Radiometrix Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233 Issue 2, 01 November 2004 BiM2 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 bi-directional wireless connectivity in battery powered or handheld applications Features ! ! ! ! ! ! ! ! ! ! BiM2–433-160 CE Certified by independent Notified Body according to the R&TTE Directive (1999/5/EC) Verified to comply with Radio standard ETSI EN 300 220-3 by UKAS accredited Test Laboratory Verified to comply with EMC standard ETSI EN 301 489-3 by UKAS accredited Test Laboratory Usable range to 200 metres external, 50 metres in building Data rates up to 160kbps SAW controlled 10mW FM transmitter Double conversion FM superhet receiver SAW front end filter and full screening Plug in replacement for Radiometrix BiM-433-40 3V or 5Volt supply at < 20mA 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. 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. 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 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 100µs 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 300-220-3 and fed via a fast antenna changeover switch to the 50Ω 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 Antenna (2) Gnd (18) 2.2µF VTX VRX 10Ω Vcc (17) RX select (16) 433 MHz band pass filter TX/RX switch NC (4) Pre amplifier GND (5) 44 kHz 2nd order LPF Buffer RF GND (3) TX select (15) SAW-stabilised oscillator 418 MHz SAW controlled 1st Local oscillator NC (6) NC (7) TX/RX Supply Switch SAW band pass filter 10kΩ 2nd local oscillator 15.82 MHz 2nd mixer IF amplifier demodulator NC (8) Adaptive Data Slicer TXD (14) AF (13) - AF 35kHz Buffer + Data out (12) VRX CD (11) st 1 mixer Gnd (9) 47kΩ GND (10) Figure 1: Block diagram Pin description: RF GND pin 1 & 3 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.) Antenna pin 2 50Ω RF input from the antenna, it is DC isolated internally. (see antenna for suggested antenna/feeds). 0Volt pins 5, 9, 10, 18 Supply ground connection and screen. CD pin 11 Carrier Detect - When the receiver is enabled, a low indicates a signal above the detection threshold is being received. The output is high impedance (50kΩ) and should only be used to drive a CMOS logic input. RXD pin 12 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 >1kΩ and <1nF Radiometrix Ltd, BiM2 Data Sheet page 2 AF pin 13 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 >2kΩ and <100pF. TXD pin 14 This DC coupled modulation input will accept either serial digital data (0V to Vcc levels) or High level linear signals. Input impedance is 10kΩ. TX select pin 15 Active low transmit select. 10kΩ internal pull up to Vcc. RX select pin 16 Active low receive select. 10kΩ internal pull up to Vcc. Pin 15 TX 1 1 0 0 Pin 16 RX 1 0 1 0 Function power down (<1µA) 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. Vcc pin 17 +ve supply pin. +3.0 to +5.5 volts @ <20mA . The supply must be clean < 20mVP-P ripple. A 2.2µF decoupling capacitor and 10Ω series resistor are used internally to filter the supply. side view side views 4 mm top view RF GND 1 Antenna 2 RF GND 3 NC 4 GND 5 NC 6 NC 7 NC 8 GND 9 BiM2-433-160 0889 ! 30.48 mm 33 mm 18 17 16 15 14 13 12 11 10 0 Volt Vcc RX select TX select TXD AF RXD CD 0 Volt 23 mm recommended PCB hole size: 1.2 mm pin pitch: 2.54 mm Figure 2: Physical dimension Weight: 5g (typical with pins) Radiometrix Ltd, BiM2 Data Sheet page 3 Survival Maximums: Operating temperature: Extended operation at Reduced specification Storage temperature : -10°C to + 55°C -20°C to + 70°C Vcc (pin 17) All other pins Antenna (pin 2) -0.1V to +10.0 V -0.1V to +Vcc+0.6V ±50 V @ <10MHz , +20dBm @ > 10MHz Note: -40°C to + 100°C 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, 100µA source data output low, 100µA sink TX & RX select, high (deselect) low (select) Internal select pull-ups TXD, high low 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 bandwidth Modulation distortion Receiver RF sensitivity, 10dB S/N RF sensitivity, 10dB S/N RF sensitivity, 10dB S/N Radiometrix Ltd, BiM2 Data Sheet pin min. typ. max. units 17 17 17 17 17 17 17 13 12,13 11 4.0 3.0 10 6 12 10 1.0 220 5 3.3 14 8 18 14 1.25 - 5.5 4.0 16 10 21 17 20 1.5 100 - V V mA mA mA mA mVpk-pk V pF kΩ 12 12 - Vcc-0.6 0.4 - V V 15, 16 15, 16 15,16 14 14 Vcc-0.5 0 Vcc-0.5 0 10 Vcc 0.5 Vcc 0.5 V V kΩ V V pin 2 - min. - typ. 50 433.92 max. - units Ω MHz notes TX or RX 2 2 - +7 +3 -50 -100 20 DC DC - +10 +6 0 0 30 - +12 +8 +50 +100 40 32 80 15 dBm dBm kHz kHz kHz kHz kHz % 5V 3.3V -95 -91 -101 -96 -94 2, 13 2, 13 2, 13 dBm dBm dBm notes 3.3V supply 3.3V supply below 1MHz Note 2 RXD high RXD low 160kpbs 3.3V 160kbps page 4 RF Parameters RF sensitivity, 1ppm BER RF sensitivity, 1ppm BER RF sensitivity, 1ppm BER CD threshold , Vcc = 5V CD threshold, Vcc = 3V CD threshold, Vcc = 5V IF bandwidth, Vcc = 5V, 160kbps CD bandwidth Ultimate (S+N)/N, -70dBm input Ultimate (S+N)/N, -70dBm input maximum operating RF input AF output level Initial frequency accuracy pin 2, 12 2, 12 2, 12 2, 11 2, 11 2, 11 2, 11 13 13 2 13 - min. -87 -82 -98 -92 -50 typ. -93 -88 -90 -104 -98 -96 500 400 >40 30 +10 400 0 max. +50 units dBm dBm dBm dBm dBm dBm kHz kHz dB dB dBm mV kHz EMC Parameters pin min. typ. max. units 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 Baseband Transfer Performance TX# RX Linear baseband BW @-3dB Linear baseband BW @-3dB, Balance code bit rate Time between code transitions Time between code transitions Time between code transitions Averaged code mark:space preamble duration 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 Power up to stable data, tPU-data Power up to stable data, tPU-data Radiometrix Ltd, BiM2 Data Sheet notes 5V 3.3V 160kbps Note 2 Note 2 Note 2 Note 2 160kbps peak to peak CD centre notes 402.0MHz DC to 2GHz 2 2 2 2 - -60 -70 -42 -40 - -57 -36 -30 250 dBm dBm dBm dBm kHz worst case pin min. typ. max. units notes 13 13 12 14 14 14 14 14 0.08 0.08 15.6 15.6 6.25 30 3 64 50 - 34 80 1000 120 100 70 - kHz kHz kbps µs µs µs % ms TXD to AF 160kbps 14 14, 12 1 - 15 - ms µs 11 13 12 12 12 - 0.7 0.5 3 1 1 5 1 0.8 ms ms ms ms ms - S version 160kbps in any 2ms 01010101 pattern S version TXD to RXD Note 2 1, S version 160kbps page 5 Baseband Transfer Performance Signal applied with supply on Signal to valid CD, tsig-CD Signal to stable data, tsig-data Signal to stable data, tsig-data Signal to stable data, tsig-data TX power up to full RF Notes: pin min. typ. max. 11 12 12 12 2 - 0.25 3 100 0.5 4 1 0.5 - units notes ms ms ms ms µs Note 2 1, S version 1. from 45% to 55% duty cycle 2. CD works up to a temperature of 40° C 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. 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. Loops have high immunity to proximity de-tuning. C) Whip 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 Ultimate performance Easy of design set-up Size Immunity proximity effects Range open ground to similar antenna A helical ** ** *** ** B loop * * ** *** C whip *** *** * * 200m 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. Radiometrix Ltd, BiM2 Data Sheet page 6 0.5 mm enameled copper wire close wound on 3.2 mm diameter former RF 433 MHz = 24 turns A. Helical antenna Feed point 15% to 25% of total loop length RF-GND track width = 1mm 2 C2 C3 C4 C1 4 to 10 cm inside area RF B. Loop antenna 16.4cm C. Whip antenna wire, rod, PCB-track or a combination of these three RF 433 MHz = 16.4 cm total from RF pin. Figure 3: Antenna Ordering information The standard BiM2, order code BiM2-433-64 is supplied with pins fitted for operation on 5 volt supplies (4 to 5.5v) Versions and Variants BiM2-433-64-3V A 3 volt version is available, BiM-433-64-3V for operation at 3.3volts (3.0 to 4.0 V) it is identical to the standard version but has been tested and aligned for operation at 3.3v. BiM2-433-64-S This is intended for RPC or Manchester code only and has fast settling time (maximum 1ms) Additionally, for volume orders, Radiometrix can supply the BiM2 to the customers’ PCB pin requirements or even without any pins. BiM2-433-160-5V This fast version BiM2 has a raw data rate of up to 160kbps. 3V version also available (BiM2433-160-3V). Radiometrix Ltd, BiM2 Data Sheet page 7 Radiometrix Ltd, BiM2 Data Sheet page 8 Radiometrix Ltd, BiM2 Data Sheet page 9 CE Certificate for BiM2-433-64 and its variants Radiometrix Ltd, BiM2 Data Sheet page 10 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/radiocomms/ifi/licensing/licensing_policy_manual/ 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 [email protected] European Radiocommunications Office (ERO) Peblingehus Nansensgade 19 DK 1366 Copenhagen Tel. +45 33896300 Fax +45 33896330 [email protected] www.ero.dk