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radiometrix ltd, bim2/3g data sheet page 1 features data rates up to 128 kbps usable range up to 300 m versions available on 433.92mhz, 434.42mhz and 868m hz band fully screened low profile with small footprint designed for compliance with en 300 220-3 (radio) a nd en 301 489-3 (emc) standards available for operation at 433.92mhz, 434.42mhz and 868mhz band in the uk and europe, these modules combine full screening with extensive internal filt ering to ensure emc compliance by minimising spurio us radiations and susceptibilities. the bim2/3g module will suit one-to-one and multi-node wireless links in applications. because of their small size and low p ower requirements, the module is ideal for use in p ortable, battery-powered applications such as hand-held term inals. applications data loggers epos equipment, barcode scanners, belt clip printer s audience response systems in-building environmental monitoring and control security and fire alarms restaurant ordering systems vehicle data up/download technical summary crystal-locked pll, fm modulated at up to 128 kbps +10dbm on 433.92mhz and 868mhz (dependent on versio n) high efficiency, >30%, dc to rf 2nd harmonic, > -60dbc single conversion fm superhet receiver saw front end filter gives >50db image rejection sensitivity: -102dbm sensitivity @ 1ppm ber, 64kbps version -108dbm sensitivity @ 1ppm ber, 1 5kbps version tba dbm sensitivity @ 1ppm ber, 128kbps version rssi output with 60db range extremely low lo leakage, -125dbm typical supply: +5v ( 10%) current consumption: 10ma (typ.) size: 33 x 23 x 5mm evaluation platforms : universal evaluation kit, nbek + dil carrier the bim2/3g data radio module is a pll synthesiser based miniature pcb mounting u hf radio transceiver which enable the simple implementation of a wireless data link at up to 128 kbps at distances up to 75 metres in- building and 300 metres open ground. 433 / 868mhz fm data transceiver issue 1, 27 july 2012 hartcr an house, 231 kenton lane, harrow, middlesex, ha3 8 rp, england tel: +44 (0) 20 8909 9595, fax: +44 (0) 20 8909 223 3, www.radiometrix.com bim2/bim3g figure 1: bim2g - 869 - 64 - 5v
radiometrix ltd, bim2/3g data sheet page 2 functional overview the transmit section of the bim2/3g consists of a f requency modulated crystal locked pll feeding a buf fer amplifier and rf filter. a tx select line controls operation. the transmitter achieves full rf output typically within 1ms of this line being pulled low. modulatio n is applied at the txd input and may be either a s erial digital stream toggling between 0v and 5v (digital drive) o r a high level analogue waveform with the same peak limits (linear drive). modulation shaping is performed int ernally by a 2nd order lowpass filter, which minimi ses spectral spreading. the rf output is filtered to ensure comp liance with the appropriate regulations and fed via a tx/rx changeover switch to the antenna pin. the receive section is a single conversion fm super het with an if of 10.7mhz. a saw bandpass filter in the receiver front-end provides image rejection and sup pression of other unwanted out-of-band signals. lik e the transmitter, the receiver is controlled by its own active low rx select line. a post-detection lowpass filter establishes the signal bandwidth and ensures clean operation of the subsequent adaptive data slicer. t he slicer is optimised for balanced data such as bi-phase cod e. a received signal strength (rssi) output with 60 db of range is provided. a version of bim2/3g featuring a fast acting carrier detect (cd) output on the same rssi pin is also available. the cd output will indicate the presence of any rf signals on the carrier frequ ency. 18 17 16 15 14 13 12 11 10 0v vcc rx select txd tx select af rxd rssi/cd 0v 12 3 4 5 6 7 8 9 rf gnd antenna rf gnd 0v no pin 33 mm 30.48 mm 23 mm 5 mm side view (through can) top view (without can) side view (with can) recommended pcb hole size: 1.2 mm module footprint size: 25 x 32 mm pin pitch: 2.54 mm (0.1") pins 4, 5, 6, 7 are not fitted & 8 fig. 2: physical dimensions pin description rf gnd pins 1 & 3 rf ground pins, internally connected to the module screen and to pins 9, 10 & 18 (0v). these pins shou ld be connected directly to the rf return path (e.g. coax braid, main pcb ground plane etc). antenna pin 2 50 rf connection to the antenna, dc-isolated. see pag es 7 & 8 for details of suitable antennas and feeds . 0v (gnd ) pins 9, 10 & 18 supply ground connection and screen. rssi /cd pin 11 rssi variant : received signal strength indicator with 60db rang e, operational when rx is enabled. output voltage nominally 0.50vdc (no signal), 1.0vdc (maxi mum strength). see page.6 for typical characteristi cs. carrier detect variant : when the receiver is enabled, a low indicates a s ignal above the detection threshold is being received. the output is high impedance and sh ould only be used to drive a cmos logic input.
