RFM66W Datasheet, PDF (18/87 Pages) List of Unclassifed Manufacturers – 868 & 915MHz Ultra Low Power High Link Budget Integrated UHF Transceiver

WIRELESS & SENSING
RFM66W
DATASHEET
RFM66W features a pair of RF power amplifiers. The first, connected to RFO, can deliver up to +14 dBm, is unregulated
for high power efficiency and can be connected directly to the RF receiver input via a pair of passive components to form
a single antenna port high efficiency transceiver. The second PA, connected to the PA_BOOST pin and can deliver up to
+20 dBm via a dedicated matching network.
RFM66W also includes two timing references: an RC oscillator and a 32 MHz crystal oscillator.
All major parameters of the RF front end and digital state machine are fully configurable via an SPI interface which gives
access to internal registers. This includes a mode auto sequencer that oversees the transition and calibration of the
RFM66W between intermediate modes of operation in the fastest time possible.
3.1. Power Supply Strategy
The RFM66W employs an advanced power supply scheme, which provides stable operating characteristics over the full
temperature and voltage range of operation. This includes the full output power of +17dBm which is maintained from 1.8 to
3.7 V.
The RFM66W can be powered from any low-noise voltage source via pins VBAT1 and VBAT2. Decoupling capacitors
should be connected, as suggested in the reference design, on VR_PA, VR_DIG and VR_ANA pins to ensure a correct
operation of the built-in voltage regulators.
3.2. Low Battery Detector
A low battery detector is also included allowing the generation of an interrupt signal in response to passing a
programmable threshold adjustable through the register RegLowBat. The interrupt signal can be mapped to any of the DIO
pins, by programming RegDioMapping.
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