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PDF RMX2 Data sheet ( Hoja de datos )
| Número de pieza | RMX2 | |
| Descripción | Narrow Band Direct Interface Multi Channel Transceiver | |
| Fabricantes | Radiometrix | |
| Logotipo |  |
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NEW Radiometrix
Issue 1, 01 November 2007
Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England
Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233
Preliminary data sheet
RMX2
Narrow Band Direct Interface Multi Channel Transceiver
The RMX2 is an ETSI EN 300 220-3
compliant UHF FM narrow band
semi-duplex radio data module. It is a
high performance transceiver
designed for use in industrial
applications requiring long range,
high performance and reliability.
The operating frequencies are
available in the 433.05-434.79MHz
European ISM band and 458.5-
459.1MHz UK SRD band allocations.
Features
! +10dBm (10mW) RF power, 3.0V @ 35mA operation
! Programmable RF channel
! Fast TX/RX switching time (5ms)
! Receiver sensitivity -119dBm
! Class one receiver performance
! ETSI EN 300 220-3, EN 301 489-3 compliant
Figure 1: RMX2-433-10
RMX2 is a narrowband multichannel module with 25 kHz channel steps, but still
achieves sub-10mS TX/RX switching speed, making it an ideal RF unit for inclusion
in feedback systems.
The narrow band technique used in RMX2 enables high interference rejection and
concurrent operation with multiple modules.
Applications
Telemetry
! Water level monitor for rivers, dams, etc.
! Monitoring systems for environmental data such as temperature, humidity, etc.
! Transmission of measurement data (pressure, revolution, current, etc) to PC
! Security alarm monitoring
Telecontrol
! Industrial remote control systems
! Remote control systems for factory automation machines
Radiometrix Ltd
RMX2-433-10 Data sheet
Page 1/12
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
www.DataSheet.co.kr
up to 1200MHz
VCO
LPF
+2.8V
Reference Oscillator
21.25MHz
Fin CLK
Xf in
Data
GND
LE
D0 PS
VCC
ZC
Vp LD/f out
OSC out
P
OSC in
R
2.2kΩ
2.2kΩ
2.2kΩ
CLK
DATA
LE
2.2kΩ
LD
RMX2-XXX-10
Control pin name
Figure 4: PLL IC Control
RMX2 has an internal PLL frequency synthesizer as shown in Figure 1. Channel frequency is set by
loading data directly into the registers of the controlling IC over a simple, 3 wire serial bus (interface
pins CLK, LE, DATA). Also RMX2 has a Lock Detect (LD) terminal that shows the lock status of the
frequency. These signal lines are connected directly to the PLL IC through a 2.2kΩ resistor.
The interface voltage of RMX2 is 2.8 V, so the control voltage must be the same. RMX2 comes equipped
with a Fujitsu MB15E03SL PLL IC. Please refer to the manual of the PLL IC.
http://www.fujitsu.com/downloads/MICRO/fme/pll/e421359.pdf
The following is a supplementary description related to operation with RMX2. In this description, the
same names and terminology as in the PLL IC manual are used, so please read the manual beforehand.
How to calculate the setting values for the PLL register
The PLL IC manual shows that the PLL frequency setting value is obtained with the following
equation.
fVCO
=
[(M
× N)+
R
A]×
f OSC
N > M2
Equation 1
fvco : Output frequency of external Voltage Controlled Oscillator (VCO)
N: Preset divide ratio of binary 11-bit programmable counter (3 to 2,047)
A: Preset divide ratio of binary 7-bit swallow counter (0 ≤ A ≤ 127)
fosc: Output frequency of the reference frequency oscillator
R: Preset divide ratio of binary 14-bit programmable reference counter (3 to 16,383)
M: Preset divide ratio of the dual modulus prescaler (64 or 128)
Because of the circuitry used in the RMX2, the frequency programmed into the PLL must be 21.7MHz
below the desired channel frequency. There is no need to re-program when switching between transmit
and receive modes.
Therefore the expected value of the frequency generated at VCO (fexpect) is as below.
fvco = fexpect = (fch – 21.7MHz)
Equation 2
The PLL generates channel frequencies as multiples of a 'comparison' frequency. This phase
comparison frequency (fcomp) is made by dividing the frequency input to the PLL from the reference
oscillator by reference counter R. The RMX2 uses a 21.25 MHz TCXO for the reference clock fosc.
fcomp can be either 12.5kHz or 25 kHz.
The above equation 1 results in the following with n = M x N + A, where “n” is the number for division.
fVCO = n × f comp
Equation 3
Radiometrix Ltd
RMX2-433-10 Data sheet
Page 5/12
Datasheet pdf - http://www.DataSheet4U.net/
5 Page 
www.DataSheet.co.kr
RMX2-458-10: 458MHz UK SRD band (458.525 – 459.175 MHz)
Parameter name
Phase Comparing Frequency Fcomp
[kHz]
Start Channel Frequency Fch [MHz]
Channel Step Frequency [kHz]
Number of Channel
Prescaler M
Value
25
458.5250
25
27
64
Parameter name
Reference Frequency FOSC[MHz]
Offset Frequency Foffset [MHz]
Value
21.25
21.7
: For data input
: Result of calculation
: Fixed Vale
Parameter name
Reference Counter R
Programmable Counter N Min.
Value
Programmable Counter N Max.
Value
Swallow Counter A Min. Value
Swallow Counter A Max. Value
Value
850
273
273
1
27
CH
No.
Channel Frequency
Fch
Expect
Frequency
Fexpect
Lock
Frequency
FVCO
Number of
Division n
(MHz)
(MHz)
(MHz)
0 458.5250
436.8250 436.8250 17473
1 458.5500
436.8500 436.8500 17474
2 458.5750
436.8750 436.8750 17475
3 458.6000
436.9000 436.9000 17476
4 458.6250
436.9250 436.9250 17477
5 458.6500
436.9500 436.9500 17478
6 458.6750
436.9750 436.9750 17479
7 458.7000
437.0000 437.0000 17480
8 458.7250
437.0250 437.0250 17481
9 458.7500
437.0500 437.0500 17482
10 458.7750
437.0750 437.0750 17483
11 458.8000
437.1000 437.1000 17484
12 458.8250
437.1250 437.1250 17485
13 458.8500
437.1500 437.1500 17486
14 458.8750
437.1750 437.1750 17487
15 458.9000
437.2000
437.2000
17488
16 458.9250
437.2250
437.2250
17489
17 458.9500
437.2500
437.2500
17490
18 458.9750
437.2750
437.2750
17491
19 459.0000
437.3000
437.3000
17492
20 459.0250
437.3250
437.3250
17493
21 459.0500
437.3500
437.3500
17494
22 459.0750
437.3750
437.3750
17495
23 459.1000
437.4000
437.4000
17496
24 459.1250
437.4250
437.4250
17497
25 459.1500
437.4500
437.4500
17498
26 459.1750
437.4750
437.4750
17499
Programmable Swallow
Counter N Counter A
273 1
273 2
273 3
273 4
273 5
273 6
273 7
273 8
273 9
273 10
273 11
273 12
273 13
273 14
273 15
273 16
273 17
273 18
273 19
273 20
273 21
273 22
273 23
273 24
273 25
273 26
273 27
Note: In the 458MHz SRD band in the UK, channel frequencies 458.825MHz, 458.8375MHz and 458.900MHz are
reserved for alarm usage, and should not be used for general telemetry applications
Radiometrix Ltd
RMX2-433-10 Data sheet
Page 11/12
Datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet RMX2.PDF ] | |
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