radiometrix ltd, bim2/3g data sheet page 3 rxd pin 12 digital output from internal data slicer. the outpu t is a squared version of the signal on pin 13 (af) and may be used to drive a decoder directly. the data is true data, i.e. as fed to the transmitter. output is ?op en-collector? format with internal 10k pullup to vcc (pin 17). af pin 13 buffered & filtered analogue output from fm demodul ator. standing dc bias of 1v approx. useful for tes t purposes or for driving external decoders. external load should be >10k // <100pf txd pin 14 this dc-coupled transmitter modulation input will a ccept either serial digital data or high level line ar signals. drive signal must be limited to 0v min, 5v max. see page 7 for suggested drive methods. input impedanc e >50k . tx select pin 15 active-low transmit select. 47k internal pull-up to vcc. rx select pin 16 active-low receive select. 47k internal pull-up to vcc. pin 15 tx pin 16 rx function 1 1 power down (<10 a) 1 0 receiver enabled 0 1 transmitter enabled 0 0 self test loop-back* * loop-back allows the receiver to monitor the tran smitted signal. under these conditions the tx radia ted signal level will be reduced to approximately -10dbm). vcc pin 17 +5v dc +ve supply pin. the supply should be clean, <20mvp-p ripple.
radiometrix ltd, bim2/3g data sheet page 4 absolute maximum ratings exceeding the values below may cause permanent dama ge to the module. operating temperature -20c to +70c storage temperature -40c to +100c vcc (pin 17) -0.3v to +16v(dependant on version ) tx, rx select (pins 15, 16) -9v to +5.5v all other pins -0.3v to +vcc antenna (pin 2) 50v dc, +10dbm rf performance specifications figures apply to standard version @ vcc=5.0v, tempe rature +20c, unless stated. general pin min. typ. max. units notes supply voltage 17 4.5 5.0 5.5 v note 9 tx supply current 17 - 14 - ma note 9 rx supply current 17 10 11 17 ma note 1 rf centre frequency - - - mhz note 9 antenna port impedance 2 - 50 - tx or rx tx & rx select: high (deselect) 15, 16 vcc-0.5 vcc v low (select) 15, 16 0 0.5 v internal select pull-ups 15,16 - 47 - k to vcc (pin 17) balanced code bit rate 12 - - 128 kbps -128 version balanced code bit rate 12 - - 64 kbps -64 version balanced code bit rate 12 - - 15 kbps -15 version transmitter section pin min. typ. max. units notes rf power output 2 - +10 - dbm note 9 tx harmonics/spurious emission 2 - -55 -40 dbm initial centre frequency accuracy - -10 0 +10 khz fm deviation - 20 27 35 khz peak modulation bandwidth - 0 - 65 khz @ -3db modulation distortion - - 5 10 % note 2 tx spectral bandwidth @ -40dbc 2 - - 250 khz worst case txd input level: high 14 2.8 5 v note 3 low 14 0 - 0.2 v note 3 tx power up to full rf 2 - 1 1.5 ms note 4 receiver section pin min. typ. max. units notes rf sensitivity, 10db s/n 2, 13 - -113 - dbm rf sensitivity, 1ppm ber 2, 12 - -tba - dbm -128 ve rsion rf sensitivity, 1ppm ber 2, 12 - -102 - dbm -64 ver sion rf sensitivity, 1ppm ber 2, 12 - -108 - dbm -15 ver sion rssi range 2, 11 - 60 - db if bandwidth - - 180 - khz image rejection (f rf -21.4mhz) 2 50 54 - db if rejection (10.7mhz) 2 100 - - db local osc. leakage, conducted 2 - -125 -110 dbm baseband bandwidth @ -3db 13 0 - 65 khz -128 versio n baseband bandwidth @ -3db 13 0 - 50 khz -64 version baseband bandwidth @ -3db 13 0 - 7.8 khz -15 versio n af output signal level 13 200 250 350 mv p-p note 5 dc offset on af output 13 1.5 2.0 2.5 v note 6 distortion on recovered af 13 - 1 5 % note 7 load capacitance, af & rxd 12, 13 - - 100 pf
