Data Sheet(pdf)

Hartcran House, 231 Kenton Lane, Harrow, Middlesex, HA3 8RP, England
Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233, www.radiometrix.com
Issue 1, 31 July 2012
RMX2
NBFM Direct Interface Multi Channel Transceiver
The RMX2 is an ETSI EN 300 220-3
compliant UHF FM narrow band semiduplex 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 315MHz, 433.05-434.79MHz European
ISM band and 458.5-459.1MHz UK SRD
band allocations.
Figure 1: RMX2-433-10
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
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
Evaluation platforms: NBEK + RMX carrier
Radiometrix Ltd
RMX2 Data sheet
Page 1/12
Figure 2: RMX2 block diagram
Radiometrix Ltd
RMX2 Data sheet
Page 2/12
12
3
50
5.1
9
30
RXM2-433-10
UHF Multi Channel
Narrow Band Transc eiver
0.7
22.5
18
2.5
1
2.5
CLK
DATA
LE
LD
RSSI
D0
D1
22.5
18
2.5
7.13
12.7
15.24
2.54
9.67
2.54
7.13
Reference hole position for PCB mounting (bottom view)
recommended PCB hole size: 1.2 mm
pin pitch: 2.54 mm
module footprint size: 30 x 50 mm
Figure 3: Pinouts and dimensions
Radiometrix Ltd
RMX2 Data sheet
Page 3/12
Condensed specifications
All ratings at 25°c unless otherwise noted
Parameter
Rating
General characteristics
Operating frequency range
Channel step
Frequency stability
Data rate
PLL reference frequency
Operating voltage range
Supply Current
Operating temperature range
Dimensions
Transmitter section
RF output power
Deviation (Digital In)
Deviation frequency
characteristics
TX S/N
Spurious emission
Adjacent channel leakage power
Total distortion and noise
Switching time RX to TX
Lock time
Conditions
315 - 315.375 MHz
433.05 - 434.775 MHz
458.5 - 459.1MHz
Programmable (PLL IC:
Fujitsu MB15E03SL)
±3ppm
9600 bps max
21.25 MHz
3 – 15 V
35mA (TX)
24mA (RX)
- 20 to + 70 °C
30 x 50 x 9 mm
At 434.0MHz / 458.7MHz, Antenna impedance 50Ω
PN9, 9600 bps, LPF 20 kHz
DC to 4800Hz
-30dB
<-54dBm
<-40dBm
-37dBm
30dB
5 - 10ms
30 – 40ms
10 – 20ms
1kHz, Deviation = ±2.4kHz CCITT filter
<1GHz, non-harmonic spurii
2nd and 3rd harmonics
CH 25kHz, BW = 16kHz, PN9, 9600 bps
1kHz, Deviation = ±2.4kHz, CCITT filter
*1
RX TX
*2
Free Run TX
*3
25kHz channel shift
-119dBm (AF OUT)
35dB
Distortion
5%
All spurious responses
Better than 60dB
Better than 50dB
65dB
Blocking
Switching time TX to RX
Lock Time
-20 to +70 °C
Input data pulse width: Min 104µs, Max 5ms
10mW ±1dB
2.4kHz ±0.3kHz
± 3dB
Receiver section
Receiver Sensitivity
Receiver S/N
Intermodulation
Adjacent channel selectivity
European ISM band (RMX2-433-10)
UK SRD allocation (RMX2-458-10)
>84dBm
5 - 10 ms
30 - 40 ms
10 - 20 ms
1kHz, Deviation ±2.4kHz, CCITT filter
1kHz, Deviation ±2.4 kHz, CCITT filter,
RF level = -30dBm
1kHz, Deviation ±2.4kHz, CCITT filter, RF level=30dBm
2 signal method, Jamming signal = FM
2 signal method
2 signal method, ± 25kHz
Jamming signal = FM
± 1, 2, 5, 10 MHz
*1
TX RX
*2
Free Run RX
*3
25kHz channel shift
NOTES:
1.
