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RFM24W Schematic ( PDF Datasheet ) - HOPERF

Teilenummer RFM24W
Beschreibung ISM Transceiver module
Hersteller HOPERF
Logo HOPERF Logo 




Gesamt 30 Seiten
RFM24W Datasheet, Funktion
RFM24W
RFM24W ISM Transceiver module
Features
Frequency range = 142–1050 MHz
Receive sensitivity = –126 dBm
Modulation
(G)FSK & 4(G)FSK
OOK & ASK
+11 dBmMax output power
Low active power consumption
10/13 mA RX
19 mA TX at +10 dBm
Ultra low current powerdown modes
30 nA shutdown, 50 nA standby
Data rate = 0.123 kbps to 1Mbps
Fast wake and hop times
Power supply = 1.8 to 3.6 V
Excellent selectivity performance
50 dB adjacent channel
> 73 dB blocking at 1 MHz
Antenna diversity and T/R switch control
Highly configurable packet handler
TX and RX 64 byte FIFOs
Auto frequency control (AFC)
Automatic gain control (AGC)
Low Battery Detector
Low BOM
Temperature Sensor
Applications
Smart metering (802.15.4g & Mbus)
Remote control
Home security and alarm
Telemetry
Garage and gate openers
Remote keyless entry
Home automation
Industrial control
Sensor networks
Health monitors
Description
The RFM24W module is high-performance, low current transceiver covering
the sub-GHz frequency bands from 142 to1050 MHz. It offers
outstanding sensitivity of –126 dBm while achieving extremely low active
and standby current consumption. The RFM24W offers continuous frequency
coverage across the entire sub-GHz band from 142–1050 MHz with
extremely fine frequency resolution. The RFM24W offers exceptional output
power of up to +11 dBm with outstanding TX efficiency. The high output
power and sensitivity results in an industry leading link budget of 137 dB
allowing extended ranges and highly robust communication links. Its active
mode TX current consumption of 19 mA at +11 dBm and RX current of 10
mA coupled with extremely low standby current and fast wake times ensure
extended battery life in the most demanding applications. The module is
compliant with all worldwide regulatory standards: FCC, ETSI, and ARIB.
All devices are designed to be compliant with 802.15.4g and WMbus smart
metering standards.
V 1.1
RFM24W
Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: [email protected] http:/ / www.hoperf.com
1






RFM24W Datasheet, Funktion
RFM24W
Table 3. Receiver AC Electrical Characteristics1
Parameter
RX Frequency
Range
RX Sensitivity
RX Channel Bandwidth2
BER Variation vs Power
Level2
RSSI Resolution
±1-Ch Offset Selectivity2
±2-Ch Offset Selectivity2
Symbol
FRX
PRX-_2
PRX-_40
PRX-_100
PRX-_125
PRX-_500
PRX-_1M
PRX-_OOK
BW
PRX_RES
Conditions
(BER < 0.1%)
(500 bps, GFSK, BT = 0.5,
Δf = ±250Hz)2
(BER < 0.1%)
(40 kbps, GFSK, BT = 0.5,
Δf = ±20 kHz)2
(BER < 0.1%)
(100 kbps, GFSK, BT = 0.5,
Δf = ±50 kHz)2
(BER < 0.1%)
(125 kbps, GFSK, BT = 0.5,
Δf = ±62.5 kHz)
(BER < 0.1%)
(500 kbps, GFSK, BT = 0.5,
Δf = ±250 kHz)
(PER 1%)
(1 Mbps, 4GFSK, BT = 0.5,
Δf = ±ΤΒΔ kHz)
(BER < 0.1%, 4.8 kbps, 350 kHz BW,
OOK, PN15 data)2
(BER < 0.1%, 40 kbps, 350 kHz BW,
OOK, PN15 data)2
(BER < 0.1%, 120 kbps, 350 kHz BW,
OOK, PN15 data)2
Up to +5 dBm Input Level
Min
142
284
425
850
1.1
RESRSSI
C/I1-CH
C/I2-CH
Desired Ref Signal 3 dB above sensitiv-
ity, BER < 0.1%. Interferer and desired
modulated with 2.4 kbps ΔF = 1.2 kHz
GFSK with BT = 0.5, channel spacing =
25 kHz
Typ
–126
Max
175
350
525
1050
Units
MHz
MHz
MHz
MHz
dBm
–110 — dBm
–106 — dBm
–103 — dBm
–97 — dBm
–88 — dBm
–110 — dBm
–102 — dBm
–99 — dBm
— 850 kHz
0 0.1 ppm
±0.5 — dB
–50 — dB
–52 — dB
Notes:
1. All specification guaranteed by production test unless otherwise noted. Production test conditions and max limits are
listed in the "Production Test Conditions" section in "1.1. Definition of Test Conditions" on page 11.
2. Guaranteed by qualification. Qualification test conditions are listed in the "Qualification Test Conditions" section in "1.1.
Definition of Test Conditions" on page 11.
Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: [email protected] http:/ / www.hoperf.com
6