radiometrix ltd, bim2/3g data sheet page 5 receiver section pin min. typ. max. units notes dynamic timing rx power up with signal present power up to valid rssi, t pu - rssi 11 - 0.5 1 ms power up to stable data, t pu - data 12 - 2 10 ms -15 version power up to stable data, t pu - data 12 - 2 10 ms -64 version signal applied with rx on rssi response time (rise/fall) 11 - 100 - s signal to stable data, t sig - data 12 - 0.5 1 ms -15 version signal to stable data, t sig - data 12 - 0.2 0.5 ms -64 version time between data transitions 14 70 - 5000 s -15 version time between data transitions 14 15.6 - 1500 s -64 version averaged code mark:space 14 20 50 80 % note 8 note : 1. increases at high rf input level (>-20dbm) 2. see page 6 for further details 3. for specified fm deviation 4. tx select low > full rf output 5. 30khz fm deviation ?15 and ?64 versions on;y 6. min/max at 50khz offset 7. max at 50khz offset 8. average, at max. data rate 9. dependant on version power supply requirement the power supply ripple/noise should be below 10mvp -p to avoid problems. if the quality of the supply is in doubt, it is recommended that a 10 f low-esr tantalum or similar capacitor be added be tween the module supply pin (vcc) and ground, together with a 10 series feed resistor between the vcc pin and the s upply rail. the bim2/3g incorporates a low voltage shutoff circ uit, which prevents any possibility of erratic oper ation by disabling the rf output of the transmitter if the s upply voltage drops below 2.2v (5%). this feature is self- resetting, i.e. restoring the supply to greater tha n 2.2v will immediately restore full rf output from the module. the standard bim2/3g requires a regulated 5v supply with ripple content <100mvpk-pk. received signal strength indicator (rssi) the bim2/3g module incorporates a wide range rssi w hich measures the strength of an incoming signal ov er a range of approximately 60db. this allows assessme nt of link quality and available margin and is usef ul when performing range tests. please note that the actual rssi voltage at any giv en rf input level varies somewhat between units. th e rssi facility is intended as a relative indicator only - it is not designed to be, or suitable as, an accur ate and repeatable measure of absolute signal level or tran smitter-receiver distance. the output on pin 5 of the module has a standing dc bias in the region of 0.5v with no signal, rising to around 1v at maximum indication. the rssi output source im pedance is high (~100k ) and external loading should therefore be kept to a minimum. to ensure a fast response the rssi has limited inte rnal decoupling of 1nf to ground. this may result i n a small amount of ripple on the dc output at pin 5 of the m odule. if this is a problem further decoupling may be added at the expense of response speed, in the form of a capacitor from pin 5 to ground. for example, adding 10nf here will increase rssi response time from 100s to around 1ms. the value of this capacitor may be inc reased without limit.
