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radiometrix ltd lmt2/lmr2 data sheet page 1 features conforms to en 300 220-3 and en 301 489-3 high performance double superhet. pll synthesizer w ith tcxo quasi-dc (peak sampling) data recovery circuit (for enhanced performance on unbalanced datastreams) saw front-end filter data rates up to 5 kbps for standard module usable range over 1km fully screened. low profile feature-rich interface (rssi, analogue and digital baseband) re-programmable via rs232 interface low power requirements applications 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 (eu band) 458.525 - 459.1mh z (uk band) other custom uhf bands 32 channels transmit power: +10dbm (10mw) / +20dbm (100mw) supply range: 3.1 ? 15v (tx @ 10mw and rx), 4.1 ? 1 5v (tx @ 100mw) current consumption: 34ma @ 10mw, 90ma @ 100mw (tra nsmit) and 20ma (receive) data bit rate: 5kbps max. (standard module) receiver sensitivity: -118dbm (for 12 db sinad) serial configuration by inverted rs232 at 3v cmos l evel evaluation platforms : nbek + lm series carrier the lmt2 transmitter and lmr2 receiver modules offer a multi channel, low power, and reliable data link. this makes the lmt2/lmr2 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: lmt2 transmitter and lmr2 receiver uhf narrow band fm low cost multi channel hartcran house, 231 kenton lane, harrow, middlesex, ha3 8rp, england tel: +44 (0) 20 8909 9595, fax: +44 (0) 20 8909 223 3, www.radiometrix.com issue 1, 21 january 2013 lmt2 / lmr2
radiometrix ltd lmt2/lmr2 data sheet page 2 figure 2: lmt2 block diagram
radiometrix ltd lmt2/lmr2 data sheet page 3 figure 3: lmt2 footpint (top view) pin description ? lmt2 pin name function 1a vcc 3.1 ? 15v power supply (@ 10mw) 4.1 ? 15v power supply (@ 100mw) 2a 0v ground 3a txe transmit enable (active low) 4a txd dc coupled input for 3v cmos logic. r in =47k 5a no pin not present in lmt2 1b p0/pgm parallel channel select lsb serial frequency programming / configuration 1 2b p1 parallel channel select 3b p2 parallel channel select 4b p3 parallel channel select msb 5b no pin not present in lmt2 notes: 1. serial programming is by an inverted, cmos logic level, 2400 baud rs232 datastream applied to the p0 pin. 2. channel select inputs have pullups (50k ) to 3v internal rail. do not exceed 3v logic level s on this port. 3. channel select inputs are active low 4. txe has a 100k pullup to vcc 5. all pins are on an 0.1" grid 6. the pins 5a/b are not present, but are included in footprint for compatibility with other units in this family 7. in the 'off' state a pin switch open circuits th e rf output pin. there are no 'off' state spuri. 8. 10mw unit will operate (with marginally reduced specifications and lower (6-8mw) output power) from a 3.0v rail. this must be well regulated and w ithout noise or ripple, as in this state the unit's internal regulator no longer operates, and provides no supply rejection. 9. 100mw versions should not be run continuously fr om supply voltages > 9v
radiometrix ltd lmt2/lmr2 data sheet page 4 figure 4: lmr2 block diagram
radiometrix ltd lmt2/lmr2 data sheet page 5 figure 5: lmr2 footpint (top view) pin description ? lmr2 pin name function 1a vcc 3.1 ? 15v power supply 2a 0v ground 3a rxe receiver enable (active high) 4a rxd data out (open collector, no pullup) 5a af out 700mv p-p audio. dc coupled, approx 0.8v bias.` 1b p0/pgm parallel channel select lsb serial frequency programming / configuration 1 2b p1 parallel channel select 3b p2 parallel channel select 4b p3 parallel channel select msb 5b rssi dc level between 0.5v and 2.2v. 60db dynam ic range notes: 1. serial programming is by an inverted, cmos logic level, 2400 baud rs232 datastream applied to the p0 pin. 2. channel select inputs have pullups (50k ) to 3v internal rail. do not exceed 3v logic level s on this port. 3. channel select inputs are active low 4. all pins are on an 0.1" grid 5. 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 us ual flexibility in data format. 6. unit will operate (with marginally reduced specific ations) from a 3.0v rail. this must be well regulat ed and without noise or ripple, as in this state the u nit's internal regulator no longer operates, and provides no supply rejection.