2.
3.
Time until TX frequency or 1st Local frequency reach a steady frequency ±1.5ppm
Time until TX frequency or 1st Local frequency reach a steady frequency ±1.5ppm after PLL setting data is set.
Time until TX frequency or 1st Local frequency reach a steady frequency ±1.5ppm after setting PLL setting data
to change the frequency for 25kHz
Radiometrix Ltd
RMX2 Data sheet
Page 4/12
up to 1200MHz
2.2kΩ
VCO
LPF
+2.8V
Fin
CLK
Xf in
Data
GND
LE
D0
PS
VCC
ZC
Vp
Reference Oscillator
LD/f out
OSC out
P
OSC in
R
CLK
2.2kΩ
DATA
2.2kΩ
2.2kΩ
LE
LD
RMX2-XXX-10
Control pin name
21.25MHz
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.
f VCO =
fvco :
N:
A:
fosc:
R:
M:
[(M × N ) + A]× f OSC
R
2
N>M
Equation 1
Output frequency of external Voltage Controlled Oscillator (VCO)
Preset divide ratio of binary 11-bit programmable counter (3 to 2,047)
Preset divide ratio of binary 7-bit swallow counter (0 ≤ A ≤ 127)
Output frequency of the reference frequency oscillator
Preset divide ratio of binary 14-bit programmable reference counter (3 to 16,383)
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.
f VCO = n × f comp
Equation 3
Radiometrix Ltd
RMX2 Data sheet
Page 5/12
n=
f VCO
f comp
note:
f comp =
f OSC
R
Equation 4
Also, this PLL IC operates with the following R, N, A and M relational expressions.
R=
f OSC
f comp
 n 
N = INT  
M 
A = n − (M × N )
Equation 5
INT: Integer portion of a division
Equation 6
Equation 7
As an example, the setting value of RF channel frequency fch 434.6750MHz can be calculated as below.
Conditions:
Constant:
Constant:
Channel center frequency:
Offset frequency:
Reference frequency:
fch = 434.6750MHz
foffset=21.7 MHz
fosc=21.25 MHz
Set 25 kHz for Phase Comparison Frequency fcomp and 64 for Prescaler value M
The frequency of VCO will be:
fvco = fexpect = fch – foffset = 434.675 –21.7 = 412.975MHz
Dividing value “n” is derived from Equation 4
n = fvco / fcomp = 412.975MHz/25kHz = 16519
Value “R” of the Reference Counter is derived from Equation 5.
R = fosc/fcomp = 21.25MHz/25kHz = 850
Value “N” of the programmable counter is derived from Equation 6.
N = INT (n/M) = INT(16519/64) = 258
Value “A“ of the swallow counter is derived from Equation 7.
A = n – (M x N) = 16519 – 64 x 258 = 7
The frequency of RMX2 is locked at a centre frequency fch by inputting the PLL setting values N, A and R
obtained with the above equations as serial data. The above calculations are the same for the other
frequencies.
Method of serial data input to the PLL
After the RF channel table plan is decided, the data needs to be allocated to the ROM table and read from
there or calculated with the software.
Together with this setting data, operation bits that decide operation of the PLL must be sent to the PLL. The
operation bits for setting the PLL are as follows. These values are placed at the head of the reference
counter value and are sent to the PLL.
CS: Charge pump current select bit
CS = 0
±1.5 mA select VCO is optimised to ±1.5 mA
LDS: LD/fout output setting bit
LDS = 0
LD select
Hardware is set to LD output
FC: Phase control bit for the phase comparator
FC = 1
Hardware operates at this phase
Radiometrix Ltd
RMX2 Data sheet
Page 6/12
2nd Data
st
1 Data
2nd Data
st
1 Data
N11
N10
N9
N8
N7
N6
A1
CNT= 0
CS
LDS
FC
SW
R14
R13
R1
CNT= 1
Invalid data
∫∫
MSB
DATA
∫∫
CLK
LSB
∫∫
11
12
13
16
10
LE
∫∫
14
RMX2
# : t0,t5 > = 100 ns t1,t2,t6 > = 20 ns t3,t4 > = 30 ns
Terminal name
# : Keep the LE terminal at a low level, w hen write the data to the shift resister.
Figure 5: PLL IC programming timing diagram
15
The PLL IC, which operates as shown in the block diagram in the manual, shifts the data to the 19-bit shift
register and then transfers it to the respective latch (counter, register) by judging the CNT control bit value
input at the end.
