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| EW N 433MHz high speed FM radio transceiver module BIM2-433-64 Advanced data is provided to assist in engineering evaluation. The data provided is believed to be accurate but may be subject to change. This is not a specification Radiometrix Issue D, 01 February 2001 433MHz high speed FM radio transceiver module The BiM2 transceiver is an enhanced replacement for our original BiM module. It offers greater transmit power, higher data rates, greatly improved receiver interference rejection and a lower profile. The module is ideal for enabling bidirectional wireless connectivity in battery powered or handheld applications Features Conformity to EN 300-220-1, ETS 300-683 Usable range to 200 metres external, 50 metres in building Data rates to 64kbit/s SAW controlled 10mW FM transmitter Double conversion FM superhet receiver SAW front end filter and full screening Plug in replacement for Radiometrix BiM-433-F 3-5Volt supply at < 20mA BIM2-433-64 The BiM2 is a half duplex radio transceiver module for use in high-speed bi-directional data transfer applications at ranges up to 200metres. The module operates on the European licence exempt frequency of 433.92MHz and conforms to the relevant sections of EN 300-220 and ETS 300-683. The small footprint of 23 x 33mm and low profile of 4mm together with low power requirements of <20mA @ 3 to 5 Volts enable convenient PCB installation. The high raw data rate capability of 64kbit/s and fast state change times will support high data throughput of up to 3 kbyte/s in `streaming' applications or alternatively allows very short air time utilization (TX on < 10 ms) in multi-node scanning networks. Applications * * * * * * * * * PDA's, organizers and laptops Handheld terminals EPOS equipment, barcode scanners, belt clip printers Data loggers Audience response systems In Building environmental monitoring and control High end security and fire alarms Restaurant ordering systems Vehicle data up/download Further information will be available imminently, however, BiM-433-F data sheets contains applications information that is equally applicable to the new BiM2. Radiometrix Ltd, BIM2-433-64 Data Sheet page 1 Functional overview The transmit section of the BiM2 comprises of a SAW stabilised and FM modulated 433.92MHz oscillator feeding a 10mW buffer/output stage. Operation is controlled by a TX select line, the output achieving full power within 100us of this line being pulled low. Modulation is applied at the TXD input and may be either a serial digital stream at the same levels as the module's supply rails (digital drive) or a high level analogue waveform with a pk to pk amplitude close to the modules supply level (linear drive). Modulation shaping is performed internally by a 2nd order 44kHz LPF to minimize spectral spreading. The RF output is filtered to meet the requirements of EN 300-220 and fed via a fast antenna changeover switch to the 50 antenna pin. The receive section of the BiM2 is a double conversion FM superhet with IF's of 16MHz and 150kHz. The dual gate MOSFET LNA is followed by a 750kHz bandwidth SAW filter to provide >60 dB's rejection of all out of band signals. The receiver is controlled by an active low select line and will power up in <1ms. A post-detection 2nd order 35kHz LPF establishes the signal bandwidth and ensures the clean operation of the subsequent adaptive data slicer. The slicer has a 2ms averaging time constant and is optimised for balanced data, e.g. bi-phase codes. A fast acting carrier detect output will indicate the presence of any RF signals. GND (1) VTX VTX VRX 2.2F TX/RX Supply Switch 10 Gnd (18) Vcc (17) RX select (16) Antenna (2) RF GND (3) NC (4) GND (5) NC (6) NC (7) NC (8) 433 MHz band pass filter TX/RX switch Buffer SAW-stabilised oscillator 44 kHz 2nd order LPF TX select (15) TXD (14) 10k Pre amplifier 418 MHz SAW controlled 1st Local oscillator 2nd local oscillator 15.82 MHz AF 35kHz 2 mixer IF amplifier