radiometrix ltd, bim2/3g data sheet page 6 typical rssi characteristic is shown below (this is for indicative purposes only and is not a guarante e of actual rssi characteristics): 200 300 400 500 600 700 800 900 1000 1100 -130 -120 -110 -100 -90 -80 -70 -60 -50 rf input level (dbm) rssi voltage module mounting considerations good rf layout practice should be observed ? in par ticular, any ground return required by the antenna or feed should be connected directly to the rf gnd pin at t he antenna end of the module, and not to the ov pin which is intended as a dc ground only. all connecting tra cks should be kept as short as possible to avoid an y problems with stray rf pickup. if the connection between module and antenna does n ot form part of the antenna itself, it should be ma de using 50 microstrip line or coax or a combination of both. it is desirable (but not essential) to fill all unu sed pcb area around the module with ground plane. the module may be potted if required in a viscous c ompound which cannot enter the screen can . warning: do not wash the module. it is not hermetically se aled. figure 3: typical rssi response
radiometrix ltd, bim2/3g data sheet page 7 application information modulation formats and range extension the module will produce the specified fm deviation with a 2-level digital input to txd which toggles b etween 0v and 5v. reducing the amplitude of the data input from this value reduces the transmitted fm deviati on, typically to 20-22khz minimum at 0 - 2.8v. the rec eiver will cope with this quite happily and no sign ificant degradation of link performance should be observed. txd is normally driven directly by logic levels but will also accept analogue drive, e.g. 2-tone signa lling. in this case it is recommended that txd (pin 14) should be dc-biased to 1.5v with the modulation ac-coupled an d limited to a maximum of 3v peak-to-peak. the instan taneous modulation voltage must not swing below 0v or above 3v at any time if waveform distortion and exc essive fm deviation is to be avoided ? use a resist ive potential divider and/or level shifter to accomplis h this if necessary. the varactor modulator in the transmitter introduces some 2nd harmonic distortion which may b e reduced if necessary by predistortion of the anal ogue waveform. at the other end of the link the af output (pin 13) can be used to drive an external decoder directly. although the module baseband response extends down to dc, data formats containing a dc component are unsuitable and should not be used. this is because frequency errors and drifts between the transmitter and receiver occur in normal operation resulting in dc offset errors on the af output. the time constant of the adaptive data slicer in th e bim2/3g is set at a reasonable compromise to allo w the use of low code speeds where necessary whilst keeping s ettling times acceptably fast for battery-economise d operation. rxd output on pin 12 is ?true? sense, i. e. as originally fed to the transmitter. antenna considerations and options the choice and positioning of transmitter and recei ver antennas is of the utmost importance and is the single most significant factor in determining system range . the following notes are intended to assist the us er in choosing the most effective arrangement for a given application. nearby conducting objects such as a pcb or battery can cause detuning or screening of the antenna whic h severely reduces efficiency. ideally the antenna sh ould stick out from the top of the product and be e ntirely in the clear, however this is often not desirable for practical or ergonomic reasons and a compromise may need to be reached. if an internal antenna must be used, tr y to keep it away from other metal components and p ay particular attention to the ?hot? end (i.e. the far end), as this is generally the most susceptible to detuning. the space around the antenna is as important as the ant enna itself. microprocessors and microcontrollers tend to radiat e significant amounts of radio frequency hash, whic h can cause desensitisation of the receiver if its antenn a is in close proximity. 433mhz is generally less p rone to this effect than lower frequencies, but problems can sti ll arise. things become worse as logic speeds incre ase, because fast logic edges are capable of generating harmonics across the uhf range which are then radia ted effectively by the pcb tracking. in extreme cases s ystem range can be reduced by a factor of 3 or more . to minimise any adverse effects, situate the antenna a nd module as far as possible from any such circuitr y and keep pcb track lengths to the minimum possible. a g round plane can be highly effective in cutting radi ated interference and its use is strongly recommended. a simple test for interference is to monitor the re ceiver rssi output voltage, which should be the sam e regardless of whether the microcontroller or other logic circuitry is running or in reset.