6 Page









RFM24W pdf, datenblatt
RFM24W
2. Functional Description
The RFM24W module is high-performance, low-current, wireless ISM transceivers that cover the sub-GHz bands.
The wide operating voltage range of 1.8–3.6 V and low current consumption make the RFM24W an ideal solution
for battery powered applications. The RFM24W operates as a time division duplexing (TDD) transceiver where
the device alternately transmits and receives data packets. The device uses a single-conversion mixer to
downconvert the 2/4-level FSK/GFSK or OOK/ASK modulated receive signal to a low IF frequency. Following a
programmable gain amplifier (PGA) the signal is converted to the digital domain by a high performance ∆Σ ADC
allowing filtering, demodulation, slicing, and packet handling to be performed in the built-in DSP increasing the
receiver’s performance and flexibility versus analog based architectures. The demodulated signal is output to the
system MCU through a programmable GPIO or via the standard SPI bus by reading the 64-byte RX FIFO.
A single high precision local oscillator (LO) is used for both transmit and receive modes since the transmitter and
receiver do not operate at the same time. The LO is generated by an integrated VCO and ∆Σ Fractional-N PLL
synthesizer. The synthesizer is designed to support configurable data rates from 0.123 kbps to 1 Mbps. The
RFM24W operates in the frequency bands of 142–175, 283–350, 425–525, and 850–1050 MHz with a
maximum accuracy of 57.22 Hz frequency accuracy. The transmit FSK data is modulated directly into the ∆Σ data
stream and can be shaped by a Gaussian low-pass filter to reduce unwanted spectral content.
The RFM24W is designed to support single coin cell operation with current consumption below 19 mA for +10
dBm output power. Two match topologies are available for the RFM24W, class-E and switched-current. Class-E
matching provides optimal current consumption, while switched-current matching demonstrates the best
performance over varying battery voltage with slightly higher current consumption. The PA is single-ended to
allow for easy antenna matching and low BOM cost. The PA incorporates automatic ramp-up and ramp-down
control to reduce unwanted spectral spreading. The RFM24W supports frequency hopping, TX/RX switch control,
and antenna diversity switch control to extend the link range and improve performance. Built-in antenna diversity
and support for frequency hopping can be used to further extend range and enhance performance. Antenna
diversity is completely integrated into the RFM24W and can improve the system link budget by 8–10 dB,
resulting in substantial range increases under adverse environmental conditions. A highly configurable packet
handler allows for autonomous encoding/decoding of nearly any packet structure. Additional system features,
such as an automatic wake-up timer, low battery detector, 64 byte TX/RX FIFOs, and preamble detection, reduce
overall current consumption and allows for the use of lower-cost system MCUs. An integrated temperature sensor,
power-on-reset (POR), and GPIOs further reduce overall system cost and size. The RFM24W is designed to work
with an MCU, crystal, and a few passives to create a very low-cost system.
Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: [email protected] http:/ / www.hoperf.com
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