demodulator nd Adaptive Data Slicer + AF (13) Data out (12) SAW band pass filter 1 mixer st Buffer VRX CD (11) GND (10) Gnd (9) 47k Figure 1: Block diagram Pin description: pin 1 & 3 RF GND RF ground pin, internally connected to the module screen and pin 5, 9, 10, 18 (0 Volt). This pin should be connected to the RF return path (e.g. coax braid, main PCB ground plane etc.) pin 2 Antenna 50 RF input from the antenna, it is DC isolated internally. (see antenna for suggested antenna/feeds). pins 5, 9, 10, 18 0Volt Supply ground connection and screen. pin 11 CD Carrier Detect - When the receiver is enabled, a low indicates a signal above the detection threshold is being received. The output is high impedance (50k) and should only be used to drive a CMOS logic input. pin 12 RXD This digital output from the internal data slicer is a squared version of the signal on pin 13 (AF). It may be used to drive external decoders. The data is true data, i.e. as fed to the transmitter. Load impedance should be >1k and <1nF Radiometrix Ltd, BIM2-433-64 Data Sheet page 2 pin 13 AF This is a buffered and filtered analogue output from the FM demodulator. It has a standing DC bias of 1.2 volts and 400mV P-P base band signal. It is useful as a test point or to drive linear decoders. Load impedance should be >2k and <100pF. pin 14 TXD This DC coupled modulation input will accept either serial digital data (0V to Vcc levels) or High level linear signals. Input impedance is 10k. pin 15 TX select Active low transmit select. 10k internal pull up to Vcc. pin 16 RX select Active low receive select. 10k internal pull up to Vcc. Pin 15 TX 1 1 0 0 Pin 16 RX 1 0 1 0 Function power down (<1A) receiver enabled transmitter enabled self test loop back Note: Loop test allows the receivers to monitor the transmitted signal. The receiver will not receive external signals whilst the TX of the module is enabled. pin 17 Vcc +ve supply pin. +3.0 to +5.5 volts @ <20mA . The supply must be clean < 20mVP-P ripple. A 2.2F decoupling capacitor and 10 series resistor are used internally to filter the supply. side view 4 mm side views top view RF GND 1 Antenna 2 RF GND 3 NC 4 GND 5 NC 6 NC 7 NC 8 GND 9 BiM2 433-64 18 17 16 15 14 13 12 11 10 0 Volt Vcc RX select TX select TXD AF RXD CD 0 Volt 23 mm 30.48 mm 33 mm recommended PCB hole size: 1.2 mm pin pitch: 2.54 mm Figure 2: Physical dimension Radiometrix Ltd, BIM2-433-64 Data Sheet page 3 Survival Maximums: Operating temperature: Extended operation at Reduced specification Storage temperature : Vcc (pin 17) All other pins Antenna (pin 2) Note: -10C to + 55C -20C to + 70C -40C to + 100C -0.1V to +10.0 V -0.1V to +Vcc+0.6V 50 V @ <10MHz , +20dBm @ > 10MHz Operation of the BiM2 above 5.5 volt with efficient antenna may result in radiated power levels above the licensed power level. Figures apply to 5V versions unless otherwise noted Temperature 20 C unless noted Electrical Performance DC Levels supply voltage, Vcc (std. version) supply voltage, Vcc (3V version) TX supply current, Vcc (std) TX supply current, Vcc (3.3V) RX supply current, Vcc (std) RX supply current, Vcc (3.3V) supply ripple allowed AF output DC level load capacitance on AF / Data CD output load resistance Interface levels data output high, 100A source data output low, 100A sink TX & RX select, high (deselect) low (select) Internal select pull-ups TXD, high low pin 17 17 17 17 17 17 17 13 12,13 11 min. 4.0 3.0 10 6 12 10 1.0 220 typ. 5 3.3 14 8 18 14 1.25 max. 5.5 4.0 16 10 21 17 20 1.5 100 units V V mA mA mA mA mVpk-pk V pF k notes 5V supply 3.3V supply 5V supply 3.3V supply below1MHz 12 12 15, 16 15, 16 15,16 14 14 Vcc-0.5 0 Vcc-0.5 0 Vcc-0.6 0.4 Vcc 0.5 Vcc 0.5 V V V V k V V RXD high RXD low 10 RF Parameters Antenna pin impedance RF centre frequency Transmitter RF power output, Vcc std RF power output, Vcc 3.3V Initial frequency accuracy Overall frequency accuracy FM deviation Modulation bandwidth Modulation distortion pin 2 - min. - typ. 50 433.92 max. - units MHz notes