CLK [Clock]:
LE [Load Enable]:
Data [Serial Data]:
Data is shifted into the shift register on the rising edge of this clock.
Data in the 19-bit shift register is transferred to respective latches on the rising edge
of the clock. The data is transferred to a latch according to the control bit CNT value.
You can perform either reference counter setup or programmable counter setup
first.
TIMING CHART
Control timing in a typical application is shown in Figure 3.
Initialisation of the radio is performed following power-up and successful reset of the controlling CPU. The
FET switches controlling the radio module systems (controlled by RXSEL and TXSEL) must be set to
inactive (pin high or floating) to avoid unwanted emissions.
The power supply to the radio module is then turned on. When the radio module is first powered, the PLL
internal registers are not yet set to meaningful values, and the VCO circuit will be unstable.
Data transmission and reception is only possible 40 ms after the first set up data is sent to the PLL.
Subsequent ‘channel change’ re-programming only takes 20 ms before data can be handled.
Changing channels must be carried out in the receive mode. If switching is performed in transmission mode,
unwanted interference will be generated.
If the module is switched to the receive mode when operating in the same channel, (a new PLL setting is not
*1
necessary) it can receive data within 5 ms of switching . For data transmission, if the RF channel to be used
for transmission is set while still in receiving mode, data can be sent at 5 ms after the radio module is
*2
switched from reception to transmission .
Check that the Lock Detect signal is “high” 20 ms after the channel is changed. In some cases the Lock
Detect signal becomes unstable before the lock is correctly detected, so it is necessary to note if processing
of the signal is interrupted.
*1:
*2:
DC offset may occur due to frequency drift caused by ambient temperature change. Customers are
urged to verify operation at low temperature and nitiali their timing.
Sending ‘10101…..’ preamble just after switching to transmission mode enables smoother operation
of the data extraction circuit used by the receiver.
For 9600 bps, a preamble of ‘11001100’ is effective.
Recommended preamble length:
-10 °C -+55°C: 7 ms
-20 °C - +65 °C (for operation exceeding the above range): 15 ms
Radiometrix Ltd
RMX2 Data sheet
Page 7/12
Norm al status
States immediately after power c omes on
No c hannel c hange
CPJ
Power on
RMX2
Power on
#3
RX SELECT
CPU control
CH change &
Data rec overy
Timing
#1
#2
#4
CH
#4
Data # 5
#4
5m s
Data # 6
CH
Data # 7
CH
LO
TX SELECT
Data transmit
5m s
5m s
5m s
Figure 6: Timing diagram for RMX2
#:1 Reset control CPU
#:2 Initialize the port connected to the module.
#:3 Supply pow er to the module after
nitialising CPU.
#:5 40 ms later, the receiver can receive the data after changing
the channel..
#:6 10 to 20 ms later, the receiver can receive the data after
changing the channel.
#:7 5 ms later, the data can be received if the RF channel is not
changed.
#:4 Rfchannel change must be performed in receiving mode.
Radiometrix Ltd
RMX2 Data sheet
Page 8/12
PLL frequency setting data reference
RMX2-433-10: 433MHz European ISM band (433.050 – 434.790 MHz)
Parameter name
Phase Comparing Frequency
Fcomp [kHz]
Start Channel Frequency Fch
[MHz]
Channel Step Frequency [kHz]
Number of Channel
Prescaler M
: For data input
: Result of calculation
: Fixed Vale
Value
25
433.0750
25
69
64
Parameter name
Value
Reference Frequency FOSC[MHz] 21.25
Offset Frequency Foffset [MHz]
21.7
CH.