radiometrix ltd, bim2/3g data sheet page 8 three types of integral antenna are recommended: a) helical wire coil, connected directly to pin 2, 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. b) loop a loop of pcb track tuned by a fixed or variable capacitor to ground at the 'hot' end and fed from pin 2 at a point 20% from the ground end. loop s have high immunity to proximity de- tuning. c) whip this is a wire, rod, pcb track or combination conn ected directly to pin 2 of the module. optimum total length is 15.5cm (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 earthed rad ial(s) if the product is small and plastic cased 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 helical loop whip ultimate performance ** * *** easy of design set-up ** * *** size *** ** * immunity proximity effects ** *** * range open ground to similar antenna (for bim2g-433-15) 200m 100m 300m fig.4: antenna configuration (bim2g @ 433.92mhz) antenna selection chart
radiometrix ltd, bim2/3g data sheet page 9 duty cycle requirements the duty cycle is defined as the ratio, expressed a s a percentage, of the maximum transmitter ?on? tim e on one or more carrier frequencies, relative to a one hour period. where an acknowledgement message is requir ed, the additional transmitter ?on? time shall be inclu ded. there is a 10% duty cycle restriction on 433.050-43 4.790 mhz band in most of the eu member states. the bim2g is a rf module intended to be incorporate d into a wide variety of applications and finished products, radiometrix has no control over the end u se of the bim2g.the harmonised band 433.050 to 434. 790 mhz as detailed in annex 1 band e of cept/erc recom mendation 70-03 (which can be downloaded at http://www.ero.dk/scripts/docmanag98/dm.dll/querydo c?cat=recommendation) has list of countries where duty cycle restriction apply. module users should, therefore, ensure that they co mply with the stated duty cycle requirements of the version of cept/erc recommendation 70-03 in place at the ti me of incorporation of the bim2g into their product . please refer to appendix a for duty cycle informati on on 868mhz band in which the bim3g operates. variants and ordering information the following variants are standard: part number rf power (dbm) data rate (kbps) frequency (mhz) rssi versions bim2g-433-15-5v +10 15 433.92 bim2g-433-64-5v +10 64 433.92 bim2g-433-128-5v +10 128 433.92 bim2g-434-15-5v +10 15 434.42 bim2g-434-64-5v +10 64 434.42 bim2g-434-128-5v +10 128 434.42 bim3g-869-15-5v +5 15 869.85mhz bim3g-869-64-5v +5 64 869.85mhz bim3g-869-128-5v +5 128 869.85mhz bim3g-868-15-5v +10 15 868.3mhz bim3g-868-64-5v +10 64 868.3mhz bim3g-868-128-5v +10 128 868.3mhz cd versions bim2g-433-15-cd-5v +10 15 433.92 bim2g-433-64-cd-5v +10 64 433.92 bim2g-433-128-cd-5v +10 128 433.92 bim2g-434-15-cd-5v +10 15 434.42 bim2g-434-64-cd-5v +10 64 434.42 bim2g-434-128-cd-5v +10 128 434.42 bim3g-869-15-cd-5v +5 15 869.85mhz bim3g-869-64-cd-5v +5 64 869.85mhz bim3g-869-128-cd-5v +5 128 869.85mhz bim3g-868-15-cd-5v +10 15 868.3mhz bim3g-868-64-cd-5v +10 64 868.3mhz bim3g-868-128-cd-5v +10 128 868.3mhz for other frequency variants, please contact sales department. evaluation platforms: 1. universal evaluation kit 2. nbek + bim carrier
radiometrix ltd, bim2/3g data sheet page 10 appendix a [mw] [mhz] rf power [erp] 10 100 500 600khz 500khz 250khz 300khz 25mw 25mw cept/erc rec 70-03, 868 mhz band plan applications channel spacing duty cycle 5mw 500mw 10mw 100khz 868.0 868.60 868.70 869.20 869.25 869.30 869.65 869.40 870.0 869.70 <1% or lbt no spacing non-specific srd non-specific srd non-specific srd no spacing up to 100% <0.1% or lbt <1% <10% or lbt <10% no spacing 25khz or wide band 25khz alarm alarm <1% 25khz or wb alarm social alarm 10mw 25khz <0.1% 100khz 25mw 10mw 50khz 50khz 10mw non-specific srd 25khz 50khz
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/ 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 information.requests@ofcom.org.uk european communications office (eco) peblingehus nansensgade 19 dk 1366 copenhagen tel. +45 33896300 fax +45 33896330 ero@ero.dk www.ero.dk

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