BIM3B-869.85-64

Hartcran House, 231 Kenton Lane, Harrow, Middlesex, HA3 8RP, England Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233, www.radiometrix.com Issue 2, 27 July 2012 BiM3B 886699MMHHzz // 991155MMHHzz WWiiddee BBaanndd FFMM rraaddiioo 88 6699MMHHzz // 991155MMHHzz WWiiddee BBaanndd FFMM rraaddiioo The BiM3B radio transceiver module is an enhanced high power replacement for the Canadian, European and US version BiM3A. Two frequency variants are available in the European unlicensed band, one with 5mW RF power with no duty cycle restriction other with 25mW RF power with 1% duty cycle restriction. Figure 1: BiM3B-868.30-64 Features Complies with European harmonised standards EN 300 220 and EN 301 489 Complies with US FCC Part 15.249 and Canadian IC RSS-210 RF power output: +14dBm (25mW) on 868.30MHz (EU) with <1% duty cycle restriction +7dBm (5mW) on 869.85MHz (EU) with no duty cycle restriction -1.25dBm (0.75mW) on 914.50MHz (USA, Canada) Data rates: up to 10kbps or 64kbps Crystal controlled PLL FM circuitry for both Tx and Rx SAW front end filter and full screening Receiver Sensitivity: -101dBm for 1ppm BER (64kbps) o -104dBm for 1ppm BER (10kbps) Supply: 2.9V - 16V 35mA Tx (25mW), 17mA TX (5mW), 11mA Rx Usable range up to 300 metres external, 75 metres in building Received Signal Strength Indicator (RSSI) Analogue and digital baseband Low profile with small footprint 33 x 23 x 5mm Applications PDAs, organisers and laptops Handheld terminals EPOS equipment, barcode scanners, belt clip printers Data loggers Audience response systems In-building environmental monitoring and control Security and fire alarms Restaurant ordering systems Vehicle data up/download Evaluation platforms: Uni-Eval, NBEK + BiM / SMX carrier Radiometrix Ltd, BiM3B Data Sheet page 1 Functional overview The transmit section of the BiM3B consists of a frequency modulated crystal locked PLL feeding a buffer 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. Modulation is applied at the TXD input and may be either a serial digital stream toggling between 0V and 3V (digital drive) or a high level analogue waveform with the same peak limits (linear drive). Modulation shaping is performed internally by a 2nd order lowpass filter, which minimises spectral spreading. The RF output is filtered to ensure compliance with the appropriate regulations and fed via a Tx/Rx changeover switch to the antenna pin. The receive section is a single conversion FM superhet with an IF of 10.7MHz. A SAW bandpass filter in the receiver front-end provides image rejection and suppression of other unwanted out-of-band signals. Like 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. The slicer is optimised for balanced data such as bi-phase code. A received signal strength (RSSI) output with 60dB of range is provided. matching ref & lpf PA 64 osc V C O Loop 35kHz LPF Filter TXD Vcc 2.9 - 16V ref Tx/Rx switch 32 osc Tx select Regulator Antenna & Tx/Rx logic Rx select Loop Filter V C O RSSI 869MHz LPF data IF Amp RXD BPF preamp slicer Demod Mixer 10.7MHz AF Fig. 2: Block diagram Pin description RF GND pins 1 & 3 RF ground pins, internally connected to the module screen and to pins 5, 9, 10 & 18 (0V). These pins should 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 pages 7 & 8 for details of suitable antennas and feeds. 0V (GND) pins 5, 9, 10 & 18 Supply ground connection and screen. RSSI pin 11 Received Signal Strength Indicator with 60dB range, operational when Rx is enabled. Output voltage nominally 0.15 - 0.40Vdc (no signal), 1.40Vdc (maximum). See page.6 for typical characteristics. Radiometrix Ltd, BiM3B Data Sheet page 2