| UHF
Narrow Band FM Low Cost multi channel radio modules |
 |
TLC2H/RLC2H
|
|
The TLC2H transmitter RLC2H receiver
offer a low power, reliable data link in an industry standard
pin out and foot print. This makes the TLC2H/RLC2H pair
ideally suited to those low power applications where existing
wideband modules have insufficient range, or where low cost
multi-channel operation is needed without compromising on
RF specification or regulatory requirement.
|
Figure 1: TLC2H-433-5/RLC2H-433-5
|
|
|
-
Conforms to
EN 300 220-3 and EN 301 489-3
-
High performance
double superhet, PLL synthesizer with TCXO
- SAW front end filter
-
Data rates up
to 5 kbps for standard module
-
Usable range
over 500m
-
Fully screened.
Low profile
-
Feature-rich
interface (RSSI, analogue and digital baseband)
-
Re-programmable
via RS232 interface
-
Low power requirements
-
Handheld terminals
-
EPOS equipment,
barcode scanners
-
Data loggers
-
Industrial telemetry
and telecommand
-
In-building
environmental monitoring and control
-
High-end security
and fire alarms
-
DGPS systems
-
Vehicle data
up/download
- Heavy vehicle/machinery controls
Technical Summary
- Operating frequency: 433.875-434.650MHz
- Any custom frequency on 433 - 435MHz
- 32 channels
- Transmit power: 10dBm (10mW)
- Supply range: 3.1 - 15V Transmit and
3.7 - 15V Receive
- Current consumption: 34mA (transmit),
18mA (receive)
- Data bit rate: 5kbps max. (standard
module)
- Receiver sensitivity -120dBm (for
12dB SINAD)
- Serial configuration by inverted RS232
at 3V CMOS level
|
| Evaluation
Platform: Narrow
Band Evaluation Kit |
| |
|
 |
| |
Figure 2: TLC2H block diagram |
| |
|
Figure 3: TLC2H Footprint
(Top view)
|
| |
| Pin Description - TLC2H |
|
Pin
|
Name
|
Function
|
|
1
|
Vcc |
DC supply (3.1 - 15V at 34mA) |
|
2
|
No pin |
Not present |
|
3
|
TXD (MOD NC) |
DC coupled input for CMOS
logic. Rin = 47kW |
|
4
|
No pin |
Not present |
|
5
|
0V |
Ground |
| P0/PGM |
parallel channel select pins
|
Channel select LSB bit 0;
Serial frequency programming |
| P1 |
Channel select bit 1, True
logic (0V = low). Weak pullup to 3V |
| P2 |
Channel select bit 2, True
logic (0V = low). Weak pullup to 3V |
| P3 |
Channel select MSB bit 3,
True logic (0V = low). Weak pullup to 3V |
| Jumper P4 |
Jumper inserted, P4=0 (Channel 00 - Channel
15 at 50kHz step)
Jumper clear, P4=1 (Channel 16 - Channel 31 at 50kHs step) |
| |
|
NOTES:
1. Serial programming is by an inverted, CMOS logic level,
2400 baud RS232 datastream applied to the P0 pin.
2 Parallel channel select is by 4 pin parallel input (LSB
selected by a 2mm header, accessed through a hole in the
can)
3. Channel select inputs have pullups (10K) to 3V internal
rail. Do not exceed 3v logic levels on this port.
4. Transmitter will shutdown if Vcc falls below about 2.9v
5. TXD: logic low < 1.3v, logic high > 1.7v. TXD maximum
voltage = 10v
|
|
| |
|
Figure 4: RLC2H block diagram |
| |
Figure 5: RLC2H Footprint
(Top view)
|
| |
| Pin Description - RLC2H |
|
Pin
|
Name
|
Function
|
| 1 |
Vcc |
DC supply (3.7V to 15V, at
18mA). |
| 2 |
RSSI |
0.5V-2.5V DC; 60dB dynamic
range; 40kW output impedance |
| 3 |
0V |
Ground |
| 4 |
RXD |
Open collector digital data
output, no pullup |
| 5 |
AF out |
700mV pk-pk audio. DC coupled,
approximately 0.8VDC bias |
| P0/PGM |
parallel channel select pins
|
Channel select LSB bit 0; Serial frequency
programming |
| P1 |
Channel select bit 1, True
logic (0V = low), Weak pullup to 3.5V |
| P2 |
Channel select bit 2, True
logic (0V = low), Weak pullup to 3.5V |
| P3 |
Channel select MSB bit 3,
True logic (0V = low), Weak pullup to 3.5V |
| Jumper P4 |
Jumper inserted, P4=0 (Channel 00 - Channel
15 at 50kHz step)
Jumper clear, P4=1 (Channel 16 - Channel 31 at 50kHz step) |
|
|
|
NOTES:
1. Data recovery circuit used for RXD is not
a simple 'average and compare' type. It is a peak sampling quasi-DC
coupled design, allowing a greater than usual flexibility in data
format.