TX or RX 2 2 - +7 +3 -50 -100 20 DC - +10 +6 0 0 30 - +12 +8 +50 +100 40 32 15 dBm dBm kHz kHz kHz kHz % 5V 3.3V Radiometrix Ltd, BIM2-433-64 Data Sheet page 4 RF Parameters Receiver RF sensitivity, 10dB S/N, 5V RF sensitivity, 10dB S/N, 3.3V RF sensitivity, 1ppm BER, 5V RF sensitivity, 1ppm BER, 3.3V CD threshold, Vcc = 5V CD threshold, Vcc = 3.3V IF bandwidth CD bandwidth Ultimate (S+N)/N, -70dBm input maximum operating RF i/p AF output level Initial frequency accuracy pin 2, 13 2, 13 2, 12 2, 12 2, 11 2, 11 2, 11 13 2 13 - min. -95 -91 -87 -82 -98 -92 -50 typ. -101 -96 -93 -88 -104 -98 500 400 >40 +10 400 0 max. units dBm dBm dBm dBm dBm dBm kHz kHz dB dBm mV kHz notes +50 peak to peak CD centre EMC Parameters pin min. typ. max. units notes Rejections: rejection figures are relative to a 15dB (S+N)/N wanted signal Co-channel rejection 2 -10 dB Image rejection (fRF-2fIF) 2 64 dB Out of band rejection 2 >70 dB AM rejection 2 >30 dB Out of band blocking level 2 >-15 dBm Out of band IP3 2 +1 dBm Radiations RX LO leakage, conducted RX LO leakage, radiated TX 2nd harmonic TX harmonics >1GHz TX spectral bandwidth @-40dBc 402.0MHz DC to 2GHz 2 2 2 2 - -60 -70 -42 -40 - -57 -36 -30 250 dBm dBm dBm dBm kHz worst case Baseband Transfer Performance TX! RX ! Linear baseband BW @-3dB Balance code bit rate Time between code transitions Average code mark:space preamble duration link delay Dynamic Timing Power up with signal present Power up to valid CD, tPU-CD Power up to stable AF, tPU-AF Power up to stable data, tPU-data Signal applied with supply on Signal to valid CD, tsig-CD Signal to stable data, tsig-data TX power up to full RF pin min. typ. max. units notes 13 12 14 14 14 14, 12 0.08 15.6 30 3 - 64 50 15 34 1000 70 - kHz kbit/s s % ms s TXD to AF in any 2ms 01010101 pattern TXD to RXD 11 13 12 - 0.7 0.5 3 1 1 4 ms ms ms 11 12 2 - 0.25 3 100 0.5 5 - ms ms s Radiometrix Ltd, BIM2-433-64 Data Sheet page 5 Antenna requirements Three types of integral antenna are recommended and approved for use with the module: A) Helical Wire coil, connected directly to pin 2, 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. 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. Loops have high immunity to proximity de-tuning. This is a wire, rod ,PCB track or combination connected directly to pin 2 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 A helical ** ** *** ** B loop * * ** *** C whip *** *** * * 200m B) Loop C) Whip Ultimate performance Easy of design set-up Size Immunity proximity effects Range open ground to similar antenna 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 0.5 mm enameled copper wire close wound on 3.2 mm diameter former RF 433 MHz = 24 turns A. Helical antenna RF 2 feed point 15% to 25% of total loop length track width = 1mm 4 to 10 cm inside area RF-GND capacitor = 1.5 to 5 pF variable or fixed B. Loop antenna 15.5cm RF wire, rod, PCB-track or a combination of these three 433 MHz = 15.5 cm total from antenna pin 2. C. Whip antenna Radiometrix Ltd, BIM2-433-64 Data Sheet page 6 Radiometrix Ltd 4 Hartcran House Gibbs Couch Watford WD19 5EZ ENGLAND Tel: 020 8428 1220 Fax:020 8428 1221 Int ": +44 20 8428 1220 www.radiometrix.co.uk info@radiometrix.co.uk 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. Radio and EMC regulations The Intrastat commodity code for all our modules is: 8542 4090. The purchaser of Radiometrix subassemblies must satisfy all relevant EMC and other regulations applicable to their finished products. 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 Radiocommunications Agency (RA) web site: www.radio.gov.uk/document/libind.htm#emc The Information and Library Service Radiocommunications Agency Wyndham House, Marsh Wall London E14 9SX United Kingdom Tel: +44 (0)20 7211 0502 or 0505 Fax: +44 (0)20 7211 0507 E-mail: library.ra@gtnet.gov.uk (End of BIM2-433-64 Advanced Engineering Data) Radiometrix Ltd, BIM2-433-64 Data Sheet page 7 |
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