasheets/Wireless/General/RFM22B.pdf) * [Example Code](http://www.sparkfun.com/datasheets/BreakoutBoards/RFM22-Example-Code.zip) (ATmega328)