Maximum time between data transitions: 250ms
2. Serial programming is by a 2400 baud inverted 'RS232' (3V CMOS
levels) datastream applied to the P0 pin. If connection to a true
RS232 port is desired, then a suitable inverting level shifter
/ buffer (MAX232 or NPN switch transistor) is needed.
3. Parallel channel select is by a 4 pin parallel input (MSB selected
by a 2mm header, accessed through a hole in the can). 3V CMOS
levels should be used.
4. As supplied the frequency table is thus:
ch 0-15 433.875 - 434.625 MHz (50KHz steps)
ch 16-31 433.9 - 434.65 MHz (50KHz steps)
|
| |
|
Serial interface commands
|
| TLC2H/RLC2H frequency/channel
can be serially configured using HyperTerminal or any other terminal
program configured with following setup: |
| |
| 2400 baud RS232, 8
bit data, no parity, 1 start bit, 1 or 2 stop bits. No flow control |
| Serial data is sent
to the unit on one of the parallel channel select pins (P0). It
is very important that the unit does not 'decode' switch bounce
in ordinary operation as a command string, or spurious re-writing
of the e2prom will result. For this reason the user must send the
16 character string ENABLESERIALMODE to fully enable the serial
command mode before sending any of the command strings listed below.
Command mode is disabled on power down, or on reception of a # character. |
| |
| GOCHAN aa |
Serial select
of channel aa (0 to 31) |
| LOAD aa nnnnn |
Set value of N register for
channel aa, where aa is Channels 0 to 31 |
| RVALUE rrrr |
Set value for R register |
| SETPAR |
Channel selected
by 5 bit parallel inputs (4pins + jumper) |
| SETSER |
Channel selected by most recent
'GOCHAN' operation |
| SINGLE nnnnn |
Set value of N
for single channel operation.
N value NOT stored in EEPROM |
| |
|
| <cr> |
Process entry |
| / |
Clear all buffers |
| # |
Disable command mode |
aa = a two digit channel number from 00 to
31
nnnnn = a synthesizer N register value, (up to 65535)
rrrr = the synthesizer R register value, (up to 16383)
|
|
 |
 |
So R = 520 |
 |
| |
|
Notes:
A pause of at least 25ms must be allowed between command strings
(EEPROM programming time).
SINGLE mode does not store the N value in EEPROM. Therefore the
unit is inoperative after a power down until either another valid
SINGLE command is received, or mode is changed by a GOCHAN, SETPAR
or SETSER command. SINGLE mode is intended for frequency agile
applications.
|
|
| |
| TLC2H,
RLC2H channels are spaced at 50kHz interval into two frequency groups.
50kHz spacing between sequential channels minimises adjacent channel
interference. S4 jumper determines which frequency group is selected. |
| |
|
Channel 0-15
Jumper (P4) Inserted
|
Frequency (MHz)
|
Channel 16-31
Jumper (P4) clear
|
Frequency (MHz)
|
|
0
|
433.875 |
|
|
| |
|
16
|
433.900 |
|
1
|
433.925 |
|
|
| |
|
17
|
433.950 |
|
2
|
433.975 |
|
|
| |
|
18
|
434.000 |
|
3
|
434.025 |
|
|
| |
|
19
|
434.050 |
|
4
|
434.075 |
|
|
| |
|
20
|
434.100 |
|
5
|
434.125 |
|
|
| |
|
21
|
434.150 |
|
6
|
434.175 |
|
|
| |
|
22
|
434.200 |
|
7
|
434.225 |
|
|
| |
|
23
|
434.250 |
|
8
|
434.275 |
|
|
| |
|
24
|
434.300 |
|
9
|
434.325 |
|
|
| |
|
25
|
434.350 |
|
10
|
434.375 |
|
|
| |
|
26
|
434.400 |
|
11
|
434.425 |
|
|
| |
|
27
|
434.450 |
|
12
|
434.475 |
|
|
| |
|
28
|
434.500 |
|
13
|
434.525 |
|
|
| |
|
29
|
434.550 |
|
14
|
434.575 |
|
|
| |
|
30
|
434.600 |
|
15
|
434.625 |
|
|
| |
|
31
|
434.650 |
|
|
| |
Condensed specifications
| Frequency |
433.875 - 434.675MHz
(32 channels)
Custom variants on 433-435MHz |
|
Frequency
stability
|
+/- 1.5kHz |
|
Channel
spacing
|
25kHz (12.5kHz by special
order) |
|
Number
of channels
|
32 channels controlled via RS232 interface
or 2 x 16 groups by parallel port
|
| |
|
| Operating temperature |
-10 to +60 °C (Storage
-30 to +70 °C) |
| Spurious radiations |
Compliant with ETSI EN 300
220-3 and EN 301 489-3 |
| Intended approval |
ETSI EN 300 220-3 (radio)
and EN 301 489-3 (EMC) |
| |
|
| Transmitter
|
|
| Supply |
|
| Voltage |
3.1V - 15V |
| Current |
34mA nominal |
| Output power |
10mW +/- 1dB
(1mW or 5mW by special order) |
| TX on switching
time |
50ms from power
up |
| Peak FM deviation |
+/-3kHz |
| Modulation type |
FSK (F3D) |
| TX modulation
bandwidth |
DC - 5kHz (3V
CMOS compatible) |
| Adjacent channel TX power |
-37dBm |
| TX spurious |
<-45dBm (<-60dBm in
standby) |
| Inputs |
analogue, data (CMOS/TTL
compatible) |
| Size |
37x27x8mm |
| Interface user |
3pin 0.2" pitch molex |
Channel
|
4pin 0.1"
pitch molex |
|
RF |
2pin 3mm pitch |
| Recommended
PCB hole size |
1.2mm |
| |
|
| Receiver |
|
| Sensitivity |
-120dBm for
12 dB SINAD |
| image/spurii |
-60dB |
| blocking |
-85dB |
| LO re-radiation |
<-60dBm |
| adj. Channel |
<-60dB |
| Supply |
|
| Voltage |
3.7V - 15V |
| Current |
18mA |
| outputs |
RSSI, audio,
digital data (quasi DC data recovery circuit) |
| Size |
50 x 30 x 10
mm |
| Interface user |
5pin 0.1" pitch molex |
Channel
|
4pin 0.1" pitch molex |
|
RF |
2pin 0.1" pitch molex |
| |
|
| Recommended
PCB hole size |
1.2mm |
| Power on to
valid AF |
28ms |
| Power on to
stable RXD (50:50 mark / space) |
50ms |
| |
|
| Notes: |
When
RX is on and a transmitter keys up, again a 50ms period
is required to stabilise data output mark/space. i.e. allow
at least 50ms of preamble |
| |
|
|
| |
|
RX Received Signal Strength Indicator (RSSI)
The RLC2H has wide range RSSI which measures the strength of
an incoming signal over a range of 60dB or more. This allows assessment
of link quality and available margin and is useful when performing
range tests.
The output on pin 2 of the module has a standing DC bias of up
to 0.4V with no signal, rising to 2.5V at maximum indication (RF
input levels of -40dBm and above). DVmin-max
is typically 2V and is largely independent of standing bias variations.
Output impedance is 40kW. Pin 2 can
drive a 100mA meter directly, for simple
monitoring.
Typical RSSI characteristic is as shown below:
Figure
6: RSSI level with respect to received RF level at RLC2H antenna
pin
|
| |
|
|
| |
| Antenna
requirements
Three types of integral antenna are recommended
and approved for use with the module:
A) Whip: This
is a wire, rod, PCB track or combination connected directly to
RF pin of the module. Optimum total length is 16cm (1/4 wave @
433MHz). Keep the open circuit (hot) end well away from metal
components to prevent serious de-tuning. Whips are ground plane
sensitive and will benefit from internal 1/4 wave earthed radial(s)
if the product is small and plastic cased
B) Helical:
Wire coil, connected directly to RF pin, open circuit at other
end. This antenna is very efficient given it's small size (20mm
x 4mm dia.). The helical is a high Q antenna, trim the wire length
or expand the coil for optimum results. The helical de-tunes badly
with proximity to other conductive objects.
C) Loop:
A loop of PCB track tuned by a fixed or variable capacitor to
ground at the 'hot' end and fed from RF pin at a point 20% from
the ground end. Loops have high immunity to proximity de-tuning.
|
| |
A
|
B
|
C
|
| |
Whip
|
Helical
|
Loop
|
| Ultimate performance |
***
|
**
|
*
|
| Easy of design set-up |
***
|
**
|
*
|
| Size |
*
|
***
|
**
|
| Immunity proximity effects |
*
|
**
|
***
|
| Range open ground to similar
antenna |
500
|
200
|
100
|
|
| |
| The antenna
choice and position directly controls the system range. Keep it
clear of other metal in the system, particularly the 'hot' end.
The best position by far, is sticking out the top of the product.
This is often not desirable for practical/ergonomic reasons thus
a compromise may need to be reached. If an internal antenna must
be used, try to keep it away from other metal components, particularly
large ones like transformers, batteries and PCB tracks/earth plane.
The space around the antenna is as important as the antenna itself. |
|
Figure 7: Antenna types |
|
| Ordering
Information |
| Part
No. |
Description |
Frequency
band (MHz) |
| TLC2H-433-5 |
UHF multi channel narrow band
FM transmitter |
433.875-434.650MHz |
| RLC2H-433-5 |
UHF multi channel narrow band
FM receiver |
433.875-434.650MHz |
| |
|
|
|
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:
Licensing
policy manual
|
|