radiometrix ltd lmt2/lmr2 data sheet page 6 serial interface commands 2400 baud rs232. 8 bit data, no parity, 1 start bi t, 1 or 2 stop bits. serial data is sent to the unit on one of the paral lel channel select pins (p0). it is very important that the unit does not 'decode' switch bounce in ordinary operati on as a command string, or spurious re-writing of t he e2prom will result. for this reason the user must s end the 16 character string enableserialmode (followed by a carriage return) to activate the ser ial command mode before sending any of the command strings listed below. command mode is disabled on p ower down, or on reception of a # character. to successfully program the unit, it must be enabled ( 'rxe high (rx) or txe low (tx)). gochan aa serially select channel aa, where aa is ch0 to ch31 load aa nnnnn set value of n register for channe l aa, where aa is channels 0 to 31 setpar channel selected by 4 bit parallel inputs (c h0 to ch15 only) setser channel selected by most recent gochan opera tion rvalue rrrr set value for r register single nnnnn set value of n for single channel oper ation. n value not stored in eeprom process entry / clear all buffers # disable command mode aa = a two digit channel number from 00 to 31 nnnnn = synthesizer n register value (up to 65535) rrrr = synthesizer r register value (up to 16383) 17356 25 900 . 433 = = = khz mhz f f n cing channelspa rf tx khz mhz f f r cing channelspa tcxo 25 13 = = , so r=520 16500 25 4. 21 900 . 433 4. 21 = ? = ? = khz mhz f mhz f n cing channelspa rf rx note : a pause of at least 50ms must be allowed between co mmand strings (eeprom programming time). single mode does not store the n value in eeprom. t herefore the unit is inoperative after a power down until either another valid single comm and is received, or mode is changed by a gochan, setpar or setser command. single mode is intended for frequency agile applications.
radiometrix ltd lmt2/lmr2 data sheet page 7 lmt2, lmr2 channels are spaced at 50khz interval in to two frequency groups. 50khz spacing between sequential channels minimises adjacent channel inte rference. e.g. 433mhz band serial or parallel channel select frequency (mhz) serial channel select frequency (mhz) 16 433.875 0 (p3:p0 = hhhh)* 433.900 17 433.925 1 433.950 18 433.975 2 434.000 19 434.025 3 434.050 20 434.075 4 434.100 21 434.125 5 434.150 22 434.175 6 434.200 23 434.225 7 434.250 24 434.275 8 434.300 25 434.325 9 434.350 26 434.375 10 434.400 27 434.425 11 434.450 28 434.475 12 434.500 29 434.525 13 434.550 30 434.575 14 434.600 31 434.625 15 (p3:p0=llll)* 434.650 note: parallel select pins: h=3v, l= 0v
radiometrix ltd lmt2/lmr2 data sheet page 8 condensed specifications frequency 433mhz eu band, and 458mhz uk band as supplied: eu version: 433.875 - 434.65mhz (25khz steps) uk version 458.525 - 459.1mhz (25khz steps) other custom uhf bands frequency stability 1.5khz channel spacing 25khz number of channels 16 channels controlled by parallel port or 32 via rs232 interface operating temperature -10 oc to +60 oc (storage -3 0 oc to +70 oc) spurious radiations compliant with etsi en 300 220- 3 and en 301 489-3 transmitter output power +10dbm (10mw) 1db (factory adjustable 1 - 25mw) +20dbm (100mw) 1db (factory adjustable 25 - 100mw) peak deviation 3khz tx on switching time 30ms from txe transition modulation type fsk (f3d) tx modulation bandwidth dc ? 5khz (3v cmos compatib le) adjacent channel tx power <-37dbm tx spurious <-45dbm (no rf output in standby) supply voltage 3.1v ? 15v (1-25mw) 4.1 ? 15v (25 ? 100mw) current 34ma @ 10mw (nominal) 65ma @ 50mw (nominal) 90ma @ 100mw (nominal) <5 a standby (txe high or floating) inputs data (cmos/ttl compatible) size 33 x 23 x 9mm interface user 10 (8) pin 0.1" pitch dual row (5+5) header rf 2pin 0.1? pitch recommended pcb hole size 1.2mm receiver sensitivity -118dbm for 12db sinad s/n ratio 35db (min), 40db (typ) on af output af bandwidth (-3db) 4khz image <-60db othr spurious <-70dbm blocking better than 84db adjacent channel <-60db lo re-radiation -70dbm supply voltage 3.1v ? 15v current 20ma receive <1 a standby (rxe low) outputs rssi, audio, data (quasi dc data recovery c ircuit) size 46 x 23 x 9 mm interface user 10 pin 0.1" pitch dual row (5+5) header rf 2pin 0.1? pitch recommended pcb hole size 1.2mm