No.
Channel
Frequency
Fch
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
Radiometrix Ltd
(MHz)
433.0750
433.1000
433.1250
433.1500
433.1750
433.2000
433.2250
433.2500
433.2750
433.3000
433.3250
433.3500
433.3750
433.4000
433.4250
433.4500
433.4750
433.5000
433.5250
433.5500
433.5750
433.6000
433.6250
433.6500
433.6750
433.7000
433.7250
433.7500
433.7750
433.8000
433.8250
433.8500
433.8750
Expect
Frequenc
y
Fexpect
(MHz)
411.3750
411.4000
411.4250
411.4500
411.4750
411.5000
411.5250
411.5500
411.5750
411.6000
411.6250
411.6500
411.6750
411.7000
411.7250
411.7500
411.7750
411.8000
411.8250
411.8500
411.8750
411.9000
411.9250
411.9500
411.9750
412.0000
412.0250
412.0500
412.0750
412.1000
412.1250
412.1500
412.1750
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
257
258
0
63
Lock
Frequenc
y FVCO
Number of
Division n
Programmable
Counter N
Swallow
Counter
A
(MHz)
411.3750
411.4000
411.4250
411.4500
411.4750
411.5000
411.5250
411.5500
411.5750
411.6000
411.6250
411.6500
411.6750
411.7000
411.7250
411.7500
411.7750
411.8000
411.8250
411.8500
411.8750
411.9000
411.9250
411.9500
411.9750
412.0000
412.0250
412.0500
412.0750
412.1000
412.1250
412.1500
412.1750
16455
16456
16457
16458
16459
16460
16461
16462
16463
16464
16465
16466
16467
16468
16469
16470
16471
16472
16473
16474
16475
16476
16477
16478
16479
16480
16481
16482
16483
16484
16485
16486
16487
257
257
257
257
257
257
257
257
257
257
257
257
257
257
257
257
257
257
257
257
257
257
257
257
257
257
257
257
257
257
257
257
257
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
RMX2 Data sheet
Page 9/12
33
34
35
6
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
Radiometrix Ltd
433.9000
433.9250
433.9500
433.9750
434.0000
434.0250
434.0500
434.0750
434.1000
434.1250
434.1500
434.1750
434.2000
434.2250
434.2500
434.2750
434.3000
434.3250
434.3500
434.3750
434.4000
434.4250
434.4500
434.4750
434.5000
434.5250
434.5500
434.5750
434.6000
434.6250
434.6500
434.6750
434.7000
434.7250
434.7500
434.7750
412.2000
412.2250
412.2500
412.2750
412.3000
412.3250
412.3500
412.3750
412.4000
412.4250
412.4500
412.4750
412.5000
412.5250
412.5500
412.5750
412.6000
412.6250
412.6500
412.6750
412.7000
412.7250
412.7500
412.7750
412.8000
412.8250
412.8500
412.8750
412.9000
412.9250
412.9500
412.9750
413.0000
413.0250
413.0500
413.0750
412.2000
412.2250
412.2500
412.2750
412.3000
412.3250
412.3500
412.3750
412.4000
412.4250
412.4500
412.4750
412.5000
412.5250
412.5500
412.5750
412.6000
412.6250
412.6500
412.6750
412.7000
412.7250
412.7500
412.7750
412.8000
412.8250
412.8500
412.8750
412.9000
412.9250
412.9500
412.9750
413.0000
413.0250
413.0500
413.0750
16488
16489
16490
16491
16492
16493
16494
16495
16496
16497
16498
16499
16500
16501
16502
16503
16504
16505
16506
16507
16508
16509
16510
16511
16512
16513
16514
16515
16516
16517
16518
16519
16520
16521
16522
16523
RMX2 Data sheet
257
257
257
257
257
257
257
257
257
257
257
257
257
257
257
257
257
257
257
257
257
257
257
257
258
258
258
258
258
258
258
258
258
258
258
258
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
0
1
2
3
4
5
6
7
8
9
10
11
Page 10/12
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
: For data input
: Result of calculation
: Fixed Vale
Value
25
458.5250
25
27
64
Parameter name
Value
Reference Frequency FOSC[MHz] 21.25
Offset Frequency Foffset [MHz]
21.7
CH
No.
