RFM219SW Datasheet, PDF (10/35 Pages) List of Unclassifed Manufacturers – Wireless Alarm and Security Systems

RFM219SW
5. Functional Descriptions
RFIN
GND
VDD
GND
I-MXR
LNA
Q-MXR
LO GEN
LDOs
Bandgap
POR
Image
Rejection
Band-pass
Filter
I-LMT
AGC
RSSI
SAR
DEMOD
AFC & AGC
VCO
Q-LMT
Loop
Filter
PFD/CP
26 MHz
Divider
AFC & Σ-Δ Modulator
VCON VCOP
Radio
Controller
4-wire SPI,
FIFO
Interface
EEPROM
LPOSC
XOSC
IO Control
XIN XOUT
Figure 10. Functional Block Diagram
FCSB
CSB
SCL
SDA
GPO1
GPO2
GPO3
GPO4
5.1 Overview
The RFM219SW is an ultra low power, high performance, OOK and (G)FSK RF receiver for various 300 to 960 MHz wireless
applications. It is part of the HOPERF NextGenRF^TM family, which includes a complete line of transmitters, receivers and
transceivers. The device is based on a fully integrated, low-IF receiver architecture. The low-IF architecture facilitates a very low
external component count and does not suffer from powerline - induced interference problems. The RF signal coming from
antenna is amplified, down-converted, filtered and further amplified in analog domain before sending into the digital demodulator.
The synthesizer contains a VCO and a low noise fractional-N PLL with an output frequency resolution of 24.8 Hz. The VCO
operates at 2x the Local Oscillator (LO) frequency to reduce spurious emissions. Every analog block is calibrated on each
Power-on Reset (POR) to the internal reference voltage. The calibration helps the device to finely work under different
temperatures and supply voltages. The baseband filtering and demodulation is done by the digital demodulator. The device
supports packet handling, 32-byte FIFO, Manchester decoding and data de-whitening for the received data processing. Besides
the demodulated data and the sync clock, the device can also send out the power-on reset, the system clock, as well as 2
configurable interrupts for the external device.
The 4-wire SPI interface is not only used for configuring the device by programming the EEPROM, but also controlling the device
by the external MCU. All features can be configured either by off-line EEPROM programming or on-line registers writing. The
configuration file to be written into the registers is generated by the smart RFPDK. The RF Frequency, symbol rate and other
product features are all configurable. This saves the cost and simplifies the design, development and manufacture. The
RFM219SW operates from 1.8 to 3.6 V so that it can finely work with most batteries to their useful power limits. The receive
current is only 5.7 mA while achieving -109 dBm receiving sensitivity (FSK @ 868.35 MHz FRF, 9.6 ksps SR), and only 60 nA
sleep current for superior battery life. The RFM219SW receiver together with the CMT2119A transmitter enables a powerful RF
link.
5.2 Modulation, Frequency and Symbol Rate
The RFM219SW supports OOK demodulation with the symbol rate from 0.1 to 40 ksps and (G)FSK demodulation with the
symbol rate from 0.1 to 100 ksps. It continuously covers the frequency range from 300 to 960 MHz, including the license free
ISM frequency band around 315 MHz, 433.92 MHz, 868.35 MHz and 915 MHz. The internal frequency synthesizer contains a
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