BIM3H

EW N Radiometrix Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233 Issue 1, 11 November 2008 BIM3H UHF FM 400mW transceiver module The BIM3H is a miniature PCB mounting UHF radio data transceiver incorporating a received signal strength indicator (RSSI). It allows the simple implementation of data links at speeds up to 10kbps and distances up 5000 metres over open ground. Features • • • • • • • Figure 1: BiM3H-869.50-10 Designed to comply with harmonised radio standard EN 300 220-3 Designed to comply with harmonised EMC standard EN 301 489-3 Data rates up to 10kb/s Usable range up to 5000m Frequency 869.50MHz Fully screened Fast data settling time Available for operation at 869.50MHz in the UK and Europe, the BiM3H combines full screening with internal filtering to ensure EMC compliance by minimising spurious radiation and susceptibility. The module suits one-to-one and multi-node wireless links in applications including car and building security, EPOS and inventory tracking, remote industrial process monitoring and computer networking. Because of the small size and low power requirements, the BIM3H is ideal for use in portable, battery-powered applications such as hand-held terminals. Technical Summary Receiver • Single conversion FM superhet • SAW front end filter gives >50dB image rejection • 5 volt operation • Current consumption 15mA • -108dBm sensitivity @ 1ppm BER • RSSI output with 50dB range • Extremely low LO leakage, -125dBm typical Transmitter • Transmit power: 400mW (26dBm, +/- 1dB) • Operating frequency 869.50MHz • 5 volt operation • Current consumption 310mA (typical) • Data rate: 10 kbps Radiometrix Ltd, BiM3H Data Sheet page 1 Radiometrix Ltd, BiM3H Data Sheet page 2 Figure 2: BiM3H block diagram side view (through can) 10 mm side view (with can) top view (without can) RF GND 1 Antenna 2 RF GND 3 4 5 No pin 6 7 8 9 30.48 mm 33 mm pin pitch: 2.54 mm pins 4, 5, 6, 7 & 8 are not fitted recommended PCB hole size: 1.2 mm module footprint size: 25 x 32 mm 18 17 16 15 14 13 12 11 10 GND Vcc RX ENABLE TX ENABLE 23 mm TXD AF RXD RSSI GND Figure 3: BiM3H Footprint (Top) Pin description RF IN / OUT (pin 2) 50Ω input from the antenna, DC isolated. RF GND (pin 1/3) RF ground pin, internally connected to the module screen . This pin should be connected to the RF return path (coax braid, main PCB ground plane etc.) 0V (pin 9/18/10) DC supply ground. Internally connected to pin 2 and module screen. RSSI (pin 11) Received signal strength indicator with 50dB range. See page 4 for typical characteristics. RXD (pin 12) Digital output from the internal data slicer. The data is a squared version of the signal on pin 13 (AF) and is true data, i.e. as fed to the transmitter. Output is “open-collector” format with internal 10kΩ pull-up to Vcc (pin 17). AF out (pin 13) Buffered and filtered analogue output from the FM demodulator. Standing DC bias 2V approx. External load should be >10kΩ //