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RFM01 Schematic ( PDF Datasheet ) - HOPERF

Teilenummer RFM01
Beschreibung Universal ISM Band FSK Receiver
Hersteller HOPERF
Logo HOPERF Logo 




Gesamt 30 Seiten
RFM01 Datasheet, Funktion
RFM01 Universal ISM
Band FSK Receiver
DESCRIPTION
Hoperf’ RFM01 is a single module, low power, multi-channel FSK
receiver designed for use in applications requiring FCC or ETSI
conformance for unlicensed use in the 315, 433, 868, and 915 MHz
bands. Used in conjunction with RFM02, Hoperf’ FSK transmitters,
the RFM01 is a flexible, low cost, and highly integrated solution that
does not require production alignments. All required RF functions are
integrated. Only an external crystal and bypass filtering are needed for
operation.
The RFM01 has a completely integrated PLL for easy RF design, and its
rapid settling time allows for fast frequency hopping, bypassing multipath
fading, and interference to achieve robust wireless links. The PLL’s high
resolution allows the usage of multiple channels in any of the bands. The
baseband bandwidth (BW) is programmable to accommodate various
deviation, data rate, and crystal tolerance requirements. The receiver
employs the Zero-IF approach with I/Q demodulation, therefore no external
components (except crystal and decoupling) are needed in a typical
application. The RFM01 is a complete analog RF and baseband receiver
including a multi-band PLL synthesizer with an LNA, I/Q down converter
mixers, baseband filters and amplifiers, and I/Q demodulator.
The Module dramatically reduces the load on the microcontroller
with integrated digital data processing: data filtering, clock recovery, data
pattern recognition and integrated FIFO. The automatic frequency control
(AFC) feature allows using a low accuracy (low cost) crystal. To minimize
the system cost, the chip can provide a clock signal for the microcontroller,
avoiding the need for two crystals.
For simple applications, the receiver supports a standalone operation
mode. This allows complete data receiver operation and control of four
digital outputs based on the incoming data pattern without a
microcontroller. In this mode, 12 or more predefined frequency channels
can be used in any of the four bands. For low power applications, the
device supports low duty-cycle operation based on the internal wake-up
timer.
FUNCTIONAL BLOCK DIAGRAM
RFM01
FEATURES
Fully integrated (low BOM, easy design-in)
No alignment required in production
Fast settling, programmable, high-resolution PLL
Fast frequency hopping capability
High bit rate (up to 115.2 kbps in digital mode and 256 kbps
in analog mode)
Direct differential antenna input
Programmable baseband bandwidth (67 to 400 kHz)
Analog and digital RSSI outputs
Automatic frequency control (AFC)
Data quality detection (DQD)
Internal data filtering and clock recovery
RX pattern recognition
SPI compatible serial control interface
Clock and reset signals for microcontroller
16 bit RX data FIFO
Standalone operation mode without microcontroller
Low power duty-cycle mode (less than 0.5 mA average
supply current)
Standard 10 MHz crystal reference with in circuit calibration
Alternative OOK support
Wake-up timer
Low battery detector
2.2 to 5.4 V supply voltage
Low power consumption (~9 mA in low bands)
Low standby current (0.3 µA)
Compact 16-pin TSSOP package
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
1
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RFM01 Datasheet, Funktion
RFM01
Recommended supply decoupling capacitor values
C2 and C3 should be 0603 size ceramic capacitors to achieve the best supply decoupling. The capacitor values are valid for both stand-
alone and microcontroller mode.
Band [MHz]
315
433
868
915
C1
2.2µF
2.2µF
2.2µF
2.2µF
C2
10nF
10nF
10nF
10nF
C3
390pF
220pF
47pF
33pF
6
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RFM01 pdf, datenblatt
RFM01
2. Frequency Setting Command
Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
1 0 1 0 f11 f10 f9 f8 f7 f6 f5 f4 f3 f2 f1 f0
POR
A680h
The 12-bit parameter of the Frequency Setting Command <f11 :
f0> has the value F. The value F should be in the range of 96 and
3903. When F is out of range, the previous value is kept. The
synthesizer center frequency f0 can be calculated as:
f0 = 10 MHz * C1 * (C2 + F/4000)
3. Receiver Setting Command
The constants C1 and C2 are determined by
the selected band as:
Band [MHz]
315
433
868
915
C1 C2
1 31
1 43
2 43
3 30
bit 15 14 13 12 11 10
110000
9
0
876543210
0 d1 d0 g1 g0 r2 r1 r0 en
Bits 7-6 select the VDI (valid data indicator) signal:
POR
C0C1h
Bits 5-4 LNA gain set:
d1 d0
00
01
10
11
VDI output
Digital RSSI Out (DRSSI)
Data Quality Detector Output (DQD)
Clock recovery lock
DRSSI && DQD
g1 g0
00
01
10
11
Bits 3-1 control the threshold of the RSSI detector:
GLNA (dB relative to max. G)
0
-14
-6
-20
r2 r1 r0
000
001
010
011
100
101
110
111
RSSIsetth [dBm]
-103
-97
-91
-85
-79
-73
Reserved
Reserved
The RSSI threshold depends on the LNA gain, the real RSSI threshold can be calculated:
RSSIth = RSSIsetth + GLNA
Bit 0 (en) enables the whole receiver chain when set. Enable/disable of the wake-up timer and the low battery detector are not affected by
this setting.
Note: Clock tail is not generated when the crystal oscillator is controlled by en bit.
12
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