Channel
Frequency
Fch
(MHz)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
Note:
458.5250
458.5500
458.5750
458.6000
458.6250
458.6500
458.6750
458.7000
458.7250
458.7500
458.7750
458.8000
458.8250
458.8500
458.8750
458.9000
458.9250
458.9500
458.9750
459.0000
459.0250
459.0500
459.0750
459.1000
459.1250
459.1500
459.1750
Expect
Frequenc
y
Fexpect
(MHz)
436.8250
436.8500
436.8750
436.9000
436.9250
436.9500
436.9750
437.0000
437.0250
437.0500
437.0750
437.1000
437.1250
437.1500
437.1750
437.2000
437.2250
437.2500
437.2750
437.3000
437.3250
437.3500
437.3750
437.4000
437.4250
437.4500
437.4750
Lock
Frequenc
y FVCO
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
Number of
Division n
Programmable
Counter N
Value
850
273
273
1
27
Swallow
Counter
A
(MHz)
436.8250
436.8500
436.8750
436.9000
436.9250
436.9500
436.9750
437.0000
437.0250
437.0500
437.0750
437.1000
437.1250
437.1500
437.1750
437.2000
437.2250
437.2500
437.2750
437.3000
437.3250
437.3500
437.3750
437.4000
437.4250
437.4500
437.4750
17473
17474
17475
17476
17477
17478
17479
17480
17481
17482
17483
17484
17485
17486
17487
17488
17489
17490
17491
17492
17493
17494
17495
17496
17497
17498
17499
273
273
273
273
273
273
273
273
273
273
273
273
273
273
273
273
273
273
273
273
273
273
273
273
273
273
273
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
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 Data sheet
Page 11/12
Radiometrix Ltd
Hartcran House
231 Kenton Lane
Harrow, Middlesex
HA3 8RP
ENGLAND
Tel: +44 (0) 20 8909 9595
Fax: +44 (0) 20 8909 2233
[email protected]
www.radiometrix.com
Copyright notice
This product data sheet is the original work and copyrighted property of Radiometrix Ltd. Reproduction in
whole or in part must give clear acknowledgement to the copyright owner.
Limitation of liability
The information furnished by Radiometrix Ltd is believed to be accurate and reliable. Radiometrix Ltd
reserves the right to make changes or improvements in the design, specification or manufacture of its
subassembly products without notice. Radiometrix Ltd does not assume any liability arising from the
application or use of any product or circuit described herein, nor for any infringements of patents or other
rights of third parties which may result from the use of its products. This data sheet neither states nor
implies warranty of any kind, including fitness for any particular application. These radio devices may be
subject to radio interference and may not function as intended if interference is present. We do NOT
recommend their use for life critical applications.
The Intrastat commodity code for all our modules is: 8542 6000
R&TTE Directive
After 7 April 2001 the manufacturer can only place finished product on the market under the provisions of
the R&TTE Directive. Equipment within the scope of the R&TTE Directive may demonstrate compliance
to the essential requirements specified in Article 3 of the Directive, as appropriate to the particular
equipment.
Further details are available on The Office of Communications (Ofcom) web site:
http://www.ofcom.org.uk/
Information Requests
Ofcom
Riverside House
2a Southwark Bridge Road
London SE1 9HA
Tel: +44 (0)300 123 3333 or 020 7981 3040
Fax: +44 (0)20 7981 3333
[email protected]
European Communications Office (ECO)
Peblingehus
Nansensgade 19
DK 1366 Copenhagen
Tel. +45 33896300
Fax +45 33896330
[email protected]
www.ero.dk
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