RFM02 Datasheet, PDF (2/24 Pages) List of Unclassifed Manufacturers – Universal ISM Band FSK Transmitter

FEATURES
Fully integrated (low BOM, easy design-in)
No alignment required in production
Fast settling, programmable, high-resolution PLL
Fast frequency hopping capability
Stable and accurate FSK modulation with programmable deviation
Programmable PLL loop bandwidth
Direct loop antenna drive
Automatic antenna tuning circuit
Programmable output power level
SPI bus for applications with microcontroller
Clock output for microcontroller
Integrated programmable crystal load capacitor
Multiple event handling options for wake-up activation
Wake-up timer
Low battery detection
2.2V to 5.4V supply voltage
Low power consumption
Low standby current (0.3 µA)
Transmit bit synchronization
TYPICAL APPLICATIONS
Remote control
Home security and alarm
Wireless keyboard/mouse and other PC peripherals
Toy control
Remote keyless entry
Tire pressure monitoring
Telemetry
Personal/patient data logging
Remote automatic meter reading
RFM02
DETAILED FEATURE-LEVEL DESCRIPTION
The RFM02 FSK transmitter is designed to cover the unlicensed frequency bands at 433, 868, and
915 MHz. The device facilitates compliance with FCC and ETSI requirements.
PLL
The programmable PLL synthesizer determines the operating frequency, while preserving accuracy
based on the on-chip crystal-controlled reference oscillator. The PLL’s high resolution allows the usage of
multiple channels in any of the bands. The FSK deviation is selectable (from 30 to 210 kHz with 30 kHz
increments) to accommodate various bandwidth, data rate and crystal tolerance requirements, and it is
also highly accurate due to the direct closed-loop modulation of the PLL. The transmitted digital data can
be sent asynchronously through the FSK pin or over the control interface using the appropriate
command.
RF Power Amplifier (PA)
The power amplifier has an open-collector differential output and can directly drive a loop antenna
with a programmable output power level. An automatic antenna tuning circuit is built in to avoid costly
trimming procedures and the so-called “hand effect.”
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