radiometrix ltd lmt2/lmr2 data sheet page 9 rx received signal strength indicator (rssi) the lmr2 has wide range rssi that measures the stre ngth of an incoming signal over a range of 60db or more. this allows assessment of link quality and av ailable margin and is useful when performing range tests. the output on pin 5b of the module has a standing d c bias of up to 0.5v with no signal, rising to 2.5v at maximum indication (rf input levels of -40dbm and a bove). ? vmin-max is typically 2v and is largely independent of standing bias variations. output imp edance is 40k . pin 5b can drive a 100 a meter directly, for simple monitoring. 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 -140 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 rf level (dbm) rssi output (v) figure 6: typical rssi level with respect to receiv ed rf level at lmr2 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 conn ected directly to rf pin of the module. optimum total length is 16.4cm (1/4 wave @ 433mhz). keep the open circuit (hot) end well away from metal components to prevent serious de-tu ning. whips are ground plane sensitive and will benefit from internal 1/4 wave e arthed radial(s) if the product is small and plastic cased b) helical wire coil, connected directly to rf pin, open circu it 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 c apacitor to ground at the 'hot' end and fed from rf pin at a point 20% from the ground end. loo ps have high immunity to proximity de- tuning. feature a b c whip helical loop ultimate performance *** ** * easy of design set-up *** ** * size * *** ** immunity proximity effects * ** *** range open ground to similar antenna 500m 200 100
radiometrix ltd lmt2/lmr2 data sheet page 10 the antenna choice and position directly controls t he system range. keep it clear of other metal in th e system, particularly the 'hot' end. the best positi on 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 othe r metal components, particularly large ones like transformers, batteries and pcb tracks/earth plane. the space around the antenna is as important as th e antenna itself. a. helical antenna b. loop antenna rf c1 c2 c4 c3 rf-gnd c. whip antenna 16.4cm rf 0.5 mm enameled copper wire close wound on 3.2 mm diameter former 433 mhz = 24 turns feed point 15% to 25% of total loop length track width = 1mm 4 to 10 cm inside area wire, rod, pcb-track or a combination of these three 433 mhz = 16.4 cm total from rf pin. 2 rf figure 7: antenna types ordering information: part no. description frequency band (mhz) rf power (mw) channel spacing (khz) data rate (kbps) lmt2-433-5 transmitter 433.875-434.650 10 25 5 lmr2-433-5 receiver 433.875-434.650 25 5 lmt2-458-5 transmitter 458.525 - 459.1 100 25 5 lmr2-458-5 receiver 458.525 - 459.1 25 5 lmt2-433-5-12k5 transmitter 433.875-434.650 10 12.5 5 lmr2-433-5-12k5 receiver 433.875-434.650 12.5 5 lmt2-458-5-12k5 transmitter 458.525 - 459.1 100 12 .5 5 lmr2-458-5-12k5 receiver 458.525 - 459.1 12.5 5 lmt2-433-10 transmitter 433.875-434.650 10 25 10 LMR2-433-10 receiver 433.875-434.650 25 10 lmt2-458-10 transmitter 458.525 - 459.1 100 25 10 lmr2-458-10 receiver 458.525 - 459.1 25 10 note : also available on the other uhf band frequencies subject to saw filter availability. e.g. 315, 419, 429, 448, 465mhz etc.
radiometrix ltd hartcran house 231 kenton lane harrow, middlesex ha3 8rp england tel: +44 (0) 20 8909 9595 fax: +44 (0) 20 8909 2233 sales@radiometrix.com www.radiometrix.com copyright notice this product data sheet is the original work and co pyrighted 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 bel ieved 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 lt d does not assume any liability arising from the application or use of any product or circuit descri bed herein, nor for any infringements of patents or other rights of third parties which may result from the u se of its products. this data sheet neither states nor implies warranty of any kind, including fitness for any particular application. these radio devices ma y 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 particula r equipment. further details are available on the office of comm unications (ofcom) web site: http://www.ofcom.org.uk/radiocomms/ifi/ information requests ofcom riverside house 2a southwark bridge road london se1 9ha tel: +44 (0)845 456 3000 or 020 7981 3040 fax: +44 (0)20 7783 4033 information.requests@ofcom.org.uk european radiocommunications office (ero) peblingehus nansensgade 19 dk 1366 copenhagen tel. +45 33896300 fax +45 33896330 ero@ero.dk www.